Release v3.9.3

* correct thread handling in ButtonDelay

Discovered in #390 for devices with API Level 25. Not fixing the whole issue, but a first step.

* fix #390 crash when stopping for older devices

The VectorDrawable ic_button_stop.xml referenced from withing the AnimatedVectorDrawable ic_button_stop_anim.xml was a problem for older devices. Now the VectorDrawable is expanded (duplicated) inside the AnimatedVectorDrawable. Now it is working. Even with the animation.

.github/FUNDING.yml

@@ -1,4 +1,4 @@
 # These are supported funding model platforms
 
-liberapay: dennis.guse
+liberapay: OpenTracks
 custom: https://play.google.com/store/apps/details?id=de.dennisguse.opentracks.playstore

.github/PULL_REQUEST_TEMPLATE.md

@@ -8,3 +8,6 @@ A clear and concise description of what the pull request changes/adds.
 
 **License agreement**
 By opening this pull request, you are providing your contribution under the _Apache License 2.0_ (see [LICENSE.md](LICENSE.md)).
+
+**Note: new dependencies/libraries**
+Please refrain from introducing new libraries without consulting the team.

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "gradle"
+    directory: "/"
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,34 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: '0 6 * * 1'
+
+jobs:
+  analyse:
+    name: Analyse
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 2
+
+    - run: git checkout HEAD^2
+      if: ${{ github.event_name == 'pull_request' }}
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: java
+
+    - run: |
+       ./gradlew build
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.gitignore

@@ -66,6 +66,9 @@ captures/
 .idea/sqlDataSources.xml
 .idea/vcs.xml
 .idea/uiDesigner.xml
+.idea/jarRepositories.xml
+.idea/markdown-navigator-enh.xml
+.idea/markdown-navigator.xml
 
 # Keystore files
 *.jks

README.md

@@ -21,7 +21,7 @@ _OpenTracks_ is a sport tracking application that completely respects your priva
             </a>
         </td>
         <td>
-            <a href="https://liberapay.com/dennis.guse/donate">
+            <a href="https://liberapay.com/OpenTracks/donate">
                 <img alt="Donate using Liberapay" src="https://liberapay.com/assets/widgets/donate.svg" height="45" align="middle">
             </a>
         </td>

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.0'
+        classpath 'com.android.tools.build:gradle:4.0.1'
     }
 }
 
@@ -37,6 +37,8 @@ def getVersionName = { ->
 
 android {
     compileOptions {
+        coreLibraryDesugaringEnabled true
+
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
@@ -45,13 +47,8 @@ android {
 
     defaultConfig {
         applicationId "de.dennisguse.opentracks"
-        manifestPlaceholders = [
+        versionCode 3544
-                applicationLogo: "@mipmap/ic_launcher",
+        versionName "v3.9.3"
-                applicationName: "@string/app_name"
-        ]
-
-        versionCode 3466
-        versionName "v3.8.0"
 
         buildConfigField "String", "VERSION_NAME_FULL", "\"${getVersionName()}\""
 
@@ -67,10 +64,6 @@ android {
         debug {
             applicationIdSuffix ".debug"
             versionNameSuffix "-debug"
-            manifestPlaceholders = [
-                    applicationLogo: "@mipmap/ic_launcher_debug",
-                    applicationName: "OpenTracks (Debug)"
-            ]
         }
 
         release {
@@ -89,20 +82,17 @@ android {
 }
 
 dependencies {
-    implementation 'androidx.appcompat:appcompat:1.1.0'
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.0.10'
+
+    implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'androidx.preference:preference:1.1.1'
     implementation 'androidx.documentfile:documentfile:1.0.1'
-    implementation 'com.google.android.material:material:1.1.0'
+    implementation 'com.google.android.material:material:1.2.0'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    implementation 'com.android.support.constraint:constraint-layout:2.0.1'
 
-    androidTestImplementation 'androidx.test:core:1.2.0'
+    androidTestImplementation 'androidx.test:core:1.3.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
-    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.2.0'
+    androidTestImplementation 'androidx.test:rules:1.3.0'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test:runner:1.3.0'
-    androidTestImplementation 'androidx.test:rules:1.2.0'
+    androidTestImplementation 'org.mockito:mockito-android:3.4.6'
-    androidTestImplementation 'androidx.test:runner:1.2.0'
-    androidTestImplementation 'org.mockito:mockito-android:3.0.0'
-
-    testImplementation 'androidx.test:core:1.2.0'
-    testImplementation 'org.mockito:mockito-core:3.0.0'
 }

doc/data-exportimport.txt

@@ -0,0 +1,29 @@
+@startuml
+interface TrackExporter {
+}
+class KmzTrackExporter implements TrackExporter
+KmzTrackExporter o-- FileTrackExporter
+class FileTrackExporter implements TrackExporter {
+/' One track only '/
+}
+FileTrackExporter o-- TrackWriter
+
+interface TrackWriter {
+}
+class GpxTrackWriter implements TrackWriter
+class KmlTrackWriter implements TrackWriter
+
+
+interface TrackImporter {
+}
+class KmzTrackImporter implements TrackImporter {
+}
+KmzTrackImporter o-- KmlFileTrackImporter
+class AbstractFileTrackImporter implements TrackImporter {
+}
+class GpxFileTrackImporter extends AbstractFileTrackImporter {
+}
+class KmlFileTrackImporter extends AbstractFileTrackImporter {
+/' Supports multiple tracks via folders '/
+}
+@enduml

doc/opentracks-schema-1.0.xsd

@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
+    targetNamespace="http://opentracksapp.com/xmlschemas/v1">
+
+    <xs:element name="trackuuid"
+        type="xs:string" />
+
+</xs:schema>

drawable-svg/ic_activity_climbing.svg

@@ -0,0 +1,474 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
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+   sodipodi:docname="ic_activity_climbing.svg"
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+   id="svg8"
+   version="1.1"
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+   width="22">
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+    <path
+       sodipodi:nodetypes="cccccccccccccc"
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+       style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:medium;line-height:normal;font-family:sans-serif;font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:normal;word-spacing:normal;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;vector-effect:none;fill:#ffffff;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.304444px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate;stop-color:#000000;stop-opacity:1"
+       id="path894-3" />
+  </g>
+</svg>

drawable-svg/ic_bluetooth_searching.svg

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/"
+    xmlns:cc="http://creativecommons.org/ns#"
+    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+    xmlns="http://www.w3.org/2000/svg"
+    id="svg6"
+    version="1.1"
+    height="24px"
+    width="24px"
+    fill="black"
+    viewBox="0 0 24 24">
+    <metadata id="metadata12">
+        <rdf:RDF>
+            <cc:Work rdf:about="">
+                <dc:format>image/svg+xml</dc:format>
+                <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+            </cc:Work>
+        </rdf:RDF>
+    </metadata>
+    <path
+        id="dotSmall"
+        d="m 14.24,12.01 2.32,2.32 C 16.84,13.61 17,12.82 17,12 17,11.18 16.84,10.41 16.57,9.69 Z" />
+    <path
+        id="dotBig"
+        d="m 19.53,6.71 -1.26,1.26 c 0.63,1.21 0.98,2.57 0.98,4.02 0,1.45 -0.36,2.82 -0.98,4.02 l 1.2,1.2 C 20.44,15.67 21.01,13.85 21.01,11.9 21,10.01 20.46,8.23 19.53,6.71 Z" />
+    <path
+        d="M 12.88,16.29 11,18.17 V 14.41 Z M 11,5.83 12.88,7.71 11,9.59 Z M 15.71,7.71 10,2 H 9 V 9.59 L 4.41,5 3,6.41 8.59,12 3,17.59 4.41,19 9,14.41 V 22 h 1 L 15.71,16.29 11.41,12 Z"
+        id="path4" />
+</svg>

fastlane/metadata/android/en-US/changelogs/3474.txt

@@ -0,0 +1,8 @@
+v3.8.1: OpenTracks
+
+Changes:
+- While recording: add option for fullscreen
+- Dashboard is started on the same task
+
+Bugfixes:
+- Intent filters for importing files were far too optimistic

fastlane/metadata/android/en-US/changelogs/3522.txt

@@ -0,0 +1,14 @@
+v3.9.0: OpenTracks
+
+Changes:
+- Export tracks with their UUID
+- Prevent import of already existing tracks by UUID (configurable; default yes)
+- Pause/stop button now require long press
+- GPS pre-start shows status of fix
+- Added new activity icons
+- Speed sensor: wheelsize now configurable in millimeter
+
+Bugfixes:
+- Fixed some rare crashes (NPE)
+- Pace formatting corrected
+- App icon in launcher repositioned

fastlane/metadata/android/en-US/changelogs/3530.txt

@@ -0,0 +1,4 @@
+v3.9.1: OpenTracks
+
+Bugfixes:
+- GPS pre-start shows status of fix

fastlane/metadata/android/en-US/changelogs/3541.txt

@@ -0,0 +1,5 @@
+v3.9.2: OpenTracks
+
+Bugfixes:
+- Fixed force close on API<25 (due to an animation)
+- Reset recording state (on app startup) if crashed while recording

fastlane/metadata/android/en-US/changelogs/3544.txt

@@ -0,0 +1,4 @@
+v3.9.3: OpenTracks
+
+Bugfixes:
+- Fixed export all tracks bug.

src/androidTest/java/de/dennisguse/opentracks/content/DescriptionGeneratorTest.java

@@ -67,7 +67,7 @@ public class DescriptionGeneratorTest {
         track.setTrackStatistics(stats);
         track.setCategory("hiking");
         String expected = //"Created by"
-                "<a href='https://github.com/OpenTracksApp/OpenTracks'>OpenTracks</a><p>"
+                "<a href='https://github.com/OpenTracksApp/OpenTracks'>OpenTracks (Debug)</a><p>"
                 + "Name: -<br>"
                 + "Activity type: hiking<br>"
                 + "Description: -<br>"
@@ -103,7 +103,7 @@ public class DescriptionGeneratorTest {
         track.setTrackStatistics(stats);
         track.setCategory("hiking");
         String expected = //"Created by"
-                "<a href='https://github.com/OpenTracksApp/OpenTracks'>OpenTracks</a><p>"
+                "<a href='https://github.com/OpenTracksApp/OpenTracks'>OpenTracks (Debug)</a><p>"
                         + "Name: -<br>"
                         + "Activity type: hiking<br>"
                         + "Description: -<br>"

src/androidTest/java/de/dennisguse/opentracks/content/SearchEngineTest.java

@@ -17,18 +17,17 @@
 package de.dennisguse.opentracks.content;
 
 import android.content.ContentUris;
-import android.content.Context;
 import android.location.Location;
 import android.net.Uri;
 
-import androidx.test.core.app.ApplicationProvider;
+import androidx.test.platform.app.InstrumentationRegistry;
-import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.rule.provider.ProviderTestRule;
 
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
-import org.junit.runner.RunWith;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -39,6 +38,8 @@ import de.dennisguse.opentracks.content.SearchEngine.SearchQuery;
 import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.CustomContentProvider;
+import de.dennisguse.opentracks.content.provider.CustomSQLiteOpenHelper;
 import de.dennisguse.opentracks.stats.TrackStatistics;
 
 /**
@@ -48,28 +49,32 @@ import de.dennisguse.opentracks.stats.TrackStatistics;
  *
  * @author Rodrigo Damazio
  */
-@RunWith(AndroidJUnit4.class)
 public class SearchEngineTest {
 
+    private static final String TAG = SearchEngineTest.class.getSimpleName();
+
     private static final Location HERE = new Location("gps");
-    private static final long NOW = SearchEngine.OLDEST_ALLOWED_TIMESTAMP + 1000;  // After OLDEST_ALLOWED_TIMESTAMP
+    private static final long NOW = SearchEngine.OLDEST_ALLOWED_TIMESTAMP + 1000;
+
+    @Rule
+    public ProviderTestRule sqliteContentProviderRule = new ProviderTestRule.Builder(CustomContentProvider.class, ContentProviderUtils.AUTHORITY_PACKAGE).setPrefix(TAG).build();
+
     private ContentProviderUtils providerUtils;
     private SearchEngine engine;
 
-    private final Context context = ApplicationProvider.getApplicationContext();
-
     @Before
     public void setUp() {
-        providerUtils = new ContentProviderUtils(context);
+        providerUtils = new ContentProviderUtils(sqliteContentProviderRule.getResolver());
+
         engine = new SearchEngine(providerUtils);
     }
 
     @After
     public void tearDown() {
-        providerUtils.deleteAllTracks(context);
+        InstrumentationRegistry.getInstrumentation().getTargetContext().deleteDatabase(TAG + CustomSQLiteOpenHelper.DATABASE_NAME);
     }
 
-    private long insertTrack(String title, String description, String category, long hoursAgo) {
+    private Track.Id insertTrack(String title, String description, String category, long hoursAgo) {
         Track track = new Track();
         track.setName(title);
         track.setDescription(description);
@@ -83,18 +88,18 @@ public class SearchEngineTest {
         }
 
         Uri uri = providerUtils.insertTrack(track);
-        return ContentUris.parseId(uri);
+        return new Track.Id(ContentUris.parseId(uri));
     }
 
-    private long insertTrack(String title, String description, String category) {
+    private Track.Id insertTrack(String title, String description, String category) {
         return insertTrack(title, description, category, -1);
     }
 
-    private long insertTrack(String title, long hoursAgo) {
+    private Track.Id insertTrack(String title, long hoursAgo) {
         return insertTrack(title, "", "", hoursAgo);
     }
 
-    private long insertWaypoint(String title, String description, String category, double distance, long hoursAgo, long trackId) {
+    private Waypoint.Id insertWaypoint(String title, String description, String category, double distance, long hoursAgo, Track.Id trackId) {
         Location location = new Location(HERE);
         location.setLatitude(location.getLatitude() + distance);
         location.setLongitude(location.getLongitude() + distance);
@@ -108,22 +113,22 @@ public class SearchEngineTest {
         waypoint.setTrackId(trackId);
 
         Uri uri = providerUtils.insertWaypoint(waypoint);
-        return ContentUris.parseId(uri);
+        return new Waypoint.Id(ContentUris.parseId(uri));
     }
 
-    private long insertWaypoint(String title, String description, String category) {
+    private Waypoint.Id insertWaypoint(String title, String description, String category) {
-        return insertWaypoint(title, description, category, 0.0, -1, -1);
+        return insertWaypoint(title, description, category, 0.0, -1, null);
     }
 
-    private long insertWaypoint(String title, double distance) {
+    private Waypoint.Id insertWaypoint(String title, double distance) {
-        return insertWaypoint(title, "", "", distance, -1, -1);
+        return insertWaypoint(title, "", "", distance, -1, null);
     }
 
-    private long insertWaypoint(String title, long hoursAgo) {
+    private Waypoint.Id insertWaypoint(String title, long hoursAgo) {
-        return insertWaypoint(title, "", "", 0.0, hoursAgo, -1);
+        return insertWaypoint(title, "", "", 0.0, hoursAgo, null);
     }
 
-    private long insertWaypoint(String title, long hoursAgo, long trackId) {
+    private Waypoint.Id insertWaypoint(String title, long hoursAgo, Track.Id trackId) {
         return insertWaypoint(title, "", "", 0.0, hoursAgo, trackId);
     }
 
@@ -138,14 +143,14 @@ public class SearchEngineTest {
         // - one which will match in title and description
         // - one which will match in all fields
         insertTrack("bb", "cc", "dd");
-        long descriptionMatchId = insertTrack("bb", "aa", "cc");
+        Track.Id descriptionMatchId = insertTrack("bb", "aa", "cc");
-        long categoryMatchId = insertTrack("bb", "cc", "aa");
+        Track.Id categoryMatchId = insertTrack("bb", "cc", "aa");
-        long titleMatchId = insertTrack("aa", "bb", "cc");
+        Track.Id titleMatchId = insertTrack("aa", "bb", "cc");
-        long titleCategoryMatchId = insertTrack("aa", "bb", "ca");
+        Track.Id titleCategoryMatchId = insertTrack("aa", "bb", "ca");
-        long titleDescriptionMatchId = insertTrack("aa", "ba", "cc");
+        Track.Id titleDescriptionMatchId = insertTrack("aa", "ba", "cc");
-        long allMatchId = insertTrack("aa", "ba", "ca");
+        Track.Id allMatchId = insertTrack("aa", "ba", "ca");
 
-        SearchQuery query = new SearchQuery("a", null, -1, NOW);
+        SearchQuery query = new SearchQuery("a", null, null, NOW);
         ArrayList<ScoredResult> results = new ArrayList<>(engine.search(query));
 
         // Title > Description > Category.
@@ -163,14 +168,14 @@ public class SearchEngineTest {
         // - one which will match in title and description
         // - one which will match in all fields
         insertWaypoint("bb", "cc", "dd");
-        long descriptionMatchId = insertWaypoint("bb", "aa", "cc");
+        Waypoint.Id descriptionMatchId = insertWaypoint("bb", "aa", "cc");
-        long categoryMatchId = insertWaypoint("bb", "cc", "aa");
+        Waypoint.Id categoryMatchId = insertWaypoint("bb", "cc", "aa");
-        long titleMatchId = insertWaypoint("aa", "bb", "cc");
+        Waypoint.Id titleMatchId = insertWaypoint("aa", "bb", "cc");
-        long titleCategoryMatchId = insertWaypoint("aa", "bb", "ca");
+        Waypoint.Id titleCategoryMatchId = insertWaypoint("aa", "bb", "ca");
-        long titleDescriptionMatchId = insertWaypoint("aa", "ba", "cc");
+        Waypoint.Id titleDescriptionMatchId = insertWaypoint("aa", "ba", "cc");
-        long allMatchId = insertWaypoint("aa", "ba", "ca");
+        Waypoint.Id allMatchId = insertWaypoint("aa", "ba", "ca");
 
-        SearchQuery query = new SearchQuery("a", null, -1, NOW);
+        SearchQuery query = new SearchQuery("a", null, null, NOW);
         ArrayList<ScoredResult> results = new ArrayList<>(engine.search(query));
 
         // Title > Description > Category.
@@ -185,13 +190,13 @@ public class SearchEngineTest {
         // - one waypoint which will match by title
         // - one track which won't match
         // - one track which will match by title
-        long descriptionWaypointId = insertWaypoint("bb", "aa", "cc");
+        Waypoint.Id descriptionWaypointId = insertWaypoint("bb", "aa", "cc");
         insertWaypoint("bb", "cc", "dd");
-        long titleWaypointId = insertWaypoint("aa", "bb", "cc");
+        Waypoint.Id titleWaypointId = insertWaypoint("aa", "bb", "cc");
         insertTrack("bb", "cc", "dd");
-        long trackId = insertTrack("aa", "bb", "cc");
+        Track.Id trackId = insertTrack("aa", "bb", "cc");
 
-        SearchQuery query = new SearchQuery("a", null, -1, NOW);
+        SearchQuery query = new SearchQuery("a", null, null, NOW);
         ArrayList<ScoredResult> results = new ArrayList<>(engine.search(query));
 
         // Title > Description > Category.
@@ -204,11 +209,11 @@ public class SearchEngineTest {
     @Test
     public void testSearchWaypointDistance() {
         // All results match text, but they're at difference distances from the user.
-        long farFarAwayId = insertWaypoint("aa", 0.3);
+        Waypoint.Id farFarAwayId = insertWaypoint("aa", 0.3);
-        long nearId = insertWaypoint("ab", 0.1);
+        Waypoint.Id nearId = insertWaypoint("ab", 0.1);
-        long farId = insertWaypoint("ac", 0.2);
+        Waypoint.Id farId = insertWaypoint("ac", 0.2);
 
-        SearchQuery query = new SearchQuery("a", HERE, -1, NOW);
+        SearchQuery query = new SearchQuery("a", HERE, null, NOW);
         ArrayList<ScoredResult> results = new ArrayList<>(engine.search(query));
 
         // Distance order.
@@ -217,11 +222,11 @@ public class SearchEngineTest {
 
     public void testSearchTrackRecent() {
         // All results match text, but they're were recorded at different times.
-        long oldestId = insertTrack("aa", 3);
+        Track.Id oldestId = insertTrack("aa", 3);
-        long recentId = insertTrack("ab", 1);
+        Track.Id recentId = insertTrack("ab", 1);
-        long oldId = insertTrack("ac", 2);
+        Track.Id oldId = insertTrack("ac", 2);
 
-        SearchQuery query = new SearchQuery("a", null, -1, NOW);
+        SearchQuery query = new SearchQuery("a", null, null, NOW);
         ArrayList<ScoredResult> results = new ArrayList<>(engine.search(query));
 
         // Reverse time order.
@@ -231,11 +236,11 @@ public class SearchEngineTest {
     @Test
     public void testSearchWaypointRecent() {
         // All results match text, but they're were recorded at different times.
-        long oldestId = insertWaypoint("aa", 2);
+        Waypoint.Id oldestId = insertWaypoint("aa", 2);
-        long recentId = insertWaypoint("ab", 0);
+        Waypoint.Id recentId = insertWaypoint("ab", 0);
-        long oldId = insertWaypoint("ac", 1);
+        Waypoint.Id oldId = insertWaypoint("ac", 1);
 
-        SearchQuery query = new SearchQuery("a", null, -1, NOW);
+        SearchQuery query = new SearchQuery("a", null, null, NOW);
         ArrayList<ScoredResult> results = new ArrayList<>(engine.search(query));
 
         // Reverse time order.
@@ -245,8 +250,8 @@ public class SearchEngineTest {
     @Test
     public void testSearchCurrentTrack() {
         // All results match text, but one of them is the current track.
-        long currentId = insertTrack("ab", 1);
+        Track.Id currentId = insertTrack("ab", 1);
-        long otherId = insertTrack("aa", 1);
+        Track.Id otherId = insertTrack("aa", 1);
 
         SearchQuery query = new SearchQuery("a", null, currentId, NOW);
         ArrayList<ScoredResult> results = new ArrayList<>(engine.search(query));
@@ -258,24 +263,29 @@ public class SearchEngineTest {
     @Test
     public void testSearchCurrentTrackWaypoint() {
         // All results match text, but one of them is in the current track.
-        long otherId = insertWaypoint("aa", 1, 456);
+        Waypoint.Id otherId = insertWaypoint("aa", 1, new Track.Id(456));
-        long currentId = insertWaypoint("ab", 1, 123);
+        Waypoint.Id currentId = insertWaypoint("ab", 1, new Track.Id(123));
 
-        SearchQuery query = new SearchQuery("a", null, 123, NOW);
+        SearchQuery query = new SearchQuery("a", null, new Track.Id(123), NOW);
         ArrayList<ScoredResult> results = new ArrayList<>(engine.search(query));
 
         // Waypoint in current track should be promoted.
         assertWaypointResults(results, currentId, otherId);
     }
 
-    private void assertTrackResult(long trackId, ScoredResult result) {
+    private void assertTrackResult(Track.Id trackId, ScoredResult result) {
         Assert.assertNotNull("Not a track", result.track);
         Assert.assertNull("Ambiguous result", result.waypoint);
         Assert.assertEquals(trackId, result.track.getId());
     }
 
-    private void assertTrackResults(List<ScoredResult> results, long... trackIds) {
+    private void assertTrackResults(List<ScoredResult> results, Track.Id... trackIds) {
-        String errMsg = "Expected IDs=" + Arrays.toString(trackIds) + "; results=" + results;
+        long[] longTrackIds = new long[trackIds.length];
+        for (int i = 0; i < trackIds.length; i++) {
+            longTrackIds[i] = trackIds[i].getId();
+        }
+
+        String errMsg = "Expected IDs=" + Arrays.toString(longTrackIds) + "; results=" + results;
         Assert.assertEquals(results.size(), trackIds.length);
         for (int i = 0; i < results.size(); i++) {
             ScoredResult result = results.get(i);
@@ -285,14 +295,19 @@ public class SearchEngineTest {
         }
     }
 
-    private void assertWaypointResult(long waypointId, ScoredResult result) {
+    private void assertWaypointResult(Waypoint.Id waypointId, ScoredResult result) {
         Assert.assertNotNull("Not a waypoint", result.waypoint);
         Assert.assertNull("Ambiguous result", result.track);
         Assert.assertEquals(waypointId, result.waypoint.getId());
     }
 
-    private void assertWaypointResults(List<ScoredResult> results, long... waypointIds) {
+    private void assertWaypointResults(List<ScoredResult> results, Waypoint.Id... waypointIds) {
-        String errMsg = "Expected IDs=" + Arrays.toString(waypointIds) + "; results=" + results;
+        long[] longWaypointIds = new long[waypointIds.length];
+        for (int i = 0; i < waypointIds.length; i++) {
+            longWaypointIds[i] = waypointIds[i].getId();
+        }
+
+        String errMsg = "Expected IDs=" + Arrays.toString(longWaypointIds) + "; results=" + results;
         Assert.assertEquals(results.size(), waypointIds.length);
         for (int i = 0; i < results.size(); i++) {
             ScoredResult result = results.get(i);

src/androidTest/java/de/dennisguse/opentracks/content/data/TestDataUtil.java

@@ -20,10 +20,10 @@ public class TestDataUtil {
     /**
      * Create a track without any trackPoints.
      */
-    public static Track createTrack(long trackId) {
+    public static Track createTrack(Track.Id trackId) {
         Track track = new Track();
         track.setId(trackId);
-        track.setName("Test: " + trackId);
+        track.setName("Test: " + trackId.getId());
 
         return track;
     }
@@ -34,7 +34,7 @@ public class TestDataUtil {
      * @param trackId   the trackId of the track
      * @param numPoints the trackPoints number in the track
      */
-    public static Pair<Track, TrackPoint[]> createTrack(long trackId, int numPoints) {
+    public static Pair<Track, TrackPoint[]> createTrack(Track.Id trackId, int numPoints) {
         Track track = createTrack(trackId);
 
         TrackPoint[] trackPoints = new TrackPoint[numPoints];
@@ -45,7 +45,7 @@ public class TestDataUtil {
         return new Pair<>(track, trackPoints);
     }
 
-    public static Track createTrackAndInsert(ContentProviderUtils contentProviderUtils, long trackId, int numPoints) {
+    public static Track createTrackAndInsert(ContentProviderUtils contentProviderUtils, Track.Id trackId, int numPoints) {
         Pair<Track, TrackPoint[]> pair = createTrack(trackId, numPoints);
 
         insertTrackWithLocations(contentProviderUtils, pair.first, pair.second);
@@ -93,12 +93,11 @@ public class TestDataUtil {
      * @param location The location.
      * @return the Waypoint created.
      */
-    public static  Waypoint createWaypointWithPhoto(Context context, long trackId, Location location) throws IOException {
+    public static Waypoint createWaypointWithPhoto(Context context, Track.Id trackId, Location location) throws IOException {
-        String photoUrl = "";
         File dstFile = new File(FileUtils.getImageUrl(context, trackId));
         dstFile.createNewFile();
         Uri photoUri = FileUtils.getUriForFile(context, dstFile);
-        photoUrl = photoUri.toString();
+        String photoUrl = photoUri.toString();
 
         return new Waypoint("Waypoint name", "Waypoint description", "Waypoint category", "", trackId, 0.0, 0, location, photoUrl);
     }

src/androidTest/java/de/dennisguse/opentracks/content/provider/CustomContentProviderTest.java

@@ -22,7 +22,6 @@ import android.net.Uri;
 
 import androidx.test.core.app.ApplicationProvider;
 
-import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -30,6 +29,9 @@ import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.data.TracksColumns;
 import de.dennisguse.opentracks.content.data.WaypointsColumns;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
 /**
  * Tests {@link CustomContentProvider}.
  *
@@ -51,7 +53,7 @@ public class CustomContentProviderTest {
      */
     @Test
     public void testOnCreate() {
-        Assert.assertTrue(customContentProvider.onCreate(context));
+        assertTrue(customContentProvider.onCreate(context));
     }
 
     /**
@@ -59,13 +61,13 @@ public class CustomContentProviderTest {
      */
     @Test
     public void testGetType() {
-        Assert.assertEquals(TracksColumns.CONTENT_TYPE, customContentProvider.getType(TracksColumns.CONTENT_URI));
+        assertEquals(TracksColumns.CONTENT_TYPE, customContentProvider.getType(TracksColumns.CONTENT_URI));
-        Assert.assertEquals(TracksColumns.CONTENT_ITEMTYPE, customContentProvider.getType(ContentUris.appendId(TracksColumns.CONTENT_URI.buildUpon(), 1).build()));
+        assertEquals(TracksColumns.CONTENT_ITEMTYPE, customContentProvider.getType(ContentUris.appendId(TracksColumns.CONTENT_URI.buildUpon(), 1).build()));
 
-        Assert.assertEquals(TrackPointsColumns.CONTENT_TYPE, customContentProvider.getType(TrackPointsColumns.CONTENT_URI_BY_ID));
+        assertEquals(TrackPointsColumns.CONTENT_TYPE, customContentProvider.getType(TrackPointsColumns.CONTENT_URI_BY_ID));
-        Assert.assertEquals(TrackPointsColumns.CONTENT_ITEMTYPE, customContentProvider.getType(ContentUris.appendId(TrackPointsColumns.CONTENT_URI_BY_TRACKID.buildUpon(), 1).build()));
+        assertEquals(TrackPointsColumns.CONTENT_ITEMTYPE, customContentProvider.getType(ContentUris.appendId(TrackPointsColumns.CONTENT_URI_BY_TRACKID.buildUpon(), 1).build()));
 
-        Assert.assertEquals(WaypointsColumns.CONTENT_TYPE, customContentProvider.getType(WaypointsColumns.CONTENT_URI));
+        assertEquals(WaypointsColumns.CONTENT_TYPE, customContentProvider.getType(WaypointsColumns.CONTENT_URI));
-        Assert.assertEquals(WaypointsColumns.CONTENT_ITEMTYPE, customContentProvider.getType(ContentUris.appendId(WaypointsColumns.CONTENT_URI.buildUpon(), 1).build()));
+        assertEquals(WaypointsColumns.CONTENT_ITEMTYPE, customContentProvider.getType(ContentUris.appendId(WaypointsColumns.CONTENT_URI.buildUpon(), 1).build()));
     }
 }

src/androidTest/java/de/dennisguse/opentracks/content/provider/CustomContentProviderUtilsTest.java

@@ -83,39 +83,39 @@ public class CustomContentProviderUtilsTest {
 
     @Test
     public void testLocationIterator_noPoints() {
-        testIterator(1, 0, 1, false);
+        testIterator(new Track.Id(1), 0, 1, false);
     }
 
     @Test
     public void testLocationIterator_noBatchAscending() {
-        testIterator(1, 50, 100, false);
+        testIterator(new Track.Id(1), 50, 100, false);
-        testIterator(2, 50, 50, false);
+        testIterator(new Track.Id(2), 50, 50, false);
     }
 
     @Test
     public void testLocationIterator_noBatchDescending() {
-        testIterator(1, 50, 100, true);
+        testIterator(new Track.Id(1), 50, 100, true);
-        testIterator(2, 50, 50, true);
+        testIterator(new Track.Id(2), 50, 50, true);
     }
 
     @Test
     public void testLocationIterator_batchAscending() {
-        testIterator(1, 50, 11, false);
+        testIterator(new Track.Id(1), 50, 11, false);
-        testIterator(2, 50, 25, false);
+        testIterator(new Track.Id(2), 50, 25, false);
     }
 
     @Test
     public void testLocationIterator_batchDescending() {
-        testIterator(1, 50, 11, true);
+        testIterator(new Track.Id(1), 50, 11, true);
-        testIterator(2, 50, 25, true);
+        testIterator(new Track.Id(2), 50, 25, true);
     }
 
     @Test
     public void testLocationIterator_largeTrack() {
-        testIterator(1, 20000, 2000, false);
+        testIterator(new Track.Id(1), 20000, 2000, false);
     }
 
-    private void testIterator(long trackId, int numPoints, int batchSize, boolean descending) {
+    private void testIterator(Track.Id trackId, int numPoints, int batchSize, boolean descending) {
         long lastPointId = initializeTrack(trackId, numPoints);
         contentProviderUtils.setDefaultCursorBatchSize(batchSize);
         List<TrackPoint> locations = new ArrayList<>(numPoints);
@@ -132,10 +132,10 @@ public class CustomContentProviderUtilsTest {
         }
     }
 
-    private long initializeTrack(long id, int numPoints) {
+    private long initializeTrack(Track.Id id, int numPoints) {
         Track track = new Track();
         track.setId(id);
-        track.setName("Test: " + id);
+        track.setName("Test: " + id.getId());
         contentProviderUtils.insertTrack(track);
         track = contentProviderUtils.getTrack(id);
         Assert.assertNotNull(track);
@@ -173,13 +173,13 @@ public class CustomContentProviderUtilsTest {
      */
     @Test
     public void testCreateTrack() {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
 
         int columnIndex = 1;
         // Id
         when(cursorMock.getColumnIndexOrThrow(TracksColumns._ID)).thenReturn(columnIndex);
         when(cursorMock.isNull(columnIndex)).thenReturn(false);
-        when(cursorMock.getLong(columnIndex)).thenReturn(trackId);
+        when(cursorMock.getLong(columnIndex)).thenReturn(trackId.getId());
 
         //Uuid
         columnIndex++;
@@ -189,7 +189,7 @@ public class CustomContentProviderUtilsTest {
 
         // Name
         columnIndex++;
-        String name = NAME_PREFIX + trackId;
+        String name = NAME_PREFIX + trackId.getId();
         when(cursorMock.getColumnIndexOrThrow(TracksColumns.NAME)).thenReturn(columnIndex);
         when(cursorMock.isNull(columnIndex)).thenReturn(false);
         when(cursorMock.getString(columnIndex)).thenReturn(name);
@@ -205,7 +205,7 @@ public class CustomContentProviderUtilsTest {
     @Test
     public void testDeleteAllTracks() {
         // Insert track, points and waypoint at first.
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         Waypoint waypoint = new Waypoint(contentProviderUtils.getLastValidTrackPoint(trackId));
@@ -235,7 +235,7 @@ public class CustomContentProviderUtilsTest {
     @Test
     public void testDeleteAllTracks_withWaypointAndPhoto() throws IOException {
         // Insert track, points and waypoint with photo at first.
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Track track = TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         TrackPoint trackPoint = contentProviderUtils.getLastValidTrackPoint(trackId);
@@ -268,20 +268,23 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#deleteTrack(Context, long)}.
+     * Tests the method {@link ContentProviderUtils#deleteTrack(Context, Track.Id)}.
      */
     @Test
     public void testDeleteTrack() {
         // Insert three tracks, points of two tracks and way point of one track.
+        long random = System.currentTimeMillis();
+        Track.Id trackId1 = new Track.Id(random);
+        Track.Id trackId2 = new Track.Id(random + 1);
+        Track.Id trackId3 = new Track.Id(random + 2);
 
-        long trackId = System.currentTimeMillis();
+        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId1, 0);
-        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 0);
 
-        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId + 1, 10);
+        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId2, 10);
-        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId + 2, 10);
+        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId3, 10);
 
-        Waypoint waypoint = new Waypoint(contentProviderUtils.getLastValidTrackPoint(trackId + 1));
+        Waypoint waypoint = new Waypoint(contentProviderUtils.getLastValidTrackPoint(trackId2));
-        waypoint.setTrackId(trackId);
+        waypoint.setTrackId(trackId1);
         contentProviderUtils.insertWaypoint(waypoint);
 
         ContentResolver contentResolver = context.getContentResolver();
@@ -292,7 +295,7 @@ public class CustomContentProviderUtilsTest {
         Cursor waypointCursor = contentResolver.query(WaypointsColumns.CONTENT_URI, null, null, null, WaypointsColumns._ID);
         Assert.assertEquals(1, waypointCursor.getCount());
         // Delete one track.
-        contentProviderUtils.deleteTrack(context, trackId);
+        contentProviderUtils.deleteTrack(context, trackId1);
         // Check whether all data of a track has been deleted.
         tracksCursor = contentResolver.query(TracksColumns.CONTENT_URI, null, null, null, TracksColumns._ID);
         Assert.assertEquals(2, tracksCursor.getCount());
@@ -303,26 +306,30 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#deleteTrack(Context, long)}.
+     * Tests the method {@link ContentProviderUtils#deleteTrack(Context, Track.Id)}.
      */
     @Test
     public void testDeleteTrack_withWaypointPhoto() throws IOException {
         // Insert three tracks.
-        long trackId = System.currentTimeMillis();
+        long random = System.currentTimeMillis();
-        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
+        Track.Id trackId1 = new Track.Id(random);
-        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId + 1, 10);
+        Track.Id trackId2 = new Track.Id(random + 1);
-        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId + 2, 10);
+        Track.Id trackId3 = new Track.Id(random + 2);
+
+        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId1, 10);
+        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId2, 10);
+        TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId3, 10);
 
         // Insert a waypoint in tracks trackId and trackId + 1.
-        TrackPoint trackPoint1 = contentProviderUtils.getLastValidTrackPoint(trackId);
+        TrackPoint trackPoint1 = contentProviderUtils.getLastValidTrackPoint(trackId1);
-        Waypoint waypoint1 = TestDataUtil.createWaypointWithPhoto(context, trackId, trackPoint1.getLocation());
+        Waypoint waypoint1 = TestDataUtil.createWaypointWithPhoto(context, trackId1, trackPoint1.getLocation());
         contentProviderUtils.insertWaypoint(waypoint1);
-        File dir1 = FileUtils.getPhotoDir(context, trackId);
+        File dir1 = FileUtils.getPhotoDir(context, trackId1);
 
-        TrackPoint trackPoint2 = contentProviderUtils.getLastValidTrackPoint(trackId + 1);
+        TrackPoint trackPoint2 = contentProviderUtils.getLastValidTrackPoint(trackId2);
-        Waypoint waypoint2 = TestDataUtil.createWaypointWithPhoto(context, trackId + 1, trackPoint2.getLocation());
+        Waypoint waypoint2 = TestDataUtil.createWaypointWithPhoto(context, trackId2, trackPoint2.getLocation());
         contentProviderUtils.insertWaypoint(waypoint2);
-        File dir2 = FileUtils.getPhotoDir(context, trackId + 1);
+        File dir2 = FileUtils.getPhotoDir(context, trackId2);
 
         // Check.
         ContentResolver contentResolver = context.getContentResolver();
@@ -340,7 +347,7 @@ public class CustomContentProviderUtilsTest {
         Assert.assertEquals(1, dir2.list().length);
         Assert.assertTrue(dir2.exists());
         // Delete one track.
-        contentProviderUtils.deleteTrack(context, trackId);
+        contentProviderUtils.deleteTrack(context, trackId1);
         // Check whether all data of a track has been deleted.
         tracksCursor = contentResolver.query(TracksColumns.CONTENT_URI, null, null, null, TracksColumns._ID);
         Assert.assertEquals(2, tracksCursor.getCount());
@@ -353,17 +360,17 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getAllTracks()}
+     * Tests the method {@link ContentProviderUtils#getTracks()}
      */
     @Test
     public void testGetAllTracks() {
         // given
-        int initialTrackNumber = contentProviderUtils.getAllTracks().size();
+        int initialTrackNumber = contentProviderUtils.getTracks().size();
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         contentProviderUtils.insertTrack(TestDataUtil.createTrack(trackId));
 
         // when
-        List<Track> allTracks = contentProviderUtils.getAllTracks();
+        List<Track> allTracks = contentProviderUtils.getTracks();
 
         // then
         Assert.assertEquals(initialTrackNumber + 1, allTracks.size());
@@ -375,28 +382,45 @@ public class CustomContentProviderUtilsTest {
      */
     @Test
     public void testGetLastTrack() {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         contentProviderUtils.insertTrack(TestDataUtil.createTrack(trackId));
         Assert.assertEquals(trackId, contentProviderUtils.getLastTrack().getId());
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getTrack(long)}
+     * Tests the method {@link ContentProviderUtils#getTrack(Track.Id)}
      */
     @Test
-    public void testGetTrack() {
+    public void testGetTrack_by_id() {
-        long trackId = System.currentTimeMillis();
+        // given
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         contentProviderUtils.insertTrack(TestDataUtil.createTrack(trackId));
+
+        // when / then
         Assert.assertNotNull(contentProviderUtils.getTrack(trackId));
     }
 
+    /**
+     * Tests the method {@link ContentProviderUtils#getTrack(Track.Id)}
+     */
+    @Test
+    public void testGetTrack_by_uuid() {
+        // given
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
+        Track track = TestDataUtil.createTrack(trackId);
+        contentProviderUtils.insertTrack(track);
+
+        // when / then
+        Assert.assertNotNull(contentProviderUtils.getTrack(track.getUuid()));
+    }
+
     /**
      * Tests the method {@link ContentProviderUtils#updateTrack(Track)}
      */
     @Test
     public void testUpdateTrack() {
         // given
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Track track = TestDataUtil.createTrack(trackId);
         String nameOld = "name1";
         String nameNew = "name2";
@@ -415,7 +439,7 @@ public class CustomContentProviderUtilsTest {
      */
     @Test
     public void testCreateContentValues_waypoint() {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Pair<Track, TrackPoint[]> track = TestDataUtil.createTrack(trackId, 10);
 
         // Bottom
@@ -441,10 +465,10 @@ public class CustomContentProviderUtilsTest {
 
         ContentProviderUtils contentProviderUtils = new ContentProviderUtils(contentResolverMock);
 
-        long waypointId = System.currentTimeMillis();
+        Waypoint.Id waypointId = new Waypoint.Id(System.currentTimeMillis());
         waypoint.setId(waypointId);
         ContentValues contentValues = contentProviderUtils.createContentValues(waypoint);
-        Assert.assertEquals(waypointId, contentValues.get(WaypointsColumns._ID));
+        Assert.assertEquals(waypointId.getId(), contentValues.get(WaypointsColumns._ID));
         Assert.assertEquals((int) (TestDataUtil.INITIAL_LONGITUDE * 1000000), contentValues.get(WaypointsColumns.LONGITUDE));
         Assert.assertEquals(TEST_DESC, contentValues.get(WaypointsColumns.DESCRIPTION));
     }
@@ -478,19 +502,19 @@ public class CustomContentProviderUtilsTest {
         when(cursorMock.getLong(columnIndex++)).thenReturn(trackId);
 
         Waypoint waypoint = contentProviderUtils.createWaypoint(cursorMock);
-        Assert.assertEquals(id, waypoint.getId());
+        Assert.assertEquals(id, waypoint.getId().getId());
         Assert.assertEquals(name, waypoint.getName());
-        Assert.assertEquals(trackId, waypoint.getTrackId());
+        Assert.assertEquals(trackId, waypoint.getTrackId().getId());
     }
 
     /**
      * Tests the method
-     * {@link ContentProviderUtils#deleteWaypoint(Context, long)}
+     * {@link ContentProviderUtils#deleteWaypoint(Context, Waypoint.Id)}
      * when there is only one waypoint in the track.
      */
     @Test
     public void testDeleteWaypoint_onlyOneWayPoint() {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         // Insert at first.
@@ -503,7 +527,7 @@ public class CustomContentProviderUtilsTest {
         Assert.assertEquals(contentProviderUtils.getWaypointCount(trackId), 1);
 
         // Get waypoint id that needs to delete.
-        long waypoint1Id = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint1));
+        Waypoint.Id waypoint1Id = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint1)));
 
         // Delete
         contentProviderUtils.deleteWaypoint(context, waypoint1Id);
@@ -513,12 +537,12 @@ public class CustomContentProviderUtilsTest {
 
     /**
      * Tests the method
-     * {@link ContentProviderUtils#deleteWaypoint(Context, long)}
+     * {@link ContentProviderUtils#deleteWaypoint(Context, Waypoint.Id)}
      * when there is only one waypoint in the track.
      */
     @Test
     public void testDeleteWaypoint_onlyOneWayPointWithPhotoUrl() throws IOException {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         // Insert at first.
@@ -530,7 +554,7 @@ public class CustomContentProviderUtilsTest {
         Assert.assertEquals(contentProviderUtils.getWaypointCount(trackId), 1);
 
         // Get waypoint id that needs to delete.
-        long waypoint1Id = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint1));
+        Waypoint.Id waypoint1Id = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint1)));
 
         // Check waypoint has photo and it's in the external storage.
         Assert.assertTrue(waypoint1.hasPhoto());
@@ -548,11 +572,11 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#deleteWaypoint(Context, long)} when there is more than one waypoint in the track.
+     * Tests the method {@link ContentProviderUtils#deleteWaypoint(Context, Waypoint.Id)} when there is more than one waypoint in the track.
      */
     @Test
     public void testDeleteWaypoint_hasNextWayPoint() {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
 //        Track track = TestDataUtil.createTrackAndInsert(trackId, 10);
@@ -575,12 +599,12 @@ public class CustomContentProviderUtilsTest {
         Waypoint waypoint1 = new Waypoint(contentProviderUtils.getLastValidTrackPoint(trackId));
         waypoint1.setDescription(MOCK_DESC);
         waypoint1.setTrackId(trackId);
-        long waypoint1Id = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint1));
+        Waypoint.Id waypoint1Id = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint1)));
 
         Waypoint waypoint2 = new Waypoint(contentProviderUtils.getLastValidTrackPoint(trackId));
         waypoint2.setDescription(MOCK_DESC);
         waypoint2.setTrackId(trackId);
-        long waypoint2Id = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint2));
+        Waypoint.Id waypoint2Id = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint2)));
 
         // Delete
         Assert.assertNotNull(contentProviderUtils.getWaypoint(waypoint1Id));
@@ -591,11 +615,11 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getNextWaypointNumber(long)}.
+     * Tests the method {@link ContentProviderUtils#getNextWaypointNumber(Track.Id)}.
      */
     @Test
     public void testGetNextWaypointNumber() {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         Waypoint waypoint1 = new Waypoint(contentProviderUtils.getLastValidTrackPoint(trackId));
@@ -616,17 +640,17 @@ public class CustomContentProviderUtilsTest {
 
     /**
      * Tests the method {@link ContentProviderUtils#insertWaypoint(Waypoint)} and
-     * {@link ContentProviderUtils#getWaypoint(long)}.
+     * {@link ContentProviderUtils#getWaypoint(Waypoint.Id)}.
      */
     @Test
     public void testInsertAndGetWaypoint() {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         Waypoint waypoint = new Waypoint(contentProviderUtils.getLastValidTrackPoint(trackId));
         waypoint.setDescription(TEST_DESC);
         waypoint.setTrackId(trackId);
-        long waypointId = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint));
+        Waypoint.Id waypointId = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint)));
 
         Assert.assertEquals(TEST_DESC, contentProviderUtils.getWaypoint(waypointId).getDescription());
     }
@@ -636,14 +660,14 @@ public class CustomContentProviderUtilsTest {
      */
     @Test
     public void testUpdateWaypoint() {
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         // Insert at first.
         Waypoint waypoint = new Waypoint(contentProviderUtils.getLastValidTrackPoint(trackId));
         waypoint.setDescription(TEST_DESC);
         waypoint.setTrackId(trackId);
-        long waypointId = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint));
+        Waypoint.Id waypointId = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint)));
 
         // Update
         waypoint = contentProviderUtils.getWaypoint(waypointId);
@@ -660,7 +684,7 @@ public class CustomContentProviderUtilsTest {
     public void testUpdateWaypoint_withPhoto() throws IOException {
         // tests after update waypoint with photo the photo remains in the storage.
 
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         // Insert at first.
@@ -668,9 +692,9 @@ public class CustomContentProviderUtilsTest {
         Waypoint waypoint = TestDataUtil.createWaypointWithPhoto(context, trackId, trackPoint.getLocation());
         waypoint.setDescription(TEST_DESC);
         waypoint.setTrackId(trackId);
-        long waypointId = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint));
+        Waypoint.Id waypointId = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint)));
 
-        File dir = new File(FileUtils.getPhotoDir(context), "" + trackId);
+        File dir = new File(FileUtils.getPhotoDir(context), "" + trackId.getId());
         Assert.assertTrue(dir.exists());
         Assert.assertTrue(dir.isDirectory());
         Assert.assertEquals(1, dir.list().length);
@@ -696,7 +720,7 @@ public class CustomContentProviderUtilsTest {
     public void testUpdateWaypoint_delPhotoAndDir() throws IOException {
         // tests after update waypoint if user deletes the photo then file photo is deleted from the storage. Also empty directory is deleted.
 
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         // Insert at first.
@@ -704,9 +728,9 @@ public class CustomContentProviderUtilsTest {
         Waypoint waypoint = TestDataUtil.createWaypointWithPhoto(context, trackId, trackPoint.getLocation());
         waypoint.setDescription(TEST_DESC);
         waypoint.setTrackId(trackId);
-        long waypointId = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint));
+        Waypoint.Id waypointId = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint)));
 
-        File dir = new File(FileUtils.getPhotoDir(context), "" + trackId);
+        File dir = new File(FileUtils.getPhotoDir(context), "" + trackId.getId());
         Assert.assertTrue(dir.exists());
         Assert.assertTrue(dir.isDirectory());
         Assert.assertEquals(1, dir.list().length);
@@ -731,7 +755,7 @@ public class CustomContentProviderUtilsTest {
     public void testUpdateWaypoint_delPhotoNotDir() throws IOException {
         // tests after update waypoint if user deletes the photo then file photo is deleted from the storage. Directory remains if there are more photos from other waypoints.
 
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         // Insert two waypoints with photos.
@@ -742,10 +766,10 @@ public class CustomContentProviderUtilsTest {
         Waypoint otherWaypoint = TestDataUtil.createWaypointWithPhoto(context, trackId, trackPoint.getLocation());
         otherWaypoint.setDescription(TEST_DESC);
         otherWaypoint.setTrackId(trackId);
-        long waypointId = ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint));
+        Waypoint.Id waypointId = new Waypoint.Id(ContentUris.parseId(contentProviderUtils.insertWaypoint(waypoint)));
-        long otherWaypointId = ContentUris.parseId(contentProviderUtils.insertWaypoint(otherWaypoint));
+        contentProviderUtils.insertWaypoint(otherWaypoint);
 
-        File dir = new File(FileUtils.getPhotoDir(context), "" + trackId);
+        File dir = new File(FileUtils.getPhotoDir(context), "" + trackId.getId());
         Assert.assertTrue(dir.exists());
         Assert.assertTrue(dir.isDirectory());
         Assert.assertEquals(2, dir.list().length);
@@ -763,12 +787,12 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#bulkInsertTrackPoint(TrackPoint[], long)}.
+     * Tests the method {@link ContentProviderUtils#bulkInsertTrackPoint(TrackPoint[], Track.Id)}.
      */
     @Test
     public void testBulkInsertTrackPoint() {
         // given
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Pair<Track, TrackPoint[]> track = TestDataUtil.createTrack(trackId, 10);
         TestDataUtil.insertTrackWithLocations(contentProviderUtils, track.first, track.second);
 
@@ -824,12 +848,12 @@ public class CustomContentProviderUtilsTest {
 
     /**
      * Tests the method
-     * {@link ContentProviderUtils#insertTrackPoint(TrackPoint, long)}.
+     * {@link ContentProviderUtils#insertTrackPoint(TrackPoint, Track.Id)}.
      */
     @Test
     public void testInsertTrackPoint() {
         // Insert track, point at first.
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Track track = TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         contentProviderUtils.insertTrackPoint(TestDataUtil.createTrackPoint(22), trackId);
@@ -839,7 +863,7 @@ public class CustomContentProviderUtilsTest {
     @Test
     public void testInsertAndLoadTrackPoint() {
         // given
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Track track = TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         TrackPoint trackPoint = TestDataUtil.createTrackPoint(5);
@@ -859,12 +883,12 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getLastValidTrackPoint(long)}.
+     * Tests the method {@link ContentProviderUtils#getLastValidTrackPoint(Track.Id)}.
      */
     @Test
     public void testGetLastValidTrackPoint() {
         // Insert track, points at first.
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Track track = TestDataUtil.createTrackAndInsert(contentProviderUtils, trackId, 10);
 
         TrackPoint lastTrackPoint = contentProviderUtils.getLastValidTrackPoint(trackId);
@@ -872,12 +896,12 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getTrackPointCursor(long, long, int, boolean)} in descending.
+     * Tests the method {@link ContentProviderUtils#getTrackPointCursor(Track.Id, long, int, boolean)} in descending.
      */
     @Test
     public void testGetTrackPointCursor_desc() {
         // given
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Pair<Track, TrackPoint[]> track = TestDataUtil.createTrack(trackId, 10);
         contentProviderUtils.insertTrack(track.first);
 
@@ -894,12 +918,12 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getTrackPointCursor(long, long, int, boolean)} in ascending.
+     * Tests the method {@link ContentProviderUtils#getTrackPointCursor(Track.Id, long, int, boolean)} in ascending.
      */
     @Test
     public void testGetTrackPointCursor_asc() {
         // given
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Pair<Track, TrackPoint[]> track = TestDataUtil.createTrack(trackId, 10);
         contentProviderUtils.insertTrack(track.first);
 
@@ -916,12 +940,12 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getTrackPointLocationIterator(long, long, boolean)} in descending.
+     * Tests the method {@link ContentProviderUtils#getTrackPointLocationIterator(Track.Id, long, boolean)} in descending.
      */
     @Test
     public void testGetTrackPointLocationIterator_desc() {
         // given
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Pair<Track, TrackPoint[]> track = TestDataUtil.createTrack(trackId, 10);
         contentProviderUtils.insertTrack(track.first);
 
@@ -945,12 +969,12 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getTrackPointLocationIterator(long, long, boolean)} in ascending.
+     * Tests the method {@link ContentProviderUtils#getTrackPointLocationIterator(Track.Id, long, boolean)} in ascending.
      */
     @Test
     public void testGetTrackPointLocationIterator_asc() {
         // given
-        long trackId = System.currentTimeMillis();
+        Track.Id trackId = new Track.Id(System.currentTimeMillis());
         Pair<Track, TrackPoint[]> track = TestDataUtil.createTrack(trackId, 10);
         contentProviderUtils.insertTrack(track.first);
 
@@ -978,7 +1002,7 @@ public class CustomContentProviderUtilsTest {
     /**
      * Checks the value of a location.
      *
-     * @param i        the index of this location which created in the method {@link TestDataUtil#createTrack(long, int)}
+     * @param i        the index of this location which created in the method {@link TestDataUtil#createTrack(Track.Id, int)}
      * @param location the location to be checked
      */
     private void checkLocation(int i, Location location) {
@@ -988,12 +1012,10 @@ public class CustomContentProviderUtilsTest {
         Assert.assertEquals(i * TestDataUtil.ALTITUDE_INTERVAL, location.getAltitude(), 0.01);
     }
 
-
     @Test
     public void testFormatIdListForUri() {
-        Assert.assertEquals("", ContentProviderUtils.formatIdListForUri(new long[]{}));
+        Assert.assertEquals("", ContentProviderUtils.formatIdListForUri());
-        Assert.assertEquals("12", ContentProviderUtils.formatIdListForUri(new long[]{12}));
+        Assert.assertEquals("12", ContentProviderUtils.formatIdListForUri(new Track.Id(12)));
-        Assert.assertEquals("42,43,44", ContentProviderUtils.formatIdListForUri(new long[]{42, 43, 44}));
+        Assert.assertEquals("42,43,44", ContentProviderUtils.formatIdListForUri(new Track.Id(42), new Track.Id(43), new Track.Id(44)));
     }
-
 }

src/androidTest/java/de/dennisguse/opentracks/content/provider/CustomSQLiteOpenHelperTest.java

@@ -2,6 +2,7 @@ package de.dennisguse.opentracks.content.provider;
 
 import android.content.Context;
 import android.database.Cursor;
+import android.database.sqlite.SQLiteConstraintException;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteOpenHelper;
 
@@ -9,7 +10,7 @@ import androidx.annotation.VisibleForTesting;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 
-import org.junit.Assert;
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -21,6 +22,10 @@ import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.data.TracksColumns;
 import de.dennisguse.opentracks.content.data.WaypointsColumns;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
 @RunWith(AndroidJUnit4.class)
 public class CustomSQLiteOpenHelperTest {
 
@@ -88,6 +93,7 @@ public class CustomSQLiteOpenHelperTest {
     }
 
     @Before
+    @After
     public void setUp() {
         context.deleteDatabase(DATABASE_NAME);
     }
@@ -95,13 +101,15 @@ public class CustomSQLiteOpenHelperTest {
     @Test
     public void onCreate() {
         try (SQLiteDatabase db = new CustomSQLiteOpenHelper(context, DATABASE_NAME).getWritableDatabase()) {
-            Assert.assertTrue(hasSqlCreate(db, TracksColumns.CREATE_TABLE));
+            assertTrue(hasSqlCreate(db, TracksColumns.CREATE_TABLE));
 
-            Assert.assertTrue(hasSqlCreate(db, TrackPointsColumns.CREATE_TABLE));
+            assertTrue(hasSqlCreate(db, TrackPointsColumns.CREATE_TABLE));
-            Assert.assertTrue(hasSqlCreate(db, TrackPointsColumns.CREATE_TABLE_INDEX));
+            assertTrue(hasSqlCreate(db, TrackPointsColumns.CREATE_TABLE_INDEX));
 
-            Assert.assertTrue(hasSqlCreate(db, WaypointsColumns.CREATE_TABLE));
+            assertTrue(hasSqlCreate(db, WaypointsColumns.CREATE_TABLE));
-            Assert.assertTrue(hasSqlCreate(db, WaypointsColumns.CREATE_TABLE_INDEX));
+            assertTrue(hasSqlCreate(db, WaypointsColumns.CREATE_TABLE_INDEX));
+        } catch (Exception e) {
+            fail();
         }
     }
 
@@ -127,18 +135,18 @@ public class CustomSQLiteOpenHelperTest {
         }
 
         // then - verify table structure
-        Assert.assertEquals(3, tableByUpgrade.size());
+        assertEquals(3, tableByUpgrade.size());
-        Assert.assertEquals(tableByUpgrade.size(), tablesByCreate.size());
+        assertEquals(tableByUpgrade.size(), tablesByCreate.size());
 
-        Assert.assertEquals(tablesByCreate.get(TracksColumns.TABLE_NAME), tableByUpgrade.get(TracksColumns.TABLE_NAME));
+        assertEquals(tablesByCreate.get(TracksColumns.TABLE_NAME), tableByUpgrade.get(TracksColumns.TABLE_NAME));
-        Assert.assertEquals(tablesByCreate.get(TrackPointsColumns.TABLE_NAME), tableByUpgrade.get(TrackPointsColumns.TABLE_NAME));
+        assertEquals(tablesByCreate.get(TrackPointsColumns.TABLE_NAME), tableByUpgrade.get(TrackPointsColumns.TABLE_NAME));
-        Assert.assertEquals(tablesByCreate.get(WaypointsColumns.TABLE_NAME), tableByUpgrade.get(WaypointsColumns.TABLE_NAME));
+        assertEquals(tablesByCreate.get(WaypointsColumns.TABLE_NAME), tableByUpgrade.get(WaypointsColumns.TABLE_NAME));
 
         // then - verify custom indices
-        Assert.assertEquals(3, indicesByCreate.size());
+        assertEquals(3, indicesByCreate.size());
-        Assert.assertEquals(indicesByUpgrade.get(TracksColumns.TABLE_NAME), indicesByCreate.get(TracksColumns.TABLE_NAME));
+        assertEquals(indicesByUpgrade.get(TracksColumns.TABLE_NAME), indicesByCreate.get(TracksColumns.TABLE_NAME));
-        Assert.assertEquals(indicesByUpgrade.get(TrackPointsColumns.TABLE_NAME), indicesByCreate.get(TrackPointsColumns.TABLE_NAME));
+        assertEquals(indicesByUpgrade.get(TrackPointsColumns.TABLE_NAME), indicesByCreate.get(TrackPointsColumns.TABLE_NAME));
-        Assert.assertEquals(indicesByUpgrade.get(WaypointsColumns.TABLE_NAME), indicesByCreate.get(WaypointsColumns.TABLE_NAME));
+        assertEquals(indicesByUpgrade.get(WaypointsColumns.TABLE_NAME), indicesByCreate.get(WaypointsColumns.TABLE_NAME));
     }
 
     @Test
@@ -155,12 +163,23 @@ public class CustomSQLiteOpenHelperTest {
         }
 
         // then - verify table structure
-        Assert.assertEquals(TRACKS_CREATE_TABLE_V23, tablesByDowngrade.get("tracks"));
+        assertEquals(TRACKS_CREATE_TABLE_V23, tablesByDowngrade.get("tracks"));
-        Assert.assertEquals(TRACKPOINTS_CREATE_TABLE_V23, tablesByDowngrade.get("trackpoints"));
+        assertEquals(TRACKPOINTS_CREATE_TABLE_V23, tablesByDowngrade.get("trackpoints"));
-        Assert.assertEquals(WAYPOINTS_CREATE_TABLE_V23, tablesByDowngrade.get("waypoints"));
+        assertEquals(WAYPOINTS_CREATE_TABLE_V23, tablesByDowngrade.get("waypoints"));
 
         // then - verify custom indices
-        Assert.assertEquals(0, indicesByDowngrade.size());
+        assertEquals(0, indicesByDowngrade.size());
+    }
+
+    @Test
+    public void track_uuid_unique() {
+        try (SQLiteDatabase db = new CustomSQLiteOpenHelper(context, DATABASE_NAME).getWritableDatabase()) {
+            db.execSQL("INSERT INTO tracks (uuid) VALUES (0x00)");
+            db.execSQL("INSERT INTO tracks (uuid) VALUES (0x00)");
+            fail("unique constraint not enforced");
+        } catch (SQLiteConstraintException e) {
+            assertTrue(e.getMessage().contains("UNIQUE constraint failed: tracks.uuid"));
+        }
     }
 
     private void createVersion23() {

src/androidTest/java/de/dennisguse/opentracks/content/provider/ShareContentProviderTest.java

@@ -6,6 +6,10 @@ import android.util.Pair;
 import org.junit.Assert;
 import org.junit.Test;
 
+import java.util.HashSet;
+import java.util.Set;
+
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
 
 public class ShareContentProviderTest {
@@ -14,20 +18,25 @@ public class ShareContentProviderTest {
     public void testCreateandParseURI_invalid() {
         Uri uri = Uri.parse("content://de.dennisguse.opentracks.debug.content/tracks/1");
 
-        Assert.assertArrayEquals(new long[]{}, ShareContentProvider.parseURI(uri));
+        Assert.assertEquals(0, ShareContentProvider.parseURI(uri).size());
     }
 
     @Test
     public void testCreateandParseURI_valid() {
-        long[] trackIds = {1, 3, 5};
+        Set<Track.Id> trackIds = new HashSet<>();
+        trackIds.add(new Track.Id(1));
+        trackIds.add(new Track.Id(3));
+        trackIds.add(new Track.Id(5));
+
         Pair<Uri, String> shareURIandMIME = ShareContentProvider.createURI(trackIds, "TrackName", TrackFileFormat.KML_ONLY_TRACK);
 
-        Assert.assertArrayEquals(trackIds, ShareContentProvider.parseURI(shareURIandMIME.first));
+        Assert.assertEquals(trackIds, ShareContentProvider.parseURI(shareURIandMIME.first));
     }
 
     @Test
     public void testCreateURIescapeFilename() {
-        long[] trackIds = {1};
+        Set<Track.Id> trackIds = new HashSet<>();
+        trackIds.add(new Track.Id(1));
         Pair<Uri, String> shareURIandMIME = ShareContentProvider.createURI(trackIds, "../../&1=1", TrackFileFormat.KML_ONLY_TRACK);
 
         Assert.assertEquals(Uri.parse("content://de.dennisguse.opentracks.debug.content/tracks/kml_only_track/1/..%2F..%2F%261%3D1.kml"), shareURIandMIME.first);

src/androidTest/java/de/dennisguse/opentracks/fragments/ChartFragmentTest.java

@@ -253,7 +253,7 @@ public class ChartFragmentTest {
         trackPoint2.setTime(trackPoint1.getTime() + 222);
         trackPoint2.setSpeed(130);
         point = chartFragment.createPendingPoint(trackPoint2);
-        Assert.assertEquals(130.0 * UnitConversions.MS_TO_KMH, point.getSpeed(), 0.01);
+        Assert.assertEquals(130.0 * UnitConversions.MPS_TO_KMH, point.getSpeed(), 0.01);
     }
 
     /**
@@ -278,7 +278,7 @@ public class ChartFragmentTest {
         trackPoint2.setTime(trackPoint2.getTime() + 222);
         trackPoint2.setSpeed(102);
         point = chartFragment.createPendingPoint(trackPoint2);
-        Assert.assertEquals(102.0 * UnitConversions.MS_TO_KMH * UnitConversions.KM_TO_MI, point.getSpeed(), 0.01);
+        Assert.assertEquals(102.0 * UnitConversions.MPS_TO_KMH * UnitConversions.KM_TO_MI, point.getSpeed(), 0.01);
     }
 
     /**
@@ -303,7 +303,7 @@ public class ChartFragmentTest {
         trackPoint2.setTime(trackPoint2.getTime() + 222);
         trackPoint2.setSpeed(102);
         point = chartFragment.createPendingPoint(trackPoint2);
-        Assert.assertEquals(HOURS_PER_UNIT / (102.0 * UnitConversions.MS_TO_KMH), point.getPace(), 0.01);
+        Assert.assertEquals(HOURS_PER_UNIT / (102.0 * UnitConversions.MPS_TO_KMH), point.getPace(), 0.01);
     }
 
     /**

src/androidTest/java/de/dennisguse/opentracks/io/file/importer/AbstractTestFileTrackImporter.java

@@ -29,13 +29,13 @@ import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 
 import java.text.SimpleDateFormat;
+import java.time.ZoneOffset;
 import java.util.Locale;
 import java.util.SimpleTimeZone;
+import java.util.TimeZone;
 
 import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TrackPoint;
-import de.dennisguse.opentracks.content.data.TracksColumns;
-import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.data.WaypointsColumns;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 
@@ -64,11 +64,11 @@ public abstract class AbstractTestFileTrackImporter {
 
     static final SimpleDateFormat DATE_FORMAT_0 = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss'Z'", Locale.US);
     static final SimpleDateFormat DATE_FORMAT_1 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS", Locale.US);
-    static final long TRACK_ID_0 = 1;
+
     static final long TRACK_POINT_ID_0 = 1;
     static final long TRACK_POINT_ID_1 = 2;
     static final long TRACK_POINT_ID_3 = 4;
-    static final Uri TRACK_ID_0_URI = ContentUris.appendId(TracksColumns.CONTENT_URI.buildUpon(), TRACK_ID_0).build();
+
     private static final long WAYPOINT_ID_0 = 1;
     private static final Uri WAYPOINT_ID_O_URI = ContentUris.appendId(WaypointsColumns.CONTENT_URI.buildUpon(), WAYPOINT_ID_0).build();
 
@@ -76,7 +76,7 @@ public abstract class AbstractTestFileTrackImporter {
 
     static {
         // We can't omit the timezones in the test, otherwise it'll use the local timezone and fail depending on where the test runner is.
-        SimpleTimeZone utc = new SimpleTimeZone(0, "UTC");
+        TimeZone utc = SimpleTimeZone.getTimeZone(ZoneOffset.UTC);
         DATE_FORMAT_0.setTimeZone(utc);
         DATE_FORMAT_1.setTimeZone(utc);
     }
@@ -100,7 +100,7 @@ public abstract class AbstractTestFileTrackImporter {
      * @param trackId      the track id
      * @param trackPointId the track point id
      */
-    protected void expectFirstTrackPoint(TrackPoint trackPoint, long trackId, long trackPointId) {
+    protected void expectFirstTrackPoint(TrackPoint trackPoint, Track.Id trackId, long trackPointId) {
         when(contentProviderUtils.bulkInsertTrackPoint(trackPoint != null ? (TrackPoint[]) any() : (TrackPoint[]) any(), eq(trackId))).thenReturn(1);
     }
 
@@ -111,10 +111,10 @@ public abstract class AbstractTestFileTrackImporter {
      * @param lastTrack   true if it is the last track in the gpx
      * @param trackId     the track id
      */
-    protected void expectTrackUpdate(ArgumentCaptor<Track> trackCaptor, boolean lastTrack, long trackId) {
+    protected void expectTrackUpdate(ArgumentCaptor<Track> trackCaptor, boolean lastTrack, Track.Id trackId) {
         contentProviderUtils.updateTrack(trackCaptor.capture());
 
-        when(contentProviderUtils.insertWaypoint((Waypoint) any())).thenReturn(WAYPOINT_ID_O_URI);
+        when(contentProviderUtils.insertWaypoint(any())).thenReturn(WAYPOINT_ID_O_URI);
         if (lastTrack) {
             // Return null to not add waypoints
             when(contentProviderUtils.getTrack(trackId)).thenReturn(null);

src/androidTest/java/de/dennisguse/opentracks/io/file/importer/ExportImportTest.java

@@ -20,6 +20,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import de.dennisguse.opentracks.R;
 import de.dennisguse.opentracks.content.data.TestDataUtil;
 import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TrackPoint;
@@ -28,9 +29,11 @@ import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
 import de.dennisguse.opentracks.io.file.exporter.TrackExporter;
 import de.dennisguse.opentracks.stats.TrackStatistics;
+import de.dennisguse.opentracks.util.PreferencesUtils;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
 
 /**
  * Export a track to {@link TrackFileFormat} and verify that the import is identical.
@@ -53,8 +56,8 @@ public class ExportImportTest {
     private final List<Waypoint> waypoints = new ArrayList<>();
     private final List<TrackPoint> trackPoints = new ArrayList<>();
 
-    private long importTrackId;
+    private Track.Id importTrackId;
-    private final long trackId = System.currentTimeMillis();
+    private final Track.Id trackId = new Track.Id(System.currentTimeMillis());
 
     @Before
     public void setUp() {
@@ -103,16 +106,17 @@ public class ExportImportTest {
         // given
         Track track = contentProviderUtils.getTrack(trackId);
 
-        TrackExporter trackExporter = TrackFileFormat.KML_WITH_TRACKDETAIL.newTrackExporter(context, new Track[]{track});
+        TrackExporter trackExporter = TrackFileFormat.KML_WITH_TRACKDETAIL.newTrackExporter(context);
 
         // when
         // 1. export
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-        trackExporter.writeTrack(context, outputStream);
+        trackExporter.writeTrack(track, outputStream);
+        contentProviderUtils.deleteTrack(context, trackId);
 
         // 2. import
         InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
-        AbstractFileTrackImporter trackImporter = new KmlFileTrackImporter(context, -1L);
+        AbstractFileTrackImporter trackImporter = new KmlFileTrackImporter(context);
         importTrackId = trackImporter.importFile(inputStream);
 
         // then
@@ -123,6 +127,7 @@ public class ExportImportTest {
         assertEquals(track.getDescription(), importedTrack.getDescription());
         assertEquals(track.getName(), importedTrack.getName());
         assertEquals(track.getIcon(), importedTrack.getIcon());
+        assertEquals(track.getUuid(), importedTrack.getUuid());
 
         // 2. waypoints
         assertWaypoints();
@@ -137,16 +142,17 @@ public class ExportImportTest {
         // given
         Track track = contentProviderUtils.getTrack(trackId);
 
-        TrackExporter trackExporter = TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.newTrackExporter(context, new Track[]{track});
+        TrackExporter trackExporter = TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.newTrackExporter(context);
 
         // when
         // 1. export
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-        trackExporter.writeTrack(context, outputStream);
+        trackExporter.writeTrack(track, outputStream);
+        contentProviderUtils.deleteTrack(context, trackId);
 
         // 2. import
         InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
-        AbstractFileTrackImporter trackImporter = new KmlFileTrackImporter(context, -1L);
+        AbstractFileTrackImporter trackImporter = new KmlFileTrackImporter(context);
         importTrackId = trackImporter.importFile(inputStream);
 
         // then
@@ -165,6 +171,30 @@ public class ExportImportTest {
         assertTrackpoints(true, true, true);
     }
 
+    @LargeTest
+    @Test
+    public void kml_with_trackdetail_and_sensordata_duplicate_trackUUID() {
+        // given
+        PreferencesUtils.setBoolean(context, R.string.import_prevent_reimport_key, true);
+        Track track = contentProviderUtils.getTrack(trackId);
+
+        TrackExporter trackExporter = TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.newTrackExporter(context);
+
+        // when
+        // 1. export
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        trackExporter.writeTrack(track, outputStream);
+
+        // 2. import
+        InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
+        AbstractFileTrackImporter trackImporter = new KmlFileTrackImporter(context);
+        importTrackId = trackImporter.importFile(inputStream);
+
+        // then
+        Track importedTrack = contentProviderUtils.getTrack(importTrackId);
+        assertNull(importedTrack);
+    }
+
     @LargeTest
     @Test
     public void kmz_only_track() {
@@ -199,12 +229,13 @@ public class ExportImportTest {
         // given
         Track track = contentProviderUtils.getTrack(trackId);
 
-        TrackExporter trackExporter = TrackFileFormat.GPX.newTrackExporter(context, new Track[]{track});
+        TrackExporter trackExporter = TrackFileFormat.GPX.newTrackExporter(context);
 
         // when
         // 1. export
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-        trackExporter.writeTrack(context, outputStream);
+        trackExporter.writeTrack(track, outputStream);
+        contentProviderUtils.deleteTrack(context, trackId);
 
         // 2. import
         InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
@@ -229,6 +260,31 @@ public class ExportImportTest {
         assertTrackpoints(false, true, true);
     }
 
+    @LargeTest
+    @Test
+    public void gpx_duplicate_trackUUID() {
+        // given
+        PreferencesUtils.setBoolean(context, R.string.import_prevent_reimport_key, true);
+        Track track = contentProviderUtils.getTrack(trackId);
+
+        TrackExporter trackExporter = TrackFileFormat.GPX.newTrackExporter(context);
+
+        // when
+        // 1. export
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        trackExporter.writeTrack(track, outputStream);
+
+        // 2. import
+        InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
+        AbstractFileTrackImporter trackImporter = new GpxFileTrackImporter(context, contentProviderUtils);
+        importTrackId = trackImporter.importFile(inputStream);
+
+        // then
+        // 1. track
+        Track trackImported = contentProviderUtils.getTrack(importTrackId);
+        assertNull(trackImported);
+    }
+
     private void assertWaypoints() {
         assertEquals(waypoints.size(), contentProviderUtils.getWaypointCount(importTrackId));
 

src/androidTest/java/de/dennisguse/opentracks/io/file/importer/GpxFileTrackImporterTest.java

@@ -1,217 +0,0 @@
-/*
- * Copyright 2010 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not
- * use this file except in compliance with the License. You may obtain a copy of
- * the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations under
- * the License.
- */
-
-package de.dennisguse.opentracks.io.file.importer;
-
-import org.junit.Assert;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.ArgumentCaptor;
-import org.mockito.junit.MockitoJUnitRunner;
-
-import java.io.ByteArrayInputStream;
-import java.io.InputStream;
-
-import de.dennisguse.opentracks.content.data.Track;
-import de.dennisguse.opentracks.content.data.TrackPoint;
-import de.dennisguse.opentracks.util.PreferencesUtils;
-
-import static org.mockito.Mockito.any;
-import static org.mockito.Mockito.anyLong;
-import static org.mockito.Mockito.atLeastOnce;
-import static org.mockito.Mockito.eq;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-/**
- * Tests for {@link GpxFileTrackImporter}.
- *
- * @author Steffen Horlacher
- */
-@RunWith(MockitoJUnitRunner.class)
-public class GpxFileTrackImporterTest extends AbstractTestFileTrackImporter {
-
-    private static final String VALID_ONE_TRACK_ONE_SEGMENT_GPX = "<gpx><trk>"
-            + getNameAndDescription(TRACK_NAME_0, TRACK_DESCRIPTION_0) + "<trkseg>"
-            + getTrackPoint(0, TRACK_TIME_0) + getTrackPoint(1, TRACK_TIME_1) + "</trkseg></trk></gpx>";
-    private static final String VALID_ONE_TRACK_TWO_SEGMENTS_GPX = "<gpx><trk>"
-            + getNameAndDescription(TRACK_NAME_0, TRACK_DESCRIPTION_0) + "<trkseg>"
-            + getTrackPoint(0, TRACK_TIME_0) + getTrackPoint(1, TRACK_TIME_1) + "</trkseg><trkseg>"
-            + getTrackPoint(2, TRACK_TIME_2) + getTrackPoint(3, TRACK_TIME_3) + "</trkseg></trk></gpx>";
-    private static final String VALID_ONE_TRACK_TWO_SEGMENTS_NO_TIME_GPX = "<gpx><trk>"
-            + getNameAndDescription(TRACK_NAME_0, TRACK_DESCRIPTION_0) + "<trkseg>"
-            + getTrackPoint(0, null) + getTrackPoint(1, null) + "</trkseg><trkseg>"
-            + getTrackPoint(2, null) + getTrackPoint(3, null) + "</trkseg></trk></gpx>";
-
-    private static final String INVALID_XML_GPX = VALID_ONE_TRACK_ONE_SEGMENT_GPX.substring(0, VALID_ONE_TRACK_ONE_SEGMENT_GPX.length() - 50);
-    private static final String INVALID_LOCATION_GPX = VALID_ONE_TRACK_ONE_SEGMENT_GPX.replaceAll(Double.toString(TRACK_LATITUDE), "1000.0");
-    private static final String INVALID_TIME_GPX = VALID_ONE_TRACK_ONE_SEGMENT_GPX.replaceAll(TRACK_TIME_0, "invalid");
-    private static final String INVALID_ALTITUDE_GPX = VALID_ONE_TRACK_ONE_SEGMENT_GPX.replaceAll(Double.toString(TRACK_ELEVATION), "invalid");
-    private static final String INVALID_LATITUDE_GPX = VALID_ONE_TRACK_ONE_SEGMENT_GPX.replaceAll(Double.toString(TRACK_LATITUDE), "invalid");
-    private static final String INVALID_LONGITUDE_GPX = VALID_ONE_TRACK_ONE_SEGMENT_GPX.replaceAll(Double.toString(TRACK_LONGITUDE), "invalid");
-
-    private static String getNameAndDescription(String name, String description) {
-        return "<name><![CDATA[" + name + "]]></name>" + "<desc><![CDATA[" + description + "]]></desc>";
-    }
-
-    private static String getTrackPoint(int index, String time) {
-        String latitude = Double.toString(TRACK_LATITUDE + index);
-        String longitude = Double.toString(TRACK_LONGITUDE + index);
-        String elevation = Double.toString(TRACK_ELEVATION + index);
-        StringBuilder buffer = new StringBuilder();
-        buffer.append("<trkpt lat=\"").append(latitude).append("\" lon=\"").append(longitude).append("\"><ele>").append(elevation).append("</ele>");
-        if (time != null) {
-            buffer.append("<time>").append(time).append("</time>");
-        }
-        buffer.append("</trkpt>");
-        return buffer.toString();
-    }
-
-    @Test
-    public void testOneTrackOneSegment() throws Exception {
-        // given
-        TrackPoint trackPoint0 = createTrackPoint(0, DATE_FORMAT_0.parse(TRACK_TIME_0).getTime());
-        TrackPoint trackPoint1 = createTrackPoint(1, DATE_FORMAT_1.parse(TRACK_TIME_1).getTime());
-
-        when(contentProviderUtils.insertTrack((Track) any())).thenReturn(TRACK_ID_0_URI);
-        expectFirstTrackPoint(trackPoint0, TRACK_ID_0, TRACK_POINT_ID_0);
-
-        // A flush happens at the end
-        when(contentProviderUtils.bulkInsertTrackPoint((TrackPoint[]) any(), eq(TRACK_ID_0))).thenReturn(1);
-        when(contentProviderUtils.getLastTrackPointId(TRACK_ID_0)).thenReturn(TRACK_POINT_ID_1);
-        when(contentProviderUtils.getTrack(PreferencesUtils.getRecordingTrackId(context))).thenReturn(null);
-        ArgumentCaptor<Track> trackCaptor = ArgumentCaptor.forClass(Track.class);
-        expectTrackUpdate(trackCaptor, true, TRACK_ID_0);
-
-        // when
-        InputStream inputStream = new ByteArrayInputStream(VALID_ONE_TRACK_ONE_SEGMENT_GPX.getBytes());
-        GpxFileTrackImporter gpxFileTrackImporter = new GpxFileTrackImporter(context, contentProviderUtils);
-        long trackId = gpxFileTrackImporter.importFile(inputStream);
-
-        // then
-        Assert.assertEquals(TRACK_ID_0, trackId);
-
-        verify(contentProviderUtils, atLeastOnce()).updateTrack(trackCaptor.capture());
-        long time0 = DATE_FORMAT_0.parse(TRACK_TIME_0).getTime();
-        long time1 = DATE_FORMAT_1.parse(TRACK_TIME_1).getTime();
-        Assert.assertEquals(time1 - time0, trackCaptor.getValue().getTrackStatistics().getTotalTime());
-        verifyTrack(trackCaptor.getValue(), TRACK_NAME_0, TRACK_DESCRIPTION_0, time0);
-    }
-
-    @Test
-    public void testOneTrackTwoSegments() throws Exception {
-        // given
-        TrackPoint trackPoint0 = createTrackPoint(0, DATE_FORMAT_0.parse(TRACK_TIME_0).getTime());
-
-        when(contentProviderUtils.insertTrack((Track) any())).thenReturn(TRACK_ID_0_URI);
-        expectFirstTrackPoint(trackPoint0, TRACK_ID_0, TRACK_POINT_ID_0);
-        // A flush happens at the end
-        when(contentProviderUtils.bulkInsertTrackPoint((TrackPoint[]) any(), eq(TRACK_ID_0))).thenReturn(5);
-        when(contentProviderUtils.getLastTrackPointId(TRACK_ID_0)).thenReturn(TRACK_POINT_ID_3);
-        when(contentProviderUtils.getTrack(PreferencesUtils.getRecordingTrackId(context))).thenReturn(null);
-
-        ArgumentCaptor<Track> trackCaptor = ArgumentCaptor.forClass(Track.class);
-        expectTrackUpdate(trackCaptor, true, TRACK_ID_0);
-
-        // when
-        InputStream inputStream = new ByteArrayInputStream(VALID_ONE_TRACK_TWO_SEGMENTS_GPX.getBytes());
-        GpxFileTrackImporter gpxFileTrackImporter = new GpxFileTrackImporter(context, contentProviderUtils);
-        long trackId = gpxFileTrackImporter.importFile(inputStream);
-
-        // then
-        verify(contentProviderUtils, atLeastOnce()).updateTrack(trackCaptor.capture());
-        Assert.assertEquals(TRACK_ID_0, trackId);
-
-        long time0 = DATE_FORMAT_0.parse(TRACK_TIME_0).getTime();
-        long time1 = DATE_FORMAT_1.parse(TRACK_TIME_1).getTime();
-        long time2 = DATE_FORMAT_1.parse(TRACK_TIME_2).getTime();
-        long time3 = DATE_FORMAT_1.parse(TRACK_TIME_3).getTime();
-        Assert.assertEquals(time1 - time0 + time3 - time2, trackCaptor.getValue().getTrackStatistics().getTotalTime());
-
-        verifyTrack(trackCaptor.getValue(), TRACK_NAME_0, TRACK_DESCRIPTION_0, DATE_FORMAT_0.parse(TRACK_TIME_0).getTime());
-    }
-
-    @Test
-    public void testOneTrackTwoSegmentsNoTime() {
-        // given
-        when(contentProviderUtils.insertTrack((Track) any())).thenReturn(TRACK_ID_0_URI);
-        expectFirstTrackPoint(null, TRACK_ID_0, TRACK_POINT_ID_0);
-
-        // A flush happens at the end
-        when(contentProviderUtils.bulkInsertTrackPoint((TrackPoint[]) any(), eq(TRACK_ID_0))).thenReturn(5);
-        when(contentProviderUtils.getLastTrackPointId(TRACK_ID_0)).thenReturn(TRACK_POINT_ID_3);
-        when(contentProviderUtils.getTrack(PreferencesUtils.getRecordingTrackId(context))).thenReturn(null);
-
-        ArgumentCaptor<Track> trackCaptor = ArgumentCaptor.forClass(Track.class);
-        expectTrackUpdate(trackCaptor, true, TRACK_ID_0);
-
-        // when
-        InputStream inputStream = new ByteArrayInputStream(VALID_ONE_TRACK_TWO_SEGMENTS_NO_TIME_GPX.getBytes());
-        GpxFileTrackImporter gpxFileTrackImporter = new GpxFileTrackImporter(context, contentProviderUtils);
-        long trackId = gpxFileTrackImporter.importFile(inputStream);
-
-        // then
-        verify(contentProviderUtils, atLeastOnce()).updateTrack(trackCaptor.capture());
-        Assert.assertEquals(TRACK_ID_0, trackId);
-
-        Assert.assertEquals(0, trackCaptor.getValue().getTrackStatistics().getTotalTime());
-        verifyTrack(trackCaptor.getValue(), TRACK_NAME_0, TRACK_DESCRIPTION_0, -1L);
-    }
-
-    @Test
-    public void testInvalidXml() {
-        testInvalidGpx(INVALID_XML_GPX);
-    }
-
-    @Test
-    public void testInvalidLocation() {
-        testInvalidGpx(INVALID_LOCATION_GPX);
-    }
-
-    @Test
-    public void testInvalidTime() {
-        testInvalidGpx(INVALID_TIME_GPX);
-    }
-
-    @Test
-    public void testInvalidAltitude() {
-        testInvalidGpx(INVALID_ALTITUDE_GPX);
-    }
-
-    @Test
-    public void testInvalidLatitude() {
-        testInvalidGpx(INVALID_LATITUDE_GPX);
-    }
-
-    @Test
-    public void testInvalidLongitude() {
-        testInvalidGpx(INVALID_LONGITUDE_GPX);
-    }
-
-    private void testInvalidGpx(String xml) {
-        when(contentProviderUtils.insertTrack((Track) any())).thenReturn(TRACK_ID_0_URI);
-
-        // For the following, use StubReturn since we don't care whether they are invoked or not.
-        when(contentProviderUtils.bulkInsertTrackPoint((TrackPoint[]) any(), anyLong())).thenReturn(1);
-        when(contentProviderUtils.getTrack(PreferencesUtils.getRecordingTrackId(context))).thenReturn(null);
-        contentProviderUtils.deleteTrack(context, TRACK_ID_0);
-
-        InputStream inputStream = new ByteArrayInputStream(xml.getBytes());
-        GpxFileTrackImporter gpxFileTrackImporter = new GpxFileTrackImporter(context, contentProviderUtils);
-        long trackId = gpxFileTrackImporter.importFile(inputStream);
-        Assert.assertEquals(-1L, trackId);
-    }
-}

src/androidTest/java/de/dennisguse/opentracks/io/file/importer/KmlFileTrackImporterTest.java

@@ -1,133 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not
- * use this file except in compliance with the License. You may obtain a copy of
- * the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations under
- * the License.
- */
-
-package de.dennisguse.opentracks.io.file.importer;
-
-import org.junit.Assert;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.ArgumentCaptor;
-import org.mockito.junit.MockitoJUnitRunner;
-
-import java.io.ByteArrayInputStream;
-import java.io.InputStream;
-
-import de.dennisguse.opentracks.content.data.Track;
-import de.dennisguse.opentracks.content.data.TrackPoint;
-import de.dennisguse.opentracks.util.PreferencesUtils;
-
-import static org.mockito.Mockito.any;
-import static org.mockito.Mockito.atLeastOnce;
-import static org.mockito.Mockito.eq;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-/**
- * Tests for {@link KmlFileTrackImporter}.
- *
- * @author Jimmy Shih
- */
-@RunWith(MockitoJUnitRunner.class)
-public class KmlFileTrackImporterTest extends AbstractTestFileTrackImporter {
-
-    private static final String VALID_ONE_TRACK_ONE_SEGMENT_GPX = "<kml xmlns:gx=\"http://www.google.com/kml/ext/2.2\"><Placemark>"
-                    + getNameAndDescription(TRACK_NAME_0, TRACK_DESCRIPTION_0) + "<gx:MultiTrack><gx:Track>"
-                    + getTrackPoint(0, TRACK_TIME_0) + getTrackPoint(1, TRACK_TIME_1)
-                    + "</gx:Track></gx:MultiTrack></Placemark></kml>";
-    private static final String VALID_ONE_TRACK_TWO_SEGMENTS_GPX = "<kml xmlns:gx=\"http://www.google.com/kml/ext/2.2\"><Placemark>"
-                    + getNameAndDescription(TRACK_NAME_0, TRACK_DESCRIPTION_0) + "<gx:MultiTrack><gx:Track>"
-                    + getTrackPoint(0, TRACK_TIME_0) + getTrackPoint(1, TRACK_TIME_1) + "</gx:Track><gx:Track>"
-                    + getTrackPoint(2, TRACK_TIME_2) + getTrackPoint(3, TRACK_TIME_3)
-                    + "</gx:Track></gx:MultiTrack></Placemark></kml>";
-
-    private static String getNameAndDescription(String name, String description) {
-        return "<name><![CDATA[" + name + "]]></name><description><![CDATA[" + description
-                + "]]></description>";
-    }
-
-    private static String getTrackPoint(int index, String time) {
-        String latitude = Double.toString(TRACK_LATITUDE + index);
-        String longitude = Double.toString(TRACK_LONGITUDE + index);
-        String altitude = Double.toString(TRACK_ELEVATION + index);
-        return "<when>" + time + "</when>" + "<gx:coord>" + longitude + " " + latitude + " " + altitude + "</gx:coord>";
-    }
-
-    @Test
-    public void testOneTrackOneSegment() throws Exception {
-        // given
-        TrackPoint trackPoint0 = createTrackPoint(0, DATE_FORMAT_0.parse(TRACK_TIME_0).getTime());
-        TrackPoint trackPointl1 = createTrackPoint(1, DATE_FORMAT_1.parse(TRACK_TIME_1).getTime());
-
-        contentProviderUtils.clearTrack(context, TRACK_ID_0);
-        expectFirstTrackPoint(trackPoint0, TRACK_ID_0, TRACK_POINT_ID_0);
-
-        // A flush happens at the end
-        when(contentProviderUtils.bulkInsertTrackPoint((TrackPoint[]) any(), eq(TRACK_ID_0))).thenReturn(1);
-        when(contentProviderUtils.getLastTrackPointId(TRACK_ID_0)).thenReturn(TRACK_POINT_ID_1);
-        when(contentProviderUtils.getTrack(PreferencesUtils.getRecordingTrackId(context))).thenReturn(null);
-
-        ArgumentCaptor<Track> trackCaptor = ArgumentCaptor.forClass(Track.class);
-        expectTrackUpdate(trackCaptor, true, TRACK_ID_0);
-
-        // when
-        InputStream inputStream = new ByteArrayInputStream(VALID_ONE_TRACK_ONE_SEGMENT_GPX.getBytes());
-        KmlFileTrackImporter kmlFileTrackImporter = new KmlFileTrackImporter(context, TRACK_ID_0, contentProviderUtils);
-        long trackId = kmlFileTrackImporter.importFile(inputStream);
-
-        // then
-        verify(contentProviderUtils, atLeastOnce()).updateTrack(trackCaptor.capture());
-        Assert.assertEquals(TRACK_ID_0, trackId);
-
-        long time0 = DATE_FORMAT_0.parse(TRACK_TIME_0).getTime();
-        long time1 = DATE_FORMAT_1.parse(TRACK_TIME_1).getTime();
-        Assert.assertEquals(time1 - time0, trackCaptor.getValue().getTrackStatistics().getTotalTime());
-        verifyTrack(trackCaptor.getValue(), TRACK_NAME_0, TRACK_DESCRIPTION_0, time0);
-    }
-
-    @Test
-    public void testOneTrackTwoSegments() throws Exception {
-        // given
-        TrackPoint trackPoint0 = createTrackPoint(0, DATE_FORMAT_0.parse(TRACK_TIME_0).getTime());
-
-        contentProviderUtils.clearTrack(context, TRACK_ID_0);
-        expectFirstTrackPoint(trackPoint0, TRACK_ID_0, TRACK_POINT_ID_0);
-
-        // A flush happens at the end
-        when(contentProviderUtils.bulkInsertTrackPoint((TrackPoint[]) any(), eq(TRACK_ID_0))).thenReturn(5);
-        when(contentProviderUtils.getLastTrackPointId(TRACK_ID_0)).thenReturn(TRACK_POINT_ID_3);
-        when(contentProviderUtils.getTrack(PreferencesUtils.getRecordingTrackId(context))).thenReturn(null);
-
-        ArgumentCaptor<Track> trackCaptor = ArgumentCaptor.forClass(Track.class);
-        expectTrackUpdate(trackCaptor, true, TRACK_ID_0);
-
-        // when
-        InputStream inputStream = new ByteArrayInputStream(VALID_ONE_TRACK_TWO_SEGMENTS_GPX.getBytes());
-        KmlFileTrackImporter kmlFileTrackImporter = new KmlFileTrackImporter(context, TRACK_ID_0, contentProviderUtils);
-        long trackId = kmlFileTrackImporter.importFile(inputStream);
-
-        // then
-        verify(contentProviderUtils, atLeastOnce()).updateTrack(trackCaptor.capture());
-        Assert.assertEquals(TRACK_ID_0, trackId);
-
-        long time0 = DATE_FORMAT_0.parse(TRACK_TIME_0).getTime();
-        long time1 = DATE_FORMAT_1.parse(TRACK_TIME_1).getTime();
-        long time2 = DATE_FORMAT_1.parse(TRACK_TIME_2).getTime();
-        long time3 = DATE_FORMAT_1.parse(TRACK_TIME_3).getTime();
-        Assert.assertEquals(time1 - time0 + time3 - time2, trackCaptor.getValue().getTrackStatistics().getTotalTime());
-
-        verifyTrack(trackCaptor.getValue(), TRACK_NAME_0, TRACK_DESCRIPTION_0, DATE_FORMAT_0.parse(TRACK_TIME_0).getTime());
-    }
-}

src/androidTest/java/de/dennisguse/opentracks/services/TrackRecordingServiceTest.java

@@ -21,6 +21,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.location.Location;
 import android.os.IBinder;
+import android.os.Looper;
 
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
@@ -33,6 +34,7 @@ import androidx.test.rule.ServiceTestRule;
 import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
+import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -69,10 +71,17 @@ public class TrackRecordingServiceTest {
     @Rule
     public GrantPermissionRule mRuntimePermissionRule = GrantPermissionRule.grant(android.Manifest.permission.ACCESS_FINE_LOCATION);
 
+    @BeforeClass
+    public static void preSetUp() {
+        // Prepare looper for Android's message queue
+        if (Looper.myLooper() == null) Looper.prepare();
+    }
+
+
     private final Context context = ApplicationProvider.getApplicationContext();
     private ContentProviderUtils contentProviderUtils;
 
-    private final long trackId = Math.abs(new Random().nextLong());
+    private final Track.Id trackId = new Track.Id(Math.abs(new Random().nextLong()));
 
     static Intent createStartIntent(Context context) {
         return new Intent(context, TrackRecordingService.class);
@@ -125,7 +134,7 @@ public class TrackRecordingServiceTest {
     @Test
     public void testRecording_noTracks() throws Exception {
         // given
-        List<Track> tracks = contentProviderUtils.getAllTracks();
+        List<Track> tracks = contentProviderUtils.getTracks();
         Assert.assertTrue(tracks.isEmpty());
 
         // when
@@ -136,7 +145,7 @@ public class TrackRecordingServiceTest {
         // then
         // Test if we start in no-recording mode by default.
         Assert.assertFalse(service.isRecording());
-        Assert.assertEquals(-1L, service.getRecordingTrackId());
+        Assert.assertNull(service.getRecordingTrackId());
     }
 
     @MediumTest
@@ -150,7 +159,7 @@ public class TrackRecordingServiceTest {
 
         // then
         Assert.assertFalse(service.isRecording());
-        Assert.assertEquals(PreferencesUtils.RECORDING_TRACK_ID_DEFAULT, service.getRecordingTrackId());
+        Assert.assertNull(service.getRecordingTrackId());
     }
 
     @MediumTest
@@ -234,7 +243,7 @@ public class TrackRecordingServiceTest {
 
         // then
         Assert.assertFalse(service.isRecording());
-        Assert.assertEquals(PreferencesUtils.RECORDING_TRACK_ID_DEFAULT, service.getRecordingTrackId());
+        Assert.assertNull(service.getRecordingTrackId());
     }
 
     @MediumTest
@@ -245,13 +254,13 @@ public class TrackRecordingServiceTest {
         service.startNewTrack();
         Assert.assertTrue(service.isRecording());
 
-        long trackId = service.getRecordingTrackId();
+        Track.Id trackId = service.getRecordingTrackId();
 
         // when
-        long newTrackId = service.startNewTrack();
+        Track.Id newTrackId = service.startNewTrack();
 
         // then
-        Assert.assertEquals(PreferencesUtils.RECORDING_TRACK_ID_DEFAULT, newTrackId);
+        Assert.assertNull(newTrackId);
 
         Assert.assertEquals(trackId, PreferencesUtils.getRecordingTrackId(context));
         Assert.assertEquals(trackId, service.getRecordingTrackId());
@@ -270,7 +279,7 @@ public class TrackRecordingServiceTest {
 
         // then
         Assert.assertFalse(PreferencesUtils.isRecording(context));
-        Assert.assertEquals(PreferencesUtils.RECORDING_TRACK_ID_DEFAULT, service.getRecordingTrackId());
+        Assert.assertNull(service.getRecordingTrackId());
     }
 
     @MediumTest
@@ -281,10 +290,10 @@ public class TrackRecordingServiceTest {
         Assert.assertFalse(service.isRecording());
 
         // when
-        long waypointId = service.insertWaypoint(null, null, null, null);
+        Waypoint.Id waypointId = service.insertWaypoint(null, null, null, null);
 
         // then
-        Assert.assertEquals(-1L, waypointId);
+        Assert.assertNull(waypointId);
     }
 
     @MediumTest
@@ -295,10 +304,10 @@ public class TrackRecordingServiceTest {
         service.startNewTrack();
         Assert.assertTrue(service.isRecording());
         newTrackPoint(service);
-        long trackId = service.getRecordingTrackId();
+        Track.Id trackId = service.getRecordingTrackId();
 
         // when
-        long waypointId = service.insertWaypoint(null, null, null, null);
+        Waypoint.Id waypointId = service.insertWaypoint(null, null, null, null);
 
         // then
         Assert.assertNotEquals(-1L, waypointId);
@@ -313,15 +322,15 @@ public class TrackRecordingServiceTest {
     }
 
     private void addTrack(Track track, boolean isRecording) {
-        Assert.assertTrue(track.getId() >= 0);
+        Assert.assertTrue(track.getId().isValid());
         contentProviderUtils.insertTrack(track);
         Assert.assertEquals(track.getId(), contentProviderUtils.getTrack(track.getId()).getId());
-        PreferencesUtils.setLong(context, R.string.recording_track_id_key, isRecording ? track.getId() : PreferencesUtils.RECORDING_TRACK_ID_DEFAULT);
+        PreferencesUtils.setLong(context, R.string.recording_track_id_key, isRecording ? track.getId().getId() : PreferencesUtils.RECORDING_TRACK_ID_DEFAULT);
         PreferencesUtils.setBoolean(context, R.string.recording_track_paused_key, !isRecording);
     }
 
     // NOTE: Do not use to create a track that is currently recording.
-    private void createDummyTrack(long id, long stopTime, boolean isRecording) {
+    private void createDummyTrack(Track.Id id, long stopTime, boolean isRecording) {
         Track dummyTrack = new Track();
         dummyTrack.setId(id);
         dummyTrack.setName("Dummy Track");

src/androidTest/java/de/dennisguse/opentracks/services/TrackRecordingServiceTestLocation.java

@@ -23,6 +23,7 @@ import java.util.List;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TrackPoint;
 import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
@@ -89,7 +90,7 @@ public class TrackRecordingServiceTestLocation {
     @Test
     public void testOnLocationChangedAsync_movingAccurate() throws Exception {
         // given
-        long trackId = service.startNewTrack();
+        Track.Id trackId = service.startNewTrack();
 
         // when
         TrackRecordingServiceTest.newTrackPoint(service, 45.0, 35.0, 5, 15);
@@ -113,7 +114,7 @@ public class TrackRecordingServiceTestLocation {
     @Test
     public void testOnLocationChangedAsync_slowMovingAccurate() throws Exception {
         // given
-        long trackId = service.startNewTrack();
+        Track.Id trackId = service.startNewTrack();
 
         // when
         TrackRecordingServiceTest.newTrackPoint(service, 45.0, 35.0, 5, 15);
@@ -155,7 +156,7 @@ public class TrackRecordingServiceTestLocation {
     @Test
     public void testOnLocationChangedAsync_idle() throws Exception {
         // given
-        long trackId = service.startNewTrack();
+        Track.Id trackId = service.startNewTrack();
 
         // when
         TrackRecordingServiceTest.newTrackPoint(service, 45.0, 35.0, 1, 0);
@@ -181,7 +182,7 @@ public class TrackRecordingServiceTestLocation {
     @Test
     public void testOnLocationChangedAsync_idle_withMovement() throws Exception {
         // given
-        long trackId = service.startNewTrack();
+        Track.Id trackId = service.startNewTrack();
 
         // when
         TrackRecordingServiceTest.newTrackPoint(service, 45.0, 35.0, 1, 15);
@@ -209,7 +210,7 @@ public class TrackRecordingServiceTestLocation {
     @Test
     public void testOnLocationChangedAsync_idle_withSensorData() throws Exception {
         // given
-        long trackId = service.startNewTrack();
+        Track.Id trackId = service.startNewTrack();
 
         service.setRemoteSensorManager(new BluetoothRemoteSensorManager(context) {
 
@@ -253,7 +254,7 @@ public class TrackRecordingServiceTestLocation {
     @Test
     public void testOnLocationChangedAsync_segment() throws Exception {
         // given
-        long trackId = service.startNewTrack();
+        Track.Id trackId = service.startNewTrack();
 
         // when
         TrackRecordingServiceTest.newTrackPoint(service, 45.0, 35.0, 1, 0);

src/androidTest/java/de/dennisguse/opentracks/services/TrackRecordingServiceTestLooper.java

@@ -187,7 +187,7 @@ public class TrackRecordingServiceTestLooper {
     @MediumTest
     @Test
     public void testIntegration_completeRecordingSession() throws TimeoutException {
-        List<Track> tracks = contentProviderUtils.getAllTracks();
+        List<Track> tracks = contentProviderUtils.getTracks();
         Assert.assertTrue(tracks.isEmpty());
         fullRecordingSession();
     }
@@ -197,14 +197,14 @@ public class TrackRecordingServiceTestLooper {
         Assert.assertFalse(service.isRecording());
 
         // Start a track.
-        long id = service.startNewTrack();
+        Track.Id trackId = service.startNewTrack();
-        Assert.assertTrue(id >= 0);
+        Assert.assertTrue(trackId.isValid());
         Assert.assertTrue(service.isRecording());
-        Track track = contentProviderUtils.getTrack(id);
+        Track track = contentProviderUtils.getTrack(trackId);
         Assert.assertNotNull(track);
-        Assert.assertEquals(id, track.getId());
+        Assert.assertEquals(trackId, track.getId());
-        Assert.assertEquals(id, PreferencesUtils.getRecordingTrackId(context));
+        Assert.assertEquals(trackId, PreferencesUtils.getRecordingTrackId(context));
-        Assert.assertEquals(id, service.getRecordingTrackId());
+        Assert.assertEquals(trackId, service.getRecordingTrackId());
 
         // Insert a few points, markers and statistics.
         long startTime = System.currentTimeMillis();
@@ -228,10 +228,10 @@ public class TrackRecordingServiceTestLooper {
         // Stop the track. Validate if it has correct data.
         service.endCurrentTrack();
         Assert.assertFalse(service.isRecording());
-        Assert.assertEquals(-1L, service.getRecordingTrackId());
+        Assert.assertNull(service.getRecordingTrackId());
-        track = contentProviderUtils.getTrack(id);
+        track = contentProviderUtils.getTrack(trackId);
         Assert.assertNotNull(track);
-        Assert.assertEquals(id, track.getId());
+        Assert.assertEquals(trackId, track.getId());
         TrackStatistics trackStatistics = track.getTrackStatistics();
         Assert.assertNotNull(trackStatistics);
         Assert.assertTrue(trackStatistics.getStartTime_ms() > 0);

src/androidTest/java/de/dennisguse/opentracks/util/StringUtilsTest.java

@@ -212,4 +212,16 @@ public class StringUtilsTest {
 
         Assert.assertEquals("1", StringUtils.formatDecimal(0.99, 1));
     }
+
+    @Test
+    public void testGetSpeedParts() {
+        Assert.assertEquals("4:59", StringUtils.getSpeedParts(context, 3.34, true, false).first);
+        Assert.assertEquals("5:00", StringUtils.getSpeedParts(context, 3.33, true, false).first);
+
+        Assert.assertEquals("11.99", StringUtils.getSpeedParts(context, 3.33, true, true).first);
+        Assert.assertEquals("7.45", StringUtils.getSpeedParts(context, 3.33, false, true).first);
+
+        Assert.assertEquals("min/km", StringUtils.getSpeedParts(context, 0, true, false).second);
+        Assert.assertEquals("min/mi", StringUtils.getSpeedParts(context, 0, false, false).second);
+    }
 }

src/androidTest/java/de/dennisguse/opentracks/util/TrackNameUtilsTest.java

@@ -30,6 +30,7 @@ import java.util.Date;
 import java.util.Locale;
 
 import de.dennisguse.opentracks.R;
+import de.dennisguse.opentracks.content.data.Track;
 
 /**
  * Tests {@link TrackNameUtils}.
@@ -39,7 +40,7 @@ import de.dennisguse.opentracks.R;
 @RunWith(AndroidJUnit4.class)
 public class TrackNameUtilsTest {
 
-    private static final long TRACK_ID = 1L;
+    private static final Track.Id TRACK_ID = new Track.Id(1L);
     private static final long START_TIME = 1288213406000L;
 
     private static final Context CONTEXT = ApplicationProvider.getApplicationContext();
@@ -69,6 +70,6 @@ public class TrackNameUtilsTest {
     @Test
     public void testTrackName_number() {
         PreferencesUtils.setString(CONTEXT, R.string.track_name_key, CONTEXT.getString(R.string.settings_recording_track_name_number_value));
-        Assert.assertEquals("Track " + TRACK_ID, TrackNameUtils.getTrackName(CONTEXT, TRACK_ID, START_TIME));
+        Assert.assertEquals("Track " + TRACK_ID.getId(), TrackNameUtils.getTrackName(CONTEXT, TRACK_ID, START_TIME));
     }
 }

src/debug/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/ic_launcher_debug_background" />
+    <background android:drawable="@color/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_logo_color_108dp" />
 </adaptive-icon>

src/debug/res/values/ic_launcher_background.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="ic_launcher_debug_background">#8F0000</color>
+    <color name="ic_launcher_background">#8F0000</color>
 </resources>

src/debug/res/values/strings.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?><!--
-Copyright 2013 Google Inc.
+Copyright 2010 Google Inc.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -13,7 +13,6 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 -->
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
+<resources>
-    <item android:drawable="@drawable/ic_button_stop_pressed" android:state_pressed="true" />
+    <string name="app_name">OpenTracks (Debug)</string>
-    <item android:drawable="@drawable/ic_button_stop" />
+</resources>
-</selector>

src/main/AndroidManifest.xml

@@ -43,6 +43,7 @@ limitations under the License.
 
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.VIBRATE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
@@ -52,8 +53,8 @@ limitations under the License.
         android:allowBackup="false"
         android:hasFragileUserData="true"
         android:hardwareAccelerated="true"
-        android:icon="${applicationLogo}"
+        android:icon="@mipmap/ic_launcher"
-        android:label="${applicationName}"
+        android:label="@string/app_name"
         android:theme="@style/ThemeCustom">
 
         <activity android:name=".AboutActivity" />
@@ -75,42 +76,32 @@ limitations under the License.
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />
                 <category android:name="android.intent.category.DEFAULT" />
-
+                <data android:mimeType="application/vnd.google-earth.kmz" />
                 <data
+                    android:scheme="content"
                     android:host="*"
-                    android:mimeType="application/vnd.google-earth.kmz" />
-                <data
-                    android:host="*"
-                    android:mimeType="*/*"
                     android:pathPattern="*kmz" />
             </intent-filter>
 
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />
                 <category android:name="android.intent.category.DEFAULT" />
-
+                <data android:mimeType="application/vnd.google-earth.kml+xml" />
                 <data
+                    android:scheme="content"
                     android:host="*"
-                    android:mimeType="application/vnd.google-earth.kml+xml" />
-                <data
-                    android:host="*"
-                    android:mimeType="*/*"
                     android:pathPattern="*kml" />
             </intent-filter>
 
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />
                 <category android:name="android.intent.category.DEFAULT" />
-
+                <data android:mimeType="application/gpx+xml" />
                 <data
+                    android:scheme="content"
                     android:host="*"
-                    android:mimeType="application/gpx+xml" />
-                <data
-                    android:host="*"
-                    android:mimeType="*/*"
                     android:pathPattern="*gpx" />
             </intent-filter>
-
         </activity>
 
         <activity android:name=".MarkerDetailActivity">

src/main/java/de/dennisguse/opentracks/AboutActivity.java

@@ -2,7 +2,6 @@ package de.dennisguse.opentracks;
 
 import android.os.Bundle;
 import android.view.Menu;
-import android.view.ViewGroup;
 import android.widget.TextView;
 
 import androidx.annotation.Nullable;
@@ -30,7 +29,7 @@ public class AboutActivity extends AbstractActivity {
         TextView textURL = findViewById(R.id.about_app_url);
         textURL.setText(getString(R.string.about_url, getString(R.string.app_web_url)));
 
-        ViewUtils.makeClickableLinks((ViewGroup) findViewById(android.R.id.content));
+        ViewUtils.makeClickableLinks(findViewById(android.R.id.content));
     }
 
     protected int getLayoutResId() {

src/main/java/de/dennisguse/opentracks/AbstractListActivity.java

@@ -18,6 +18,10 @@ package de.dennisguse.opentracks;
 
 import android.content.Intent;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.fragments.ConfirmDeleteDialogFragment;
 import de.dennisguse.opentracks.fragments.ConfirmDeleteDialogFragment.ConfirmDeleteCaller;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
@@ -55,17 +59,17 @@ public abstract class AbstractListActivity extends AbstractActivity implements C
      *
      * @param trackIds the track ids
      */
-    protected void deleteTracks(long[] trackIds) {
+    protected void deleteTracks(Track.Id... trackIds) {
         ConfirmDeleteDialogFragment.showDialog(getSupportFragmentManager(), trackIds);
     }
 
     @Override
-    public void onConfirmDeleteDone(long[] trackIds) {
+    public void onConfirmDeleteDone(Track.Id... trackIds) {
         boolean stopRecording = false;
 
-        long recordingTrackId = PreferencesUtils.getRecordingTrackId(this);
+        Track.Id recordingTrackId = PreferencesUtils.getRecordingTrackId(this);
-        for (long trackId : trackIds) {
+        for (Track.Id trackId : trackIds) {
-            if (trackId == recordingTrackId) {
+            if (trackId.equals(recordingTrackId)) {
                 stopRecording = true;
                 break;
             }
@@ -75,7 +79,7 @@ public abstract class AbstractListActivity extends AbstractActivity implements C
             getTrackRecordingServiceConnection().stopRecording(this, false);
         }
         Intent intent = IntentUtils.newIntent(this, TrackDeleteActivity.class);
-        intent.putExtra(TrackDeleteActivity.EXTRA_TRACK_IDS, trackIds);
+        intent.putParcelableArrayListExtra(TrackDeleteActivity.EXTRA_TRACK_IDS, new ArrayList<>(Arrays.asList(trackIds)));
         startActivityForResult(intent, DELETE_REQUEST_CODE);
         overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
     }

src/main/java/de/dennisguse/opentracks/HelpActivity.java

@@ -1,7 +1,6 @@
 package de.dennisguse.opentracks;
 
 import android.os.Bundle;
-import android.view.ViewGroup;
 
 import androidx.annotation.Nullable;
 
@@ -12,7 +11,7 @@ public class HelpActivity extends AbstractActivity {
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        ViewUtils.makeClickableLinks((ViewGroup) findViewById(android.R.id.content));
+        ViewUtils.makeClickableLinks(findViewById(android.R.id.content));
     }
 
     @Override

src/main/java/de/dennisguse/opentracks/MarkerDetailActivity.java

@@ -48,32 +48,33 @@ public class MarkerDetailActivity extends AbstractActivity implements DeleteMark
 
     private static final String TAG = MarkerDetailActivity.class.getSimpleName();
 
-    private List<Long> markerIds;
+    private List<Waypoint.Id> waypointIds;
 
     @Override
     protected void onCreate(Bundle bundle) {
         super.onCreate(bundle);
 
-        long markerId = getIntent().getLongExtra(EXTRA_MARKER_ID, -1L);
+        Waypoint.Id waypointId = getIntent().getParcelableExtra(EXTRA_MARKER_ID);
-        if (markerId == -1L) {
+        if (waypointId == null) {
             Log.d(TAG, "invalid marker id");
             finish();
             return;
         }
 
         ContentProviderUtils contentProviderUtils = new ContentProviderUtils(this);
-        Waypoint waypoint = contentProviderUtils.getWaypoint(markerId);
+        Waypoint waypoint = contentProviderUtils.getWaypoint(waypointId);
 
-        markerIds = new ArrayList<>();
+        waypointIds = new ArrayList<>();
         int markerIndex = -1;
 
-        try (Cursor cursor = contentProviderUtils.getWaypointCursor(waypoint.getTrackId(), -1L, -1)) {
+        //TODO Load only waypointIds, not the whole waypoint
+        try (Cursor cursor = contentProviderUtils.getWaypointCursor(waypoint.getTrackId(), null, -1)) {
             if (cursor != null && cursor.moveToFirst()) {
                 for (int i = 0; i < cursor.getCount(); i++) {
                     Waypoint currentMarker = contentProviderUtils.createWaypoint(cursor);
-                    markerIds.add(currentMarker.getId());
+                    waypointIds.add(currentMarker.getId());
-                    if (currentMarker.getId() == markerId) {
+                    if (waypointId.equals(currentMarker.getId())) {
-                        markerIndex = markerIds.size() - 1;
+                        markerIndex = waypointIds.size() - 1;
                     }
 
                     cursor.moveToNext();
@@ -126,7 +127,7 @@ public class MarkerDetailActivity extends AbstractActivity implements DeleteMark
         @Override
         @NonNull
         public Fragment getItem(int position) {
-            return MarkerDetailFragment.newInstance(markerIds.get(position));
+            return MarkerDetailFragment.newInstance(waypointIds.get(position));
         }
 
         @Nullable
@@ -137,7 +138,7 @@ public class MarkerDetailActivity extends AbstractActivity implements DeleteMark
 
         @Override
         public int getCount() {
-            return markerIds.size();
+            return waypointIds.size();
         }
     }
 }

src/main/java/de/dennisguse/opentracks/MarkerEditActivity.java

@@ -42,6 +42,7 @@ import java.io.File;
 import java.io.FileDescriptor;
 import java.io.IOException;
 
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
@@ -64,7 +65,7 @@ public class MarkerEditActivity extends AbstractActivity {
     private static final int GALLERY_IMG_REQUEST_CODE = 7;
 
     private static final String TAG = MarkerEditActivity.class.getSimpleName();
-    private long trackId;
+    private Track.Id trackId;
     private TrackRecordingServiceConnection trackRecordingServiceConnection = new TrackRecordingServiceConnection();
     private Waypoint waypoint;
 
@@ -85,8 +86,8 @@ public class MarkerEditActivity extends AbstractActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        trackId = getIntent().getLongExtra(EXTRA_TRACK_ID, -1L);
+        trackId = getIntent().getParcelableExtra(EXTRA_TRACK_ID);
-        long markerId = getIntent().getLongExtra(EXTRA_MARKER_ID, -1L);
+        Waypoint.Id waypointId = getIntent().getParcelableExtra(EXTRA_MARKER_ID);
 
         hasCamera = getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY);
 
@@ -111,7 +112,7 @@ public class MarkerEditActivity extends AbstractActivity {
         Button cancel = findViewById(R.id.marker_edit_cancel);
         cancel.setOnClickListener(v -> finish());
 
-        final boolean isNewMarker = markerId == -1L;
+        final boolean isNewMarker = waypointId == null;
 
         setTitle(isNewMarker ? R.string.menu_insert_marker : R.string.menu_edit);
         Button done = findViewById(R.id.marker_edit_done);
@@ -126,7 +127,7 @@ public class MarkerEditActivity extends AbstractActivity {
         });
 
         if (isNewMarker) {
-            int nextWaypointNumber = trackId == -1L ? -1 : new ContentProviderUtils(this).getNextWaypointNumber(trackId);
+            int nextWaypointNumber = trackId == null ? -1 : new ContentProviderUtils(this).getNextWaypointNumber(trackId);
             if (nextWaypointNumber == -1) {
                 nextWaypointNumber = 0;
             }
@@ -135,7 +136,7 @@ public class MarkerEditActivity extends AbstractActivity {
             waypointMarkerType.setText("");
             waypointDescription.setText("");
         } else {
-            waypoint = new ContentProviderUtils(this).getWaypoint(markerId);
+            waypoint = new ContentProviderUtils(this).getWaypoint(waypointId);
             if (waypoint == null) {
                 Log.d(TAG, "waypoint is null");
                 finish();
@@ -151,6 +152,9 @@ public class MarkerEditActivity extends AbstractActivity {
 
         if (savedInstanceState != null) {
             photoUri = savedInstanceState.getParcelable(BUNDLE_PHOTO_URI);
+            if (waypoint != null) {
+                waypoint.setPhotoUrl(photoUri != null ? photoUri.toString() : null);
+            }
         }
         if (photoUri != null) {
             setWaypointImageView(photoUri);
@@ -257,8 +261,8 @@ public class MarkerEditActivity extends AbstractActivity {
     /**
      * Returns the trackId. If trackId == -1 then get it from waypoint object.
      */
-    private long getTrackId() {
+    private Track.Id getTrackId() {
-        return trackId == -1 ? waypoint.getTrackId() : trackId;
+        return trackId == null ? waypoint.getTrackId() : trackId;
     }
 
     /**

src/main/java/de/dennisguse/opentracks/MarkerListActivity.java

@@ -32,10 +32,10 @@ import androidx.annotation.NonNull;
 import androidx.cursoradapter.widget.ResourceCursorAdapter;
 import androidx.loader.app.LoaderManager;
 import androidx.loader.app.LoaderManager.LoaderCallbacks;
-import androidx.loader.content.CursorLoader;
 import androidx.loader.content.Loader;
 
 import de.dennisguse.opentracks.content.data.Track;
+import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.data.WaypointsColumns;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.fragments.DeleteMarkerDialogFragment;
@@ -57,16 +57,11 @@ public class MarkerListActivity extends AbstractActivity implements DeleteMarker
 
     private static final String TAG = MarkerListActivity.class.getSimpleName();
 
-    private static final String[] PROJECTION = new String[]{WaypointsColumns._ID,
-            WaypointsColumns.NAME, WaypointsColumns.DESCRIPTION, WaypointsColumns.CATEGORY,
-            WaypointsColumns.TIME, WaypointsColumns.PHOTOURL,
-            WaypointsColumns.LATITUDE, WaypointsColumns.LONGITUDE};
-
     private ContentProviderUtils contentProviderUtils;
 
     private SharedPreferences sharedPreferences;
 
-    private long recordingTrackId = PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+    private Track.Id recordingTrackId;
     private boolean recordingTrackPaused;
 
     private final OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
@@ -117,19 +112,19 @@ public class MarkerListActivity extends AbstractActivity implements DeleteMarker
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);
-        long trackId = getIntent().getLongExtra(EXTRA_TRACK_ID, -1L);
+        Track.Id trackId = getIntent().getParcelableExtra(EXTRA_TRACK_ID);
         recordingTrackPaused = PreferencesUtils.isRecordingTrackPausedDefault(this);
 
         contentProviderUtils = new ContentProviderUtils(this);
         sharedPreferences = PreferencesUtils.getSharedPreferences(this);
 
-        track = trackId != -1L ? contentProviderUtils.getTrack(trackId) : null;
+        track = trackId != null ? contentProviderUtils.getTrack(trackId) : null;
 
         listView = findViewById(R.id.marker_list);
         listView.setEmptyView(findViewById(R.id.marker_list_empty));
         listView.setOnItemClickListener((parent, view, position, id) -> {
             Intent intent = IntentUtils.newIntent(MarkerListActivity.this, MarkerDetailActivity.class)
-                    .putExtra(MarkerDetailActivity.EXTRA_MARKER_ID, id);
+                    .putExtra(MarkerDetailActivity.EXTRA_MARKER_ID, new Waypoint.Id(id));
             startActivity(intent);
         });
         resourceCursorAdapter = new ResourceCursorAdapter(this, R.layout.list_item, null, 0) {
@@ -163,14 +158,7 @@ public class MarkerListActivity extends AbstractActivity implements DeleteMarker
             @NonNull
             @Override
             public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
-                if (track != null) {
+                return ContentProviderUtils.getWaypointsLoader(MarkerListActivity.this, track != null ? track.getId() : null);
-                    return new CursorLoader(MarkerListActivity.this, WaypointsColumns.CONTENT_URI, PROJECTION,
-                            WaypointsColumns.TRACKID + "=?",
-                            new String[]{String.valueOf(track.getId())}, null);
-                } else {
-                    return new CursorLoader(MarkerListActivity.this, WaypointsColumns.CONTENT_URI, PROJECTION,
-                            null, null, null);
-                }
             }
 
             @Override
@@ -223,7 +211,7 @@ public class MarkerListActivity extends AbstractActivity implements DeleteMarker
 
     @Override
     public boolean onPrepareOptionsMenu(Menu menu) {
-        insertMarkerMenuItem.setVisible(track != null && track.getId() == recordingTrackId && !recordingTrackPaused);
+        insertMarkerMenuItem.setVisible(track != null && track.getId().equals(recordingTrackId) && !recordingTrackPaused);
         return super.onPrepareOptionsMenu(menu);
     }
 
@@ -242,29 +230,34 @@ public class MarkerListActivity extends AbstractActivity implements DeleteMarker
      * Handles a context item selection.
      *
      * @param itemId          the menu item id
-     * @param markerIds the marker ids
+     * @param longWaypointIds the marker ids
      * @return true if handled.
      */
-    private boolean handleContextItem(int itemId, long[] markerIds) {
+    private boolean handleContextItem(int itemId, long... longWaypointIds) {
+        Waypoint.Id[] waypointIds = new Waypoint.Id[longWaypointIds.length];
+        for (int i = 0; i < longWaypointIds.length; i++) {
+            waypointIds[i] = new Waypoint.Id(longWaypointIds[i]);
+        }
+
         Intent intent;
         switch (itemId) {
             case R.id.list_context_menu_show_on_map:
-                if (markerIds.length == 1) {
+                if (waypointIds.length == 1) {
-                    IntentUtils.showCoordinateOnMap(this, contentProviderUtils.getWaypoint(markerIds[0]));
+                    IntentUtils.showCoordinateOnMap(this, contentProviderUtils.getWaypoint(waypointIds[0]));
                 }
                 return true;
             case R.id.list_context_menu_edit:
-                if (markerIds.length == 1) {
+                if (waypointIds.length == 1) {
                     intent = IntentUtils.newIntent(this, MarkerEditActivity.class)
-                            .putExtra(MarkerEditActivity.EXTRA_MARKER_ID, markerIds[0]);
+                            .putExtra(MarkerEditActivity.EXTRA_MARKER_ID, waypointIds[0]);
                     startActivity(intent);
                 }
                 return true;
             case R.id.list_context_menu_delete:
-                if (markerIds.length > 1 && markerIds.length == listView.getCount()) {
+                if (waypointIds.length > 1 && waypointIds.length == listView.getCount()) {
-                    markerIds = new long[]{-1L};
+                    waypointIds = null;
                 }
-                DeleteMarkerDialogFragment.showDialog(getSupportFragmentManager(), markerIds);
+                DeleteMarkerDialogFragment.showDialog(getSupportFragmentManager(), waypointIds);
                 return true;
             case R.id.list_context_menu_select_all:
                 for (int i = 0; i < listView.getCount(); i++) {

src/main/java/de/dennisguse/opentracks/SearchListActivity.java

@@ -97,7 +97,7 @@ public class SearchListActivity extends AbstractListActivity implements DeleteMa
 
     private boolean metricUnits = true;
 
-    private long recordingTrackId = PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+    private Track.Id recordingTrackId;
 
     private boolean recordingTrackPaused;
 
@@ -165,7 +165,7 @@ public class SearchListActivity extends AbstractListActivity implements DeleteMa
 
         contentProviderUtils = new ContentProviderUtils(this);
         sharedPreferences = PreferencesUtils.getSharedPreferences(this);
-        trackRecordingServiceConnection = new TrackRecordingServiceConnection(null);
+        trackRecordingServiceConnection = new TrackRecordingServiceConnection();
         searchEngine = new SearchEngine(contentProviderUtils);
 
         arrayAdapter = new ArrayAdapter<Map<String, Object>>(this, R.layout.list_item, R.id.list_item_name) {
@@ -203,7 +203,7 @@ public class SearchListActivity extends AbstractListActivity implements DeleteMa
         listView.setEmptyView(findViewById(R.id.search_list_empty));
         listView.setOnItemClickListener((parent, view, position, id) -> {
             Map<String, Object> item = arrayAdapter.getItem(position);
-            Long trackId = (Long) item.get(TRACK_ID_FIELD);
+            Track.Id trackId = (Track.Id) item.get(TRACK_ID_FIELD);
             Long markerId = (Long) item.get(MARKER_ID_FIELD);
             Intent intent = IntentUtils.newIntent(SearchListActivity.this, TrackRecordedActivity.class);
             if (markerId != null) {
@@ -270,22 +270,22 @@ public class SearchListActivity extends AbstractListActivity implements DeleteMa
             return false;
         }
         Map<String, Object> item = arrayAdapter.getItem(positions[0]);
-        Long trackId = (Long) item.get(TRACK_ID_FIELD);
+        Track.Id trackId = (Track.Id) item.get(TRACK_ID_FIELD);
-        Long markerId = (Long) item.get(MARKER_ID_FIELD);
+        Waypoint.Id waypointId = (Waypoint.Id) item.get(MARKER_ID_FIELD);
         Intent intent;
         switch (itemId) {
             case R.id.list_context_menu_show_on_map:
                 IntentUtils.showCoordinateOnMap(this, (double) item.get(MARKER_LATITUDE_FIELD), (double) item.get(MARKER_LONGITUDE_FIELD), item.get(NAME_FIELD) + "");
                 return true;
             case R.id.list_context_menu_share:
-                intent = IntentUtils.newShareFileIntent(this, new long[]{trackId});
+                intent = IntentUtils.newShareFileIntent(this, trackId);
                 intent = Intent.createChooser(intent, null);
                 startActivity(intent);
                 return true;
             case R.id.list_context_menu_edit:
-                if (markerId != null) {
+                if (waypointId != null) {
                     intent = IntentUtils.newIntent(this, MarkerEditActivity.class)
-                            .putExtra(MarkerEditActivity.EXTRA_MARKER_ID, markerId);
+                            .putExtra(MarkerEditActivity.EXTRA_MARKER_ID, waypointId);
                 } else {
                     intent = IntentUtils.newIntent(this, TrackEditActivity.class)
                             .putExtra(TrackEditActivity.EXTRA_TRACK_ID, trackId);
@@ -296,10 +296,10 @@ public class SearchListActivity extends AbstractListActivity implements DeleteMa
                 finish();
                 return true;
             case R.id.list_context_menu_delete:
-                if (markerId != null) {
+                if (waypointId != null) {
-                    DeleteMarkerDialogFragment.showDialog(getSupportFragmentManager(), new long[]{markerId});
+                    DeleteMarkerDialogFragment.showDialog(getSupportFragmentManager(), waypointId);
                 } else {
-                    deleteTracks(new long[]{trackId});
+                    deleteTracks(trackId);
                 }
                 return true;
             default:
@@ -331,7 +331,7 @@ public class SearchListActivity extends AbstractListActivity implements DeleteMa
      * @param textQuery the query
      */
     private void doSearch(String textQuery) {
-        SearchQuery query = new SearchQuery(textQuery, null, -1L, System.currentTimeMillis());
+        SearchQuery query = new SearchQuery(textQuery, null, null, System.currentTimeMillis());
         SortedSet<ScoredResult> scoredResults = searchEngine.search(query);
         final List<Map<String, Object>> displayResults = prepareResultsforDisplay(scoredResults);
 
@@ -372,8 +372,8 @@ public class SearchListActivity extends AbstractListActivity implements DeleteMa
 
         //TODO: It may be more appropriate to obtain the track name as a join in the retrieval phase of the searchable.
         String trackName = null;
-        long trackId = waypoint.getTrackId();
+        Track.Id trackId = waypoint.getTrackId();
-        if (trackId != -1L) {
+        if (!trackId.isValid()) {
             Track track = contentProviderUtils.getTrack(trackId);
             if (track != null) {
                 trackName = track.getName();

src/main/java/de/dennisguse/opentracks/ShowOnMapProxyActivity.java

@@ -8,6 +8,9 @@ import android.util.Pair;
 
 import androidx.appcompat.app.AppCompatActivity;
 
+import java.util.Set;
+
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.provider.ShareContentProvider;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
@@ -26,7 +29,7 @@ public abstract class ShowOnMapProxyActivity extends AppCompatActivity {
 
     protected void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        long[] trackIds = IntentDashboardUtils.extractTrackIdsFromIntent(getIntent());
+        Set<Track.Id> trackIds = IntentDashboardUtils.extractTrackIdsFromIntent(getIntent());
 
         showTrackTrackfileFormat(this, trackFileFormat, trackIds);
 
@@ -39,14 +42,14 @@ public abstract class ShowOnMapProxyActivity extends AppCompatActivity {
      * @param context  the context
      * @param trackIds the track ids
      */
-    private static void showTrackTrackfileFormat(Context context, TrackFileFormat trackFileFormat, long[] trackIds) {
+    private static void showTrackTrackfileFormat(Context context, TrackFileFormat trackFileFormat, Set<Track.Id> trackIds) {
-        if (trackIds.length == 0) {
+        if (trackIds.size() == 0) {
             return;
         }
 
         Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
         intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-        intent.putExtra(TrackPointsColumns.TRACKID, trackIds[0]);
+        intent.putExtra(TrackPointsColumns.TRACKID, trackIds.toArray(new Track.Id[0])[0]);
         Pair<Uri, String> uriAndMime = ShareContentProvider.createURI(trackIds, "SharingTrack", trackFileFormat);
         intent.setDataAndType(uriAndMime.first, uriAndMime.second);
 

src/main/java/de/dennisguse/opentracks/Startup.java

@@ -32,6 +32,11 @@ public class Startup extends Application {
             PreferencesUtils.setString(this, R.string.stats_units_key, statsUnits);
         }
 
+        //TODO Workaround to reset recordingTrackId on app startup as the TrackRecordingService (likely) crashed.
+        if (PreferencesUtils.isRecording(this)) {
+            Log.e(TAG, "Reset recordingTrackId; likely the TrackRecordingService crashed.");
+            PreferencesUtils.setLong(this, R.string.recording_track_id_key, PreferencesUtils.RECORDING_TRACK_ID_DEFAULT);
+        }
 
         //In debug builds: show thread and VM warnings.
         if (BuildConfig.DEBUG) {

src/main/java/de/dennisguse/opentracks/TrackController.java

@@ -16,15 +16,24 @@
 
 package de.dennisguse.opentracks;
 
+import android.annotation.SuppressLint;
 import android.app.Activity;
+import android.graphics.drawable.AnimatedVectorDrawable;
+import android.graphics.drawable.Drawable;
 import android.os.Handler;
+import android.view.Gravity;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.ImageButton;
 import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.core.content.ContextCompat;
 
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
 import de.dennisguse.opentracks.services.TrackRecordingServiceInterface;
+import de.dennisguse.opentracks.util.ActivityUtils;
 import de.dennisguse.opentracks.util.StringUtils;
 import de.dennisguse.opentracks.util.UnitConversions;
 
@@ -46,6 +55,7 @@ public class TrackController {
     private final ImageButton recordImageButton;
     private final ImageButton stopImageButton;
     private final boolean alwaysShow;
+    private ButtonDelay buttonDelay;
 
     private boolean isRecording;
     private boolean isPaused;
@@ -65,6 +75,7 @@ public class TrackController {
         }
     };
 
+    @SuppressLint("ClickableViewAccessibility")
     TrackController(Activity activity, TrackRecordingServiceConnection trackRecordingServiceConnection, boolean alwaysShow, OnClickListener recordListener, OnClickListener stopListener) {
         this.activity = activity;
         this.trackRecordingServiceConnection = trackRecordingServiceConnection;
@@ -75,10 +86,91 @@ public class TrackController {
         totalTimeTextView = activity.findViewById(R.id.track_controller_total_time);
 
         recordImageButton = activity.findViewById(R.id.track_controller_record);
-        recordImageButton.setOnClickListener(recordListener);
+        recordImageButton.setOnTouchListener((view, motionEvent) -> onRecordTouch(activity, recordListener, motionEvent));
 
         stopImageButton = activity.findViewById(R.id.track_controller_stop);
-        stopImageButton.setOnClickListener(stopListener);
+        stopImageButton.setOnTouchListener((view, motionEvent) -> onStopTouch(activity, stopListener, motionEvent));
+    }
+
+    private boolean onRecordTouch(final Activity activity, final OnClickListener recordListener, final MotionEvent motionEvent) {
+        if (isRecording && !isPaused) {
+            if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
+                buttonDelay = new ButtonDelay(activity, recordImageButton, R.drawable.ic_button_pause_anim, R.string.hold_to_pause, recordListener);
+                new Thread(buttonDelay).start();
+                return true;
+            } else if (motionEvent.getAction() == MotionEvent.ACTION_UP ) {
+                recordImageButton.setImageResource(R.drawable.ic_button_pause);
+                if (buttonDelay != null) {
+                    buttonDelay.canceled = true;
+                }
+                return true;
+            }
+        } else if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
+            recordListener.onClick(null);
+            return true;
+        }
+        return false;
+    }
+
+    private boolean onStopTouch(final Activity activity, final OnClickListener stopListener, final MotionEvent motionEvent) {
+        if (isRecording) {
+            if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
+                buttonDelay = new ButtonDelay(activity, stopImageButton, R.drawable.ic_button_stop_anim, R.string.hold_to_stop, stopListener);
+                new Thread(buttonDelay).start();
+                return true;
+            } else if (motionEvent.getAction() == MotionEvent.ACTION_UP ) {
+                stopImageButton.setImageResource(R.drawable.ic_button_stop);
+                if (buttonDelay != null) {
+                    buttonDelay.canceled = true;
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static class ButtonDelay implements Runnable {
+
+        private boolean canceled = false;
+
+        private final ImageButton imageButton;
+        private final Activity activity;
+        private final OnClickListener clickListener;
+        private final int delayMillis;
+        private final Drawable drawable;
+        private final int delayMessageId;
+
+        private ButtonDelay(final Activity activity, final ImageButton imageButton, final int animDrawableId, final int delayMessageId, final OnClickListener clickListener) {
+            this.activity = activity;
+            this.clickListener = clickListener;
+            this.delayMillis = activity.getResources().getInteger(R.integer.buttonDelayMillis);
+            this.imageButton = imageButton;
+            this.drawable = ContextCompat.getDrawable(activity, animDrawableId);
+            this.delayMessageId = delayMessageId;
+        }
+
+        @Override
+        public void run() {
+            activity.runOnUiThread(()->{
+                imageButton.setImageDrawable(drawable);
+                if (drawable instanceof AnimatedVectorDrawable) {
+                    ((AnimatedVectorDrawable) drawable).start();
+                }
+                ActivityUtils.vibrate(activity, 150);
+                ActivityUtils.toast(activity, delayMessageId, Toast.LENGTH_SHORT, Gravity.TOP);
+            });
+
+            try {
+                Thread.sleep(delayMillis);
+            } catch (InterruptedException ignored) {
+            }
+            if (!canceled) {
+                activity.runOnUiThread(()-> {
+                    clickListener.onClick(null);
+                    ActivityUtils.vibrate(activity, 1000);
+                });
+            }
+        }
     }
 
     public void update(boolean recording, boolean paused) {
@@ -95,10 +187,10 @@ public class TrackController {
             return;
         }
 
-        recordImageButton.setImageResource(isRecording && !isPaused ? R.drawable.button_pause : R.drawable.button_record);
+        recordImageButton.setImageResource(isRecording && !isPaused ? R.drawable.ic_button_pause : R.drawable.button_record);
         recordImageButton.setContentDescription(activity.getString(isRecording && !isPaused ? R.string.image_pause : R.string.image_record));
 
-        stopImageButton.setImageResource(isRecording ? R.drawable.button_stop : R.drawable.ic_button_stop_disabled);
+        stopImageButton.setImageResource(isRecording ? R.drawable.ic_button_stop : R.drawable.ic_button_stop_disabled);
         stopImageButton.setEnabled(isRecording);
 
         statusTextView.setVisibility(isRecording ? View.VISIBLE : View.INVISIBLE);

src/main/java/de/dennisguse/opentracks/TrackDeleteActivity.java

@@ -21,6 +21,9 @@ import android.os.Bundle;
 import android.os.PowerManager;
 import android.view.View;
 
+import java.util.List;
+
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.util.SystemUtils;
 
@@ -33,7 +36,7 @@ public class TrackDeleteActivity extends AbstractActivity {
 
     public static final String EXTRA_TRACK_IDS = "track_ids";
 
-    private long[] trackIds;
+    private List<Track.Id> trackIds;
 
     private Thread deleteThread;
 
@@ -44,13 +47,13 @@ public class TrackDeleteActivity extends AbstractActivity {
         setResult(RESULT_CANCELED);
 
         Intent intent = getIntent();
-        trackIds = intent.getLongArrayExtra(EXTRA_TRACK_IDS);
+        trackIds = intent.getParcelableArrayListExtra(EXTRA_TRACK_IDS);
         deleteThread = new Thread(() -> {
             ContentProviderUtils contentProviderUtils = new ContentProviderUtils(TrackDeleteActivity.this);
 
             PowerManager.WakeLock wakeLock = SystemUtils.acquireWakeLock(TrackDeleteActivity.this, null);
 
-            for (long id : trackIds) {
+            for (Track.Id id : trackIds) {
                 if (Thread.interrupted()) {
                     break;
                 }

src/main/java/de/dennisguse/opentracks/TrackEditActivity.java

@@ -64,9 +64,9 @@ public class TrackEditActivity extends AbstractActivity implements ChooseActivit
     protected void onCreate(Bundle bundle) {
         super.onCreate(bundle);
 
-        trackRecordingServiceConnection = new TrackRecordingServiceConnection(null);
+        trackRecordingServiceConnection = new TrackRecordingServiceConnection();
-        long trackId = getIntent().getLongExtra(EXTRA_TRACK_ID, -1L);
+        Track.Id trackId = getIntent().getParcelableExtra(EXTRA_TRACK_ID);
-        if (trackId == -1L) {
+        if (!trackId.isValid()) {
             Log.e(TAG, "invalid trackId");
             finish();
             return;

src/main/java/de/dennisguse/opentracks/TrackListActivity.java

@@ -24,6 +24,7 @@ import android.content.SharedPreferences;
 import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.content.pm.PackageManager;
 import android.database.Cursor;
+import android.graphics.drawable.AnimatedVectorDrawable;
 import android.location.LocationManager;
 import android.os.Bundle;
 import android.provider.Settings;
@@ -42,24 +43,23 @@ import androidx.core.app.ActivityCompat;
 import androidx.cursoradapter.widget.ResourceCursorAdapter;
 import androidx.loader.app.LoaderManager;
 import androidx.loader.app.LoaderManager.LoaderCallbacks;
-import androidx.loader.content.CursorLoader;
 import androidx.loader.content.Loader;
 
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TracksColumns;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.fragments.ConfirmDeleteDialogFragment;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
 import de.dennisguse.opentracks.services.TrackRecordingServiceInterface;
+import de.dennisguse.opentracks.services.handlers.GpsStatusValue;
 import de.dennisguse.opentracks.settings.SettingsActivity;
 import de.dennisguse.opentracks.util.ActivityUtils;
 import de.dennisguse.opentracks.util.IntentDashboardUtils;
 import de.dennisguse.opentracks.util.IntentUtils;
 import de.dennisguse.opentracks.util.ListItemUtils;
 import de.dennisguse.opentracks.util.PreferencesUtils;
-import de.dennisguse.opentracks.util.ServiceUtils;
 import de.dennisguse.opentracks.util.StringUtils;
 import de.dennisguse.opentracks.util.TrackIconUtils;
-import de.dennisguse.opentracks.util.TrackUtils;
 
 /**
  * An activity displaying a list of tracks.
@@ -70,10 +70,6 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
 
     private static final String TAG = TrackListActivity.class.getSimpleName();
 
-    private static final String[] PROJECTION = new String[]{TracksColumns._ID, TracksColumns.NAME,
-            TracksColumns.DESCRIPTION, TracksColumns.CATEGORY, TracksColumns.STARTTIME,
-            TracksColumns.TOTALDISTANCE, TracksColumns.TOTALTIME, TracksColumns.ICON};
-
     // The following are set in onCreate
     private ContentProviderUtils contentProviderUtils;
     private SharedPreferences sharedPreferences;
@@ -81,12 +77,12 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
     private TrackController trackController;
     private ListView listView;
     private ResourceCursorAdapter resourceCursorAdapter;
+    private GpsStatusValue gpsStatusValue;
 
     private final LoaderCallbacks<Cursor> loaderCallbacks = new LoaderCallbacks<Cursor>() {
         @Override
         public Loader<Cursor> onCreateLoader(int arg0, Bundle arg1) {
-            return new CursorLoader(TrackListActivity.this, TracksColumns.CONTENT_URI, PROJECTION, null,
+            return ContentProviderUtils.getTracksCursorLoader(TrackListActivity.this);
-                    null, TrackUtils.TRACK_SORT_ORDER);
         }
 
         @Override
@@ -102,7 +98,7 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
 
     // Preferences
     private boolean metricUnits = true;
-    private long recordingTrackId = PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+    private Track.Id recordingTrackId = null;
 
     // Callback when an item is selected in the contextual action mode
     private final ContextualActionModeCallback contextualActionModeCallback = new ContextualActionModeCallback() {
@@ -123,8 +119,7 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
 
     private boolean recordingTrackPaused;
 
-    private final OnSharedPreferenceChangeListener
+    private final OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
-            sharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
         @Override
         public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
             if (PreferencesUtils.isKey(TrackListActivity.this, R.string.stats_units_key, key)) {
@@ -162,28 +157,37 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
         }
     };
 
-    private boolean startGps = false; // true to start gps
-
     // Callback when the trackRecordingServiceConnection binding changes.
     private final Runnable bindChangedCallback = new Runnable() {
         @Override
         public void run() {
-            // After binding changes (e.g., becomes available), update the total time in trackController.
+            boolean isRecording = PreferencesUtils.isRecording(recordingTrackId);
-            runOnUiThread(() -> trackController.update(PreferencesUtils.isRecording(recordingTrackId), recordingTrackPaused));
 
-            if (!startGps) {
+            // After binding changes (e.g., becomes available), update the total time in trackController.
-                return;
+            runOnUiThread(() -> trackController.update(isRecording, recordingTrackPaused));
-            }
 
             TrackRecordingServiceInterface service = trackRecordingServiceConnection.getServiceIfBound();
             if (service == null) {
                 Log.d(TAG, "service not available to start gps or a new recording");
+                gpsStatusValue = GpsStatusValue.GPS_NONE;
                 return;
             }
-            if (startGps) {
+
-                service.startGps();
+            // Get GPS status and listen GPS status changes.
-                startGps = false;
+            gpsStatusValue = service.getGpsStatus();
+            updateGpsMenuItem(true, isRecording);
+            service.addListener(newStatus -> {
+                gpsStatusValue = newStatus;
+                updateGpsMenuItem(true, isRecording);
+            });
+
+            if (isGpsStarted()) {
+                return;
             }
+
+            service.startGps();
+            gpsStatusValue = GpsStatusValue.GPS_ENABLED;
+            updateGpsMenuItem(true, isRecording);
         }
     };
 
@@ -212,6 +216,8 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        gpsStatusValue = GpsStatusValue.GPS_NONE;
+
         recordingTrackPaused = PreferencesUtils.isRecordingTrackPausedDefault(this);
 
         contentProviderUtils = new ContentProviderUtils(this);
@@ -232,14 +238,14 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
         listView.setEmptyView(findViewById(R.id.track_list_empty_view));
         listView.setOnItemClickListener((parent, view, position, trackId) -> {
             Intent newIntent;
-            if (trackId == recordingTrackId) {
+            if (trackId == recordingTrackId.getId()) {
                 // Is recording -> open record activity.
                 newIntent = IntentUtils.newIntent(TrackListActivity.this, TrackRecordingActivity.class)
-                        .putExtra(TrackRecordedActivity.EXTRA_TRACK_ID, trackId);
+                        .putExtra(TrackRecordedActivity.EXTRA_TRACK_ID, new Track.Id(trackId));
             } else {
                 // Not recording -> open detail activity.
                 newIntent = IntentUtils.newIntent(TrackListActivity.this, TrackRecordedActivity.class)
-                        .putExtra(TrackRecordedActivity.EXTRA_TRACK_ID, trackId);
+                        .putExtra(TrackRecordedActivity.EXTRA_TRACK_ID, new Track.Id(trackId));
             }
             startActivity(newIntent);
         });
@@ -256,7 +262,7 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
                 int categoryIndex = cursor.getColumnIndex(TracksColumns.CATEGORY);
                 int descriptionIndex = cursor.getColumnIndex(TracksColumns.DESCRIPTION);
 
-                long trackId = cursor.getLong(idIndex);
+                Track.Id trackId = new Track.Id(cursor.getLong(idIndex));
                 boolean isRecording = trackId == recordingTrackId;
                 String icon = cursor.getString(iconIndex);
                 int iconId = TrackIconUtils.getIconDrawable(icon);
@@ -346,7 +352,7 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
 
     @Override
     public boolean onPrepareOptionsMenu(Menu menu) {
-        boolean isGpsStarted = ServiceUtils.isTrackRecordingServiceRunning(this);
+        boolean isGpsStarted = isGpsStarted();
         boolean isRecording = PreferencesUtils.isRecording(recordingTrackId);
         updateMenuItems(isGpsStarted, isRecording);
 
@@ -366,10 +372,8 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
                     intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                     startActivity(intent);
                 } else {
-                    startGps = !ServiceUtils.isTrackRecordingServiceRunning(this);
-
                     // Invoke trackRecordingService
-                    if (startGps) {
+                    if (!isGpsStarted()) {
                         trackRecordingServiceConnection.startAndBind(this);
                         bindChangedCallback.run();
                     } else {
@@ -425,6 +429,10 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
         // Do nothing
     }
 
+    private boolean isGpsStarted() {
+        return gpsStatusValue != GpsStatusValue.GPS_NONE && gpsStatusValue != GpsStatusValue.GPS_DISABLED;
+    }
+
     private void requestGPSPermissions() {
         if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
             ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, GPS_REQUEST_CODE);
@@ -432,17 +440,30 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
     }
 
     /**
-     * Updates the menu items.
+     * Updates the menu items with not fixed icon for gps option.
      *
      * @param isGpsStarted true if gps is started
      * @param isRecording  true if recording
      */
     private void updateMenuItems(boolean isGpsStarted, boolean isRecording) {
+        updateGpsMenuItem(isGpsStarted, isRecording);
+    }
+
+    /**
+     * Updates the menu items with the icon specified.
+     *
+     * @param isGpsStarted true if gps is started
+     * @param isRecording  true if recording
+     */
+    private void updateGpsMenuItem(boolean isGpsStarted, boolean isRecording) {
         if (startGpsMenuItem != null) {
             startGpsMenuItem.setVisible(!isRecording);
             if (!isRecording) {
                 startGpsMenuItem.setTitle(isGpsStarted ? R.string.menu_stop_gps : R.string.menu_start_gps);
-                startGpsMenuItem.setIcon(isGpsStarted ? R.drawable.ic_gps_fixed_24dp : R.drawable.ic_gps_off_24dp);
+                startGpsMenuItem.setIcon(isGpsStarted ? gpsStatusValue.icon : R.drawable.ic_gps_off_24dp);
+                if (startGpsMenuItem.getIcon() instanceof AnimatedVectorDrawable) {
+                    ((AnimatedVectorDrawable) startGpsMenuItem.getIcon()).start();
+                }
             }
         }
     }
@@ -451,14 +472,19 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
      * Handles a context item selection.
      *
      * @param itemId       the menu item id
-     * @param trackIds the track ids
+     * @param longTrackIds the track ids
      * @return true if handled.
      */
-    private boolean handleContextItem(int itemId, long[] trackIds) {
+    private boolean handleContextItem(int itemId, long... longTrackIds) {
+        Track.Id[] trackIds = new Track.Id[longTrackIds.length];
+        for (int i = 0; i < longTrackIds.length; i++) {
+            trackIds[i] = new Track.Id(longTrackIds[i]);
+        }
+
         Intent intent;
         switch (itemId) {
             case R.id.list_context_menu_show_on_map:
-                IntentDashboardUtils.startDashboard(this, trackIds);
+                IntentDashboardUtils.startDashboard(this, false, trackIds);
                 return true;
             case R.id.list_context_menu_share:
                 intent = IntentUtils.newShareFileIntent(this, trackIds);

src/main/java/de/dennisguse/opentracks/TrackRecordedActivity.java

@@ -66,7 +66,7 @@ public class TrackRecordedActivity extends AbstractListActivity implements Choos
     private ViewPager pager;
 
     // From intent.
-    private long trackId;
+    private Track.Id trackId;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -133,7 +133,7 @@ public class TrackRecordedActivity extends AbstractListActivity implements Choos
         // Update UI
         this.invalidateOptionsMenu();
 
-        if (trackId != -1L) {
+        if (trackId.isValid()) {
             trackDataHub.loadTrack(trackId);
         }
     }
@@ -182,12 +182,12 @@ public class TrackRecordedActivity extends AbstractListActivity implements Choos
         Intent intent;
         switch (item.getItemId()) {
             case R.id.track_detail_share:
-                intent = IntentUtils.newShareFileIntent(this, new long[]{trackId});
+                intent = IntentUtils.newShareFileIntent(this, trackId);
                 intent = Intent.createChooser(intent, null);
                 startActivity(intent);
                 return true;
             case R.id.track_detail_menu_show_on_map:
-                IntentDashboardUtils.startDashboard(this, trackId);
+                IntentDashboardUtils.startDashboard(this, false, trackId);
                 return true;
             case R.id.track_detail_markers:
                 intent = IntentUtils.newIntent(this, MarkerListActivity.class)
@@ -200,7 +200,7 @@ public class TrackRecordedActivity extends AbstractListActivity implements Choos
                 startActivity(intent);
                 return true;
             case R.id.track_detail_delete:
-                deleteTracks(new long[]{trackId});
+                deleteTracks(trackId);
                 return true;
             case R.id.track_detail_resume_track:
                 Intent newIntent = IntentUtils.newIntent(TrackRecordedActivity.this, TrackRecordingActivity.class)
@@ -238,12 +238,12 @@ public class TrackRecordedActivity extends AbstractListActivity implements Choos
     }
 
     private void handleIntent(Intent intent) {
-        trackId = intent.getLongExtra(EXTRA_TRACK_ID, -1L);
+        trackId = intent.getParcelableExtra(EXTRA_TRACK_ID);
 
-        long markerId = intent.getLongExtra(EXTRA_MARKER_ID, -1L);
+        Waypoint.Id waypointId = intent.getParcelableExtra(EXTRA_MARKER_ID);
-        if (markerId != -1L) {
+        if (waypointId != null) {
             // Use the trackId from the marker
-            Waypoint waypoint = contentProviderUtils.getWaypoint(markerId);
+            Waypoint waypoint = contentProviderUtils.getWaypoint(waypointId);
             if (waypoint == null) {
                 finish();
                 return;
@@ -251,7 +251,7 @@ public class TrackRecordedActivity extends AbstractListActivity implements Choos
             trackId = waypoint.getTrackId();
         }
 
-        if (trackId == -1L) {
+        if (trackId == null) {
             Log.e(TAG, "TrackDetailActivity needs EXTRA_TRACK_ID.");
             finish();
         }

src/main/java/de/dennisguse/opentracks/TrackRecordingActivity.java

@@ -60,7 +60,7 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
     private TrackController trackController;
 
     // Initialized from Intent; if a new track recording is started, a new TrackId will be provided by TrackRecordingService
-    private long trackId;
+    private Track.Id trackId;
 
     // Preferences
     private boolean recordingTrackPaused;
@@ -78,7 +78,7 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
             }
             if (!service.isRecording()) {
                 // Starts or resumes a track.
-                if (trackId == -1L) {
+                if (trackId == null) {
                     // trackId isn't initialized -> leads a new recording.
                     trackId = service.startNewTrack();
                 } else {
@@ -110,6 +110,9 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
             if (PreferencesUtils.isKey(TrackRecordingActivity.this, R.string.stats_keep_screen_on_while_recording_key, key)) {
                 setScreenOnPolicy();
             }
+            if (PreferencesUtils.isKey(TrackRecordingActivity.this, R.string.stats_fullscreen_while_recording_key, key)) {
+                setFullscreenPolicy();
+            }
 
             if (key == null) return;
 
@@ -158,13 +161,14 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
         super.onCreate(savedInstanceState);
         contentProviderUtils = new ContentProviderUtils(this);
 
-        trackId = PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+        trackId = null;
         if (savedInstanceState != null) {
             //Activity was recreated.
-            trackId = savedInstanceState.getLong(EXTRA_TRACK_ID, PreferencesUtils.RECORDING_TRACK_ID_DEFAULT);
+            trackId = savedInstanceState.getParcelable(EXTRA_TRACK_ID);
         } else {
-            trackId = getIntent().getLongExtra(EXTRA_TRACK_ID, PreferencesUtils.RECORDING_TRACK_ID_DEFAULT);
+            trackId = getIntent().getParcelableExtra(EXTRA_TRACK_ID);
-            if (trackId != PreferencesUtils.RECORDING_TRACK_ID_DEFAULT && contentProviderUtils.getTrack(trackId) == null) {
+            if (trackId != null && contentProviderUtils.getTrack(trackId) == null) {
+                Log.w(TAG, "TrackId does not exists; cannot continue the recording.");
                 finish();
             }
         }
@@ -190,12 +194,12 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
     public void onAttachedToWindow() {
         setLockscreenPolicy();
         setScreenOnPolicy();
+        setFullscreenPolicy();
         super.onAttachedToWindow();
     }
 
     private void setLockscreenPolicy() {
-        boolean showOnLockScreen = PreferencesUtils.shouldShowStatsOnLockscreen(TrackRecordingActivity.this)
+        boolean showOnLockScreen = PreferencesUtils.shouldShowStatsOnLockscreen(TrackRecordingActivity.this);
-                && PreferencesUtils.isRecording(this);
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
             setShowWhenLocked(showOnLockScreen);
@@ -207,8 +211,7 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
     }
 
     private void setScreenOnPolicy() {
-        boolean keepScreenOn = PreferencesUtils.shouldKeepScreenOn(TrackRecordingActivity.this)
+        boolean keepScreenOn = PreferencesUtils.shouldKeepScreenOn(TrackRecordingActivity.this);
-                && PreferencesUtils.isRecording(this);
 
         if (keepScreenOn) {
             getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
@@ -217,6 +220,16 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
         }
     }
 
+    private void setFullscreenPolicy() {
+        boolean keepScreenOn = PreferencesUtils.shouldUseFullscreen(TrackRecordingActivity.this);
+
+        if (keepScreenOn) {
+            getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
+        } else {
+            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
+        }
+    }
+
     @Override
     protected void onStart() {
         super.onStart();
@@ -235,7 +248,7 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
         // Update UI
         this.invalidateOptionsMenu();
 
-        if (trackId != -1L) {
+        if (trackId != null) {
             trackDataHub.loadTrack(trackId);
             trackController.onResume(true, recordingTrackPaused);
         }
@@ -253,7 +266,7 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
     protected void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putInt(CURRENT_TAB_TAG_KEY, pager.getCurrentItem());
-        outState.putLong(EXTRA_TRACK_ID, trackId);
+        outState.putParcelable(EXTRA_TRACK_ID, trackId);
     }
 
     @Override
@@ -302,7 +315,7 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
                 startActivity(intent);
                 return true;
             case R.id.track_detail_menu_show_on_map:
-                IntentDashboardUtils.startDashboard(this, trackId);
+                IntentDashboardUtils.startDashboard(this, true, trackId);
                 return true;
             case R.id.track_detail_markers:
                 intent = IntentUtils.newIntent(this, MarkerListActivity.class)

src/main/java/de/dennisguse/opentracks/chart/ChartPoint.java

@@ -43,7 +43,7 @@ public class ChartPoint {
             elevation *= UnitConversions.M_TO_FT;
         }
 
-        speed = trackStatisticsUpdater.getSmoothedSpeed() * UnitConversions.MS_TO_KMH;
+        speed = trackStatisticsUpdater.getSmoothedSpeed() * UnitConversions.MPS_TO_KMH;
         if (!metricUnits) {
             speed *= UnitConversions.KM_TO_MI;
         }

src/main/java/de/dennisguse/opentracks/content/DescriptionGenerator.java

@@ -185,7 +185,7 @@ public class DescriptionGenerator {
      */
     @VisibleForTesting
     void writeSpeed(double speed, StringBuilder builder, int resId, String lineBreak) {
-        double speedInKmHr = speed * UnitConversions.MS_TO_KMH;
+        double speedInKmHr = speed * UnitConversions.MPS_TO_KMH;
         double speedInMiHr = speedInKmHr * UnitConversions.KM_TO_MI;
         builder.append(context.getString(resId, speedInKmHr, speedInMiHr));
         builder.append(lineBreak);

src/main/java/de/dennisguse/opentracks/content/SearchEngine.java

@@ -123,8 +123,8 @@ public class SearchEngine {
         }
 
         // Finally, use arbitrary ordering, by ID.
-        long id1 = r1.track != null ? r1.track.getId() : r1.waypoint.getId();
+        long id1 = r1.track != null ? r1.track.getId().getId() : r1.waypoint.getId().getId();
-        long id2 = r2.track != null ? r2.track.getId() : r2.waypoint.getId();
+        long id2 = r2.track != null ? r2.track.getId().getId() : r2.waypoint.getId().getId();
         long idDiff = id2 - id1;
         return Long.signum(idDiff);
     };
@@ -290,7 +290,7 @@ public class SearchEngine {
         score *= getTimeBoost(query, location.getTime());
 
         // Score waypoints in the currently-selected track higher (searching inside the current track).
-        if (query.currentTrackId != -1 && waypoint.getTrackId() == query.currentTrackId) {
+        if (waypoint.getTrackId() != null && waypoint.getTrackId().equals(query.currentTrackId)) {
             score *= CURRENT_TRACK_WAYPOINT_PROMOTION;
         }
 
@@ -382,10 +382,10 @@ public class SearchEngine {
     public static class SearchQuery {
         final String textQuery;
         final Location currentLocation;
-        final long currentTrackId;
+        final Track.Id currentTrackId;
         final long currentTimestamp;
 
-        public SearchQuery(String textQuery, Location currentLocation, long currentTrackId, long currentTimestamp) {
+        public SearchQuery(String textQuery, Location currentLocation, Track.Id currentTrackId, long currentTimestamp) {
             this.textQuery = textQuery.toLowerCase(Locale.getDefault());
             this.currentLocation = currentLocation;
             this.currentTrackId = currentTrackId;
@@ -417,8 +417,8 @@ public class SearchEngine {
         @Override
         public String toString() {
             return "ScoredResult ["
-                    + (track != null ? ("trackId=" + track.getId() + ", ") : "")
+                    + (track != null ? ("trackId=" + track.getId().getId() + ", ") : "")
-                    + (waypoint != null ? ("wptId=" + waypoint.getId() + ", ") : "")
+                    + (waypoint != null ? ("wptId=" + waypoint.getId().getId() + ", ") : "")
                     + "score=" + score + "]";
         }
     }

src/main/java/de/dennisguse/opentracks/content/TrackDataHub.java

@@ -25,6 +25,7 @@ import android.os.Handler;
 import android.os.HandlerThread;
 import android.util.Log;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 
 import java.util.Collections;
@@ -78,8 +79,8 @@ public class TrackDataHub implements SharedPreferences.OnSharedPreferenceChangeL
     private Handler handler;
 
     // Preference values
-    private long selectedTrackId;
+    private Track.Id selectedTrackId;
-    private long recordingTrackId;
+    private Track.Id recordingTrackId;
     private boolean recordingTrackPaused;
 
     // Track points sampling state
@@ -174,10 +175,10 @@ public class TrackDataHub implements SharedPreferences.OnSharedPreferenceChangeL
         handler = null;
     }
 
-    public void loadTrack(final long trackId) {
+    public void loadTrack(final @NonNull Track.Id trackId) {
         runInHandlerThread(() -> {
-            if (trackId == selectedTrackId) {
+            if (trackId.equals(selectedTrackId)) {
-                Log.i(TAG, "Not reloading track " + trackId);
+                Log.i(TAG, "Not reloading track " + trackId.getId());
                 return;
             }
             selectedTrackId = trackId;
@@ -212,14 +213,14 @@ public class TrackDataHub implements SharedPreferences.OnSharedPreferenceChangeL
      * Returns true if the selected track is recording.
      */
     public boolean isSelectedTrackRecording() {
-        return selectedTrackId == recordingTrackId && PreferencesUtils.isRecording(recordingTrackId);
+        return selectedTrackId != null && selectedTrackId.equals(recordingTrackId) && PreferencesUtils.isRecording(recordingTrackId);
     }
 
     /**
      * Returns true if the selected track is paused.
      */
     public boolean isSelectedTrackPaused() {
-        return selectedTrackId == recordingTrackId && recordingTrackPaused;
+        return selectedTrackId != null && selectedTrackId.equals(recordingTrackId) && recordingTrackPaused;
     }
 
     @Override
@@ -311,7 +312,7 @@ public class TrackDataHub implements SharedPreferences.OnSharedPreferenceChangeL
             trackDataListener.clearWaypoints();
         }
 
-        try (Cursor cursor = contentProviderUtils.getWaypointCursor(selectedTrackId, -1L, MAX_DISPLAYED_WAYPOINTS)) {
+        try (Cursor cursor = contentProviderUtils.getWaypointCursor(selectedTrackId, null, MAX_DISPLAYED_WAYPOINTS)) {
             if (cursor != null && cursor.moveToFirst()) {
                 do {
                     Waypoint waypoint = contentProviderUtils.createWaypoint(cursor);
@@ -356,6 +357,11 @@ public class TrackDataHub implements SharedPreferences.OnSharedPreferenceChangeL
         long localLastSeenTrackPointIdId = updateSamplingState ? lastSeenTrackPointId : -1L;
         long maxPointId = updateSamplingState ? -1L : lastSeenTrackPointId;
 
+        if (selectedTrackId == null) {
+            Log.w(TAG, "This should not happen, but it does"); //TODO
+            return;
+        }
+
         long lastTrackPointId = contentProviderUtils.getLastTrackPointId(selectedTrackId);
         int samplingFrequency = -1;
         boolean includeNextPoint = false;

src/main/java/de/dennisguse/opentracks/content/data/Track.java

@@ -16,9 +16,17 @@
 
 package de.dennisguse.opentracks.content.data;
 
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.util.Objects;
 import java.util.UUID;
 
 import de.dennisguse.opentracks.stats.TrackStatistics;
+import de.dennisguse.opentracks.util.PreferencesUtils;
 
 /**
  * A track.
@@ -28,7 +36,7 @@ import de.dennisguse.opentracks.stats.TrackStatistics;
  */
 public class Track {
 
-    private long id = -1L;
+    private Track.Id id;
     private UUID uuid = UUID.randomUUID();
 
     private String name = "";
@@ -42,11 +50,15 @@ public class Track {
     public Track() {
     }
 
-    public long getId() {
+    /**
+     * May be null if the track was not loaded from the database.
+     */
+    public @Nullable
+    Id getId() {
         return id;
     }
 
-    public void setId(long id) {
+    public void setId(Id id) {
         this.id = id;
     }
 
@@ -97,4 +109,66 @@ public class Track {
     public void setTrackStatistics(TrackStatistics trackStatistics) {
         this.trackStatistics = trackStatistics;
     }
+
+    public static class Id implements Parcelable {
+
+        private final long id;
+
+        public Id(long id) {
+            this.id = id;
+        }
+
+        public Id(@NonNull String id) {
+            this(Long.parseLong(id));
+        }
+
+        //TOOD Limit visibility to TrackRecordingService / ContentProvider
+        public long getId() {
+            return id;
+        }
+
+        @Deprecated //TODO Use a Track.Id of null instead
+        public boolean isValid() {
+            return id != PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            Id id1 = (Id) o;
+            return id == id1.id;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(id);
+        }
+
+        @Override
+        public int describeContents() {
+            return 0;
+        }
+
+        @NonNull
+        @Override
+        public String toString() {
+            throw new RuntimeException("Not supported");
+        }
+
+        @Override
+        public void writeToParcel(Parcel parcel, int i) {
+            parcel.writeLong(id);
+        }
+
+        public static final Parcelable.Creator<Track.Id> CREATOR = new Parcelable.Creator<Track.Id>() {
+            public Track.Id createFromParcel(Parcel in) {
+                return new Track.Id(in.readLong());
+            }
+
+            public Track.Id[] newArray(int size) {
+                return new Track.Id[size];
+            }
+        };
+    }
 }

src/main/java/de/dennisguse/opentracks/content/data/TrackPointsColumns.java

@@ -33,7 +33,7 @@ public interface TrackPointsColumns extends BaseColumns {
     Uri CONTENT_URI_BY_TRACKID = Uri.parse(ContentProviderUtils.CONTENT_BASE_URI + "/" + TABLE_NAME + "/trackid");
     String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.de.dennisguse.trackpoint";
     String CONTENT_ITEMTYPE = "vnd.android.cursor.item/vnd.de.dennisguse.trackpoint";
-    String DEFAULT_SORT_ORDER = "_id";
+    String DEFAULT_SORT_ORDER = _ID;
 
     // Columns
     String TRACKID = "trackid";

src/main/java/de/dennisguse/opentracks/content/data/TracksColumns.java

@@ -32,7 +32,7 @@ public interface TracksColumns extends BaseColumns {
     Uri CONTENT_URI = Uri.parse(ContentProviderUtils.CONTENT_BASE_URI + "/" + TABLE_NAME);
     String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.de.dennisguse.track";
     String CONTENT_ITEMTYPE = "vnd.android.cursor.item/vnd.de.dennisguse.track";
-    String DEFAULT_SORT_ORDER = "_id";
+    String DEFAULT_SORT_ORDER = _ID;
 
     // Columns
     String UUID = "uuid";

src/main/java/de/dennisguse/opentracks/content/data/Waypoint.java

@@ -18,10 +18,17 @@ package de.dennisguse.opentracks.content.data;
 
 import android.location.Location;
 import android.net.Uri;
+import android.os.Parcel;
+import android.os.Parcelable;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 
+import java.util.Objects;
+
+import de.dennisguse.opentracks.util.PreferencesUtils;
+
 /**
  * A waypoint.
  *
@@ -30,12 +37,12 @@ import androidx.annotation.VisibleForTesting;
  */
 public final class Waypoint {
 
-    private long id = -1L;
+    private Id id;
     private String name = "";
     private String description = "";
     private String category = "";
     private String icon = "";
-    private long trackId = -1L;
+    private Track.Id trackId;
     private double length = 0.0;
     private long duration = 0;
     private Location location;
@@ -51,7 +58,7 @@ public final class Waypoint {
         this.location = location;
     }
 
-    public Waypoint(String name, String description, String category, String icon, long trackId, double length, long duration, @NonNull Location location, String photoUrl) {
+    public Waypoint(String name, String description, String category, String icon, @NonNull Track.Id trackId, double length, long duration, @NonNull Location location, String photoUrl) {
         this.name = name;
         this.description = description;
         this.category = category;
@@ -63,11 +70,15 @@ public final class Waypoint {
         this.photoUrl = photoUrl;
     }
 
-    public long getId() {
+    /**
+     * May be null if the waypoint was not loaded from the database.
+     */
+    public @Nullable
+    Id getId() {
         return id;
     }
 
-    public void setId(long id) {
+    public void setId(Id id) {
         this.id = id;
     }
 
@@ -103,11 +114,11 @@ public final class Waypoint {
         this.icon = icon;
     }
 
-    public long getTrackId() {
+    public Track.Id getTrackId() {
         return trackId;
     }
 
-    public void setTrackId(long trackId) {
+    public void setTrackId(Track.Id trackId) {
         this.trackId = trackId;
     }
 
@@ -147,4 +158,66 @@ public final class Waypoint {
     public boolean hasPhoto() {
         return photoUrl != null && !"".equals(photoUrl);
     }
+
+    public static class Id implements Parcelable {
+
+        private final long id;
+
+        public Id(long id) {
+            this.id = id;
+        }
+
+        public Id(@NonNull String id) {
+            this(Long.parseLong(id));
+        }
+
+        //TOOD Limit visibility to TrackRecordingService / ContentProvider
+        public long getId() {
+            return id;
+        }
+
+        @Deprecated //TODO Use a Waypoint.Id of null instead
+        public boolean isValid() {
+            return id != PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            Id id1 = (Id) o;
+            return id == id1.id;
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(id);
+        }
+
+        @NonNull
+        @Override
+        public String toString() {
+            throw new RuntimeException("Not supported");
+        }
+
+        @Override
+        public int describeContents() {
+            return 0;
+        }
+
+        @Override
+        public void writeToParcel(Parcel parcel, int i) {
+            parcel.writeLong(id);
+        }
+
+        public static final Parcelable.Creator<Id> CREATOR = new Parcelable.Creator<Id>() {
+            public Id createFromParcel(Parcel in) {
+                return new Id(in.readLong());
+            }
+
+            public Id[] newArray(int size) {
+                return new Id[size];
+            }
+        };
+    }
 }

src/main/java/de/dennisguse/opentracks/content/data/WaypointsColumns.java

@@ -33,7 +33,7 @@ public interface WaypointsColumns extends BaseColumns {
     Uri CONTENT_URI_BY_TRACKID = Uri.parse(ContentProviderUtils.CONTENT_BASE_URI + "/" + TABLE_NAME + "/trackid");
     String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.de.dennisguse.waypoint";
     String CONTENT_ITEMTYPE = "vnd.android.cursor.item/vnd.de.dennisguse.waypoint";
-    String DEFAULT_SORT_ORDER = "_id";
+    String DEFAULT_SORT_ORDER = _ID;
 
     // Columns
     String NAME = "name"; // waypoint name

src/main/java/de/dennisguse/opentracks/content/provider/ContentProviderUtils.java

@@ -23,13 +23,19 @@ import android.database.Cursor;
 import android.location.Location;
 import android.net.Uri;
 import android.text.TextUtils;
+import android.util.Log;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
+import androidx.loader.content.CursorLoader;
+import androidx.loader.content.Loader;
 
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
+import java.util.UUID;
 
 import de.dennisguse.opentracks.BuildConfig;
 import de.dennisguse.opentracks.android.ContentResolverWrapper;
@@ -42,6 +48,7 @@ import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.data.WaypointsColumns;
 import de.dennisguse.opentracks.stats.TrackStatistics;
 import de.dennisguse.opentracks.util.FileUtils;
+import de.dennisguse.opentracks.util.TrackUtils;
 import de.dennisguse.opentracks.util.UUIDUtils;
 
 /**
@@ -56,7 +63,8 @@ public class ContentProviderUtils {
     private static final int MAX_LATITUDE = 90000000;
 
     // The authority (the first part of the URI) for the app's content provider.
-    static final String AUTHORITY_PACKAGE = BuildConfig.APPLICATION_ID + ".content";
+    @VisibleForTesting
+    public static final String AUTHORITY_PACKAGE = BuildConfig.APPLICATION_ID + ".content";
 
     // The base URI for the app's content provider.
     public static final String CONTENT_BASE_URI = "content://" + AUTHORITY_PACKAGE;
@@ -86,8 +94,8 @@ public class ContentProviderUtils {
      *
      * @param trackId the track id
      */
-    public void clearTrack(Context context, long trackId) {
+    public void clearTrack(Track.Id trackId) {
-        deleteTrackPointsAndWaypoints(context, trackId);
+        deleteTrackPointsAndWaypoints(trackId);
         Track track = new Track();
         track.setId(trackId);
         updateTrack(track);
@@ -118,7 +126,7 @@ public class ContentProviderUtils {
         Track track = new Track();
         TrackStatistics trackStatistics = track.getTrackStatistics();
         if (!cursor.isNull(idIndex)) {
-            track.setId(cursor.getLong(idIndex));
+            track.setId(new Track.Id(cursor.getLong(idIndex)));
         }
         if (!cursor.isNull(uuidIndex)) {
             track.setUuid(UUIDUtils.fromBytes(cursor.getBlob(uuidIndex)));
@@ -181,14 +189,17 @@ public class ContentProviderUtils {
      *
      * @param trackId the track id
      */
-    public void deleteTrack(Context context, long trackId) {
+    public void deleteTrack(Context context, Track.Id trackId) {
-        deleteTrackPointsAndWaypoints(context, trackId);
+        if (trackId == null) {
+            return;
+        }
+        deleteTrackPointsAndWaypoints(trackId);
 
         // Delete track folder resources.
         FileUtils.deleteDirectoryRecurse(FileUtils.getPhotoDir(context, trackId));
 
         // Delete track last since it triggers a database vacuum call
-        contentResolver.delete(TracksColumns.CONTENT_URI, TracksColumns._ID + "=?", new String[]{Long.toString(trackId)});
+        contentResolver.delete(TracksColumns.CONTENT_URI, TracksColumns._ID + "=?", new String[]{Long.toString(trackId.getId())});
     }
 
     /**
@@ -196,21 +207,15 @@ public class ContentProviderUtils {
      *
      * @param trackId the track id
      */
-    private void deleteTrackPointsAndWaypoints(Context context, long trackId) {
+    private void deleteTrackPointsAndWaypoints(@NonNull Track.Id trackId) {
-        String where = TrackPointsColumns.TRACKID + "=?";
+        String[] selectionArgs = new String[]{Long.toString(trackId.getId())};
-        String[] selectionArgs = new String[]{Long.toString(trackId)};
-        contentResolver.delete(TrackPointsColumns.CONTENT_URI_BY_ID, where, selectionArgs);
 
-        contentResolver.delete(WaypointsColumns.CONTENT_URI, WaypointsColumns.TRACKID + "=?", new String[]{Long.toString(trackId)});
+        contentResolver.delete(TrackPointsColumns.CONTENT_URI_BY_ID, TrackPointsColumns.TRACKID + "=?", selectionArgs);
+        contentResolver.delete(WaypointsColumns.CONTENT_URI, WaypointsColumns.TRACKID + "=?", selectionArgs);
     }
 
-    /**
-     * Gets all the tracks.
-     *
-     * @return the tracks do not have any trackPoints attached.
-     */
     @VisibleForTesting
-    public List<Track> getAllTracks() {
+    public List<Track> getTracks() {
         ArrayList<Track> tracks = new ArrayList<>();
         try (Cursor cursor = getTrackCursor(null, null, TracksColumns._ID)) {
             if (cursor != null && cursor.moveToFirst()) {
@@ -223,6 +228,17 @@ public class ContentProviderUtils {
         return tracks;
     }
 
+    public static Loader<Cursor> getTracksCursorLoader(Context context) {
+        String[] PROJECTION = new String[]{TracksColumns._ID, TracksColumns.NAME,
+                TracksColumns.DESCRIPTION, TracksColumns.CATEGORY, TracksColumns.STARTTIME,
+                TracksColumns.TOTALDISTANCE, TracksColumns.TOTALTIME, TracksColumns.ICON};
+
+        return new CursorLoader(context, TracksColumns.CONTENT_URI, PROJECTION, null, null, TrackUtils.TRACK_SORT_ORDER);
+    }
+
+    @Deprecated
+    //TODO Do not use; rather get the proper TrackId (e.g., resume a track might give you some weird effects).
+    @VisibleForTesting
     public Track getLastTrack() {
         try (Cursor cursor = getTrackCursor(null, null, TracksColumns.STARTTIME + " DESC")) {
             // Using the same order as shown in the track list
@@ -235,13 +251,25 @@ public class ContentProviderUtils {
 
     /**
      * @param trackId the track id.
-     * @return the track doesn't have any trackPoints attached
      */
-    public Track getTrack(long trackId) {
+    public Track getTrack(Track.Id trackId) {
-        if (trackId < 0) {
+        if (trackId == null || !trackId.isValid()) {
             return null;
         }
-        try (Cursor cursor = getTrackCursor(TracksColumns._ID + "=?", new String[]{Long.toString(trackId)}, TracksColumns._ID)) {
+        try (Cursor cursor = getTrackCursor(TracksColumns._ID + "=?", new String[]{Long.toString(trackId.getId())}, null)) {
+            if (cursor != null && cursor.moveToNext()) {
+                return createTrack(cursor);
+            }
+        }
+        return null;
+    }
+
+    /**
+     * @param trackUUID the track uuid.
+     */
+    public Track getTrack(@NonNull UUID trackUUID) {
+        String trackUUIDsearch = UUIDUtils.toHex(trackUUID);
+        try (Cursor cursor = getTrackCursor("hex(" + TracksColumns.UUID + ")=?", new String[]{trackUUIDsearch}, null)) {
             if (cursor != null && cursor.moveToNext()) {
                 return createTrack(cursor);
             }
@@ -279,7 +307,7 @@ public class ContentProviderUtils {
      * @param track the track
      */
     public void updateTrack(Track track) {
-        contentResolver.update(TracksColumns.CONTENT_URI, createContentValues(track), TracksColumns._ID + "=?", new String[]{Long.toString(track.getId())});
+        contentResolver.update(TracksColumns.CONTENT_URI, createContentValues(track), TracksColumns._ID + "=?", new String[]{Long.toString(track.getId().getId())});
     }
 
     private ContentValues createContentValues(Track track) {
@@ -287,8 +315,8 @@ public class ContentProviderUtils {
         TrackStatistics trackStatistics = track.getTrackStatistics();
 
         // Value < 0 indicates no id is available
-        if (track.getId() >= 0) {
+        if (track.getId() != null && track.getId().isValid()) {
-            values.put(TracksColumns._ID, track.getId());
+            values.put(TracksColumns._ID, track.getId().getId());
         }
         values.put(TracksColumns.UUID, UUIDUtils.toBytes(track.getUuid()));
         values.put(TracksColumns.NAME, track.getName());
@@ -354,7 +382,7 @@ public class ContentProviderUtils {
         Waypoint waypoint = new Waypoint(location);
 
         if (!cursor.isNull(idIndex)) {
-            waypoint.setId(cursor.getLong(idIndex));
+            waypoint.setId(new Waypoint.Id(cursor.getLong(idIndex)));
         }
         if (!cursor.isNull(nameIndex)) {
             waypoint.setName(cursor.getString(nameIndex));
@@ -369,7 +397,7 @@ public class ContentProviderUtils {
             waypoint.setIcon(cursor.getString(iconIndex));
         }
         if (!cursor.isNull(trackIdIndex)) {
-            waypoint.setTrackId(cursor.getLong(trackIdIndex));
+            waypoint.setTrackId(new Track.Id(cursor.getLong(trackIdIndex)));
         }
         if (!cursor.isNull(lengthIndex)) {
             waypoint.setLength(cursor.getFloat(lengthIndex));
@@ -384,10 +412,10 @@ public class ContentProviderUtils {
         return waypoint;
     }
 
-    public void deleteWaypoint(Context context, long waypointId) {
+    public void deleteWaypoint(Context context, Waypoint.Id waypointId) {
         final Waypoint waypoint = getWaypoint(waypointId);
         deleteWaypointPhoto(context, waypoint);
-        contentResolver.delete(WaypointsColumns.CONTENT_URI, WaypointsColumns._ID + "=?", new String[]{Long.toString(waypointId)});
+        contentResolver.delete(WaypointsColumns.CONTENT_URI, WaypointsColumns._ID + "=?", new String[]{Long.toString(waypointId.getId())});
     }
 
     /**
@@ -396,13 +424,13 @@ public class ContentProviderUtils {
      * @param trackId the track id
      * @return -1 if not able to get the next waypoint number.
      */
-    public int getNextWaypointNumber(long trackId) {
+    public int getNextWaypointNumber(Track.Id trackId) {
-        if (trackId < 0) {
+        if (!trackId.isValid()) {
             return -1;
         }
         String[] projection = {WaypointsColumns._ID};
         String selection = WaypointsColumns.TRACKID + "=?";
-        String[] selectionArgs = new String[]{Long.toString(trackId)};
+        String[] selectionArgs = new String[]{Long.toString(trackId.getId())};
         try (Cursor cursor = getWaypointCursor(projection, selection, selectionArgs, WaypointsColumns._ID, -1)) {
             if (cursor != null) {
                 return cursor.getCount();
@@ -411,12 +439,12 @@ public class ContentProviderUtils {
         return -1;
     }
 
-    public Waypoint getWaypoint(long waypointId) {
+    public Waypoint getWaypoint(Waypoint.Id waypointId) {
-        if (waypointId < 0) {
+        if (!waypointId.isValid()) {
             return null;
         }
         try (Cursor cursor = getWaypointCursor(null, WaypointsColumns._ID + "=?",
-                new String[]{Long.toString(waypointId)}, WaypointsColumns._ID, 1)) {
+                new String[]{Long.toString(waypointId.getId())}, WaypointsColumns._ID, 1)) {
             if (cursor != null && cursor.moveToFirst()) {
                 return createWaypoint(cursor);
             }
@@ -442,30 +470,30 @@ public class ContentProviderUtils {
      * The caller owns the returned cursor and is responsible for closing it.
      *
      * @param trackId       the track id
-     * @param minWaypointId the minimum waypoint id. -1L to ignore
+     * @param minWaypointId the minimum waypoint id. null to ignore
      * @param maxWaypoints  the maximum number of waypoints to return. -1 for no limit
      */
-    public Cursor getWaypointCursor(long trackId, long minWaypointId, int maxWaypoints) {
+    public Cursor getWaypointCursor(Track.Id trackId, @Nullable Waypoint.Id minWaypointId, int maxWaypoints) {
-        if (trackId < 0) {
+        if (!trackId.isValid()) {
             return null;
         }
 
         String selection;
         String[] selectionArgs;
-        if (minWaypointId >= 0) {
+        if (minWaypointId != null && minWaypointId.isValid()) {
             selection = WaypointsColumns.TRACKID + "=? AND " + WaypointsColumns._ID + ">=?";
-            selectionArgs = new String[]{Long.toString(trackId), Long.toString(minWaypointId)};
+            selectionArgs = new String[]{Long.toString(trackId.getId()), Long.toString(minWaypointId.getId())};
         } else {
             selection = WaypointsColumns.TRACKID + "=?";
-            selectionArgs = new String[]{Long.toString(trackId)};
+            selectionArgs = new String[]{Long.toString(trackId.getId())};
         }
         return getWaypointCursor(null, selection, selectionArgs, WaypointsColumns._ID, maxWaypoints);
     }
 
     @VisibleForTesting
-    public List<Waypoint> getWaypoints(long trackId) {
+    public List<Waypoint> getWaypoints(Track.Id trackId) {
         ArrayList<Waypoint> waypoints = new ArrayList<>();
-        try (Cursor cursor = getWaypointCursor(trackId, -1L, -1)) {
+        try (Cursor cursor = getWaypointCursor(trackId, null, -1)) {
             if (cursor.moveToFirst()) {
                 do {
                     waypoints.add(createWaypoint(cursor));
@@ -475,19 +503,34 @@ public class ContentProviderUtils {
         return waypoints;
     }
 
+    public static Loader<Cursor> getWaypointsLoader(Context context, @Nullable Track.Id trackId) {
+        final String[] PROJECTION = new String[]{WaypointsColumns._ID,
+                WaypointsColumns.NAME, WaypointsColumns.DESCRIPTION, WaypointsColumns.CATEGORY,
+                WaypointsColumns.TIME, WaypointsColumns.PHOTOURL,
+                WaypointsColumns.LATITUDE, WaypointsColumns.LONGITUDE};
+
+        if (trackId != null) {
+            return new CursorLoader(context, WaypointsColumns.CONTENT_URI, PROJECTION,
+                    WaypointsColumns.TRACKID + "=?",
+                    new String[]{String.valueOf(trackId.getId())}, null);
+        } else {
+            return new CursorLoader(context, WaypointsColumns.CONTENT_URI, PROJECTION, null, null, null);
+        }
+    }
+
     /**
      * Gets the number of waypoints for a track.
      *
      * @param trackId the track id
      */
-    public int getWaypointCount(long trackId) {
+    public int getWaypointCount(Track.Id trackId) {
-        if (trackId < 0) {
+        if (!trackId.isValid()) {
             return 0;
         }
 
         String[] projection = new String[]{"count(*) AS count"};
         String selection = WaypointsColumns.TRACKID + "=?";
-        String[] selectionArgs = new String[]{Long.toString(trackId)};
+        String[] selectionArgs = new String[]{Long.toString(trackId.getId())};
         try (Cursor cursor = contentResolver.query(WaypointsColumns.CONTENT_URI, projection, selection, selectionArgs, WaypointsColumns._ID)) {
             if (cursor == null) {
                 return 0;
@@ -503,8 +546,8 @@ public class ContentProviderUtils {
      * @param waypoint the waypoint
      * @return the content provider URI of the inserted waypoint.
      */
-    public Uri insertWaypoint(Waypoint waypoint) {
+    public Uri insertWaypoint(@NonNull Waypoint waypoint) {
-        waypoint.setId(-1L);
+        waypoint.setId(null);
         return contentResolver.insert(WaypointsColumns.CONTENT_URI, createContentValues(waypoint));
     }
 
@@ -539,22 +582,23 @@ public class ContentProviderUtils {
         if (!updatedWaypoint.hasPhoto()) {
             deleteWaypointPhoto(context, savedWaypoint);
         }
-        int rows = contentResolver.update(WaypointsColumns.CONTENT_URI, createContentValues(updatedWaypoint), WaypointsColumns._ID + "=?", new String[]{Long.toString(updatedWaypoint.getId())});
+        int rows = contentResolver.update(WaypointsColumns.CONTENT_URI, createContentValues(updatedWaypoint), WaypointsColumns._ID + "=?", new String[]{Long.toString(updatedWaypoint.getId().getId())});
         return rows == 1;
     }
 
-    ContentValues createContentValues(Waypoint waypoint) {
+    ContentValues createContentValues(@NonNull Waypoint waypoint) {
         ContentValues values = new ContentValues();
 
-        // Value < 0 indicates no id is available
+        if (waypoint.getId() != null && waypoint.getId().isValid()) {
-        if (waypoint.getId() >= 0) {
+            values.put(WaypointsColumns._ID, waypoint.getId().getId());
-            values.put(WaypointsColumns._ID, waypoint.getId());
         }
         values.put(WaypointsColumns.NAME, waypoint.getName());
         values.put(WaypointsColumns.DESCRIPTION, waypoint.getDescription());
         values.put(WaypointsColumns.CATEGORY, waypoint.getCategory());
         values.put(WaypointsColumns.ICON, waypoint.getIcon());
-        values.put(WaypointsColumns.TRACKID, waypoint.getTrackId());
+        if (waypoint.getTrackId() != null) {
+            values.put(WaypointsColumns.TRACKID, waypoint.getTrackId().getId());
+        }
         values.put(WaypointsColumns.LENGTH, waypoint.getLength());
         values.put(WaypointsColumns.DURATION, waypoint.getDuration());
 
@@ -647,7 +691,7 @@ public class ContentProviderUtils {
      * @return the number of trackPoints inserted
      */
     //TODO Only used for testing and file import; might be better to replace it.
-    public int bulkInsertTrackPoint(TrackPoint[] trackPoints, long trackId) {
+    public int bulkInsertTrackPoint(TrackPoint[] trackPoints, Track.Id trackId) {
         ContentValues[] values = new ContentValues[trackPoints.length];
         for (int i = 0; i < values.length; i++) {
             values[i] = createContentValues(trackPoints[i], trackId);
@@ -657,23 +701,23 @@ public class ContentProviderUtils {
 
     /**
      * Gets the first location id for a track.
-     * Returns -1L if it doesn't exist.
+     * Returns null if it doesn't exist.
      *
      * @param trackId the track id
      */
     @Deprecated
-    public long getFirstTrackPointId(long trackId) {
+    public Track.Id getFirstTrackPointId(Track.Id trackId) {
-        if (trackId < 0) {
+        if (!trackId.isValid()) {
-            return -1L;
+            return null;
         }
         String selection = TrackPointsColumns._ID + "=(SELECT MIN(" + TrackPointsColumns._ID + ") FROM " + TrackPointsColumns.TABLE_NAME + " WHERE " + TrackPointsColumns.TRACKID + "=?)";
-        String[] selectionArgs = new String[]{Long.toString(trackId)};
+        String[] selectionArgs = new String[]{Long.toString(trackId.getId())};
         try (Cursor cursor = getTrackPointCursor(new String[]{TrackPointsColumns._ID}, selection, selectionArgs, TrackPointsColumns._ID)) {
             if (cursor != null && cursor.moveToFirst()) {
-                return cursor.getLong(cursor.getColumnIndexOrThrow(TrackPointsColumns._ID));
+                return new Track.Id(cursor.getLong(cursor.getColumnIndexOrThrow(TrackPointsColumns._ID)));
             }
         }
-        return -1L;
+        return null;
     }
 
     /**
@@ -683,12 +727,13 @@ public class ContentProviderUtils {
      * @param trackId the track id
      */
     @Deprecated
-    public long getLastTrackPointId(long trackId) {
+    public long getLastTrackPointId(Track.Id trackId) {
-        if (trackId < 0) {
+        if (trackId == null || !trackId.isValid()) {
+            Log.w(TAG, "Fix callers who do this.");
             return -1L;
         }
         String selection = TrackPointsColumns._ID + "=(SELECT MAX(" + TrackPointsColumns._ID + ") from " + TrackPointsColumns.TABLE_NAME + " WHERE " + TrackPointsColumns.TRACKID + "=?)";
-        String[] selectionArgs = new String[]{Long.toString(trackId)};
+        String[] selectionArgs = new String[]{Long.toString(trackId.getId())};
         try (Cursor cursor = getTrackPointCursor(new String[]{TrackPointsColumns._ID}, selection, selectionArgs, TrackPointsColumns._ID)) {
             if (cursor != null && cursor.moveToFirst()) {
                 return cursor.getLong(cursor.getColumnIndexOrThrow(TrackPointsColumns._ID));
@@ -704,12 +749,12 @@ public class ContentProviderUtils {
      * @param location the location
      * @return trackPoint id if the location is in the track. -1L otherwise.
      */
-    public long getTrackPointId(long trackId, Location location) {
+    public long getTrackPointId(Track.Id trackId, Location location) {
-        if (trackId < 0) {
+        if (!trackId.isValid()) {
             return -1L;
         }
         String selection = TrackPointsColumns._ID + "=(SELECT MAX(" + TrackPointsColumns._ID + ") FROM " + TrackPointsColumns.TABLE_NAME + " WHERE " + TrackPointsColumns.TRACKID + "=? AND " + TrackPointsColumns.TIME + "=?)";
-        String[] selectionArgs = new String[]{Long.toString(trackId), Long.toString(location.getTime())};
+        String[] selectionArgs = new String[]{Long.toString(trackId.getId()), Long.toString(location.getTime())};
         try (Cursor cursor = getTrackPointCursor(new String[]{TrackPointsColumns._ID}, selection, selectionArgs, TrackPointsColumns._ID)) {
             if (cursor != null && cursor.moveToFirst()) {
                 return cursor.getLong(cursor.getColumnIndexOrThrow(TrackPointsColumns._ID));
@@ -735,8 +780,8 @@ public class ContentProviderUtils {
      * @param maxLocations      maximum number of locations to return. -1 for no limit
      * @param descending        true to sort the result in descending order (latest location first)
      */
-    public Cursor getTrackPointCursor(long trackId, long startTrackPointId, int maxLocations, boolean descending) {
+    public Cursor getTrackPointCursor(Track.Id trackId, long startTrackPointId, int maxLocations, boolean descending) {
-        if (trackId < 0) {
+        if (!trackId.isValid()) {
             return null;
         }
 
@@ -745,10 +790,10 @@ public class ContentProviderUtils {
         if (startTrackPointId >= 0) {
             String comparison = descending ? "<=" : ">=";
             selection = TrackPointsColumns.TRACKID + "=? AND " + TrackPointsColumns._ID + comparison + "?";
-            selectionArgs = new String[]{Long.toString(trackId), Long.toString(startTrackPointId)};
+            selectionArgs = new String[]{Long.toString(trackId.getId()), Long.toString(startTrackPointId)};
         } else {
             selection = TrackPointsColumns.TRACKID + "=?";
-            selectionArgs = new String[]{Long.toString(trackId)};
+            selectionArgs = new String[]{Long.toString(trackId.getId())};
         }
 
         String sortOrder = TrackPointsColumns._ID;
@@ -768,12 +813,12 @@ public class ContentProviderUtils {
      * @param trackId the track id
      */
     @Deprecated
-    public TrackPoint getLastValidTrackPoint(long trackId) {
+    public TrackPoint getLastValidTrackPoint(Track.Id trackId) {
-        if (trackId < 0) {
+        if (!trackId.isValid()) {
             return null;
         }
         String selection = TrackPointsColumns._ID + "=(SELECT MAX(" + TrackPointsColumns._ID + ") FROM " + TrackPointsColumns.TABLE_NAME + " WHERE " + TrackPointsColumns.TRACKID + "=? AND " + TrackPointsColumns.LATITUDE + "<=" + MAX_LATITUDE + ")";
-        String[] selectionArgs = new String[]{Long.toString(trackId)};
+        String[] selectionArgs = new String[]{Long.toString(trackId.getId())};
         return findTrackPointBy(selection, selectionArgs);
     }
 
@@ -784,7 +829,7 @@ public class ContentProviderUtils {
      * @param trackId    the track id
      * @return the content provider URI of the inserted trackPoint
      */
-    public Uri insertTrackPoint(TrackPoint trackPoint, long trackId) {
+    public Uri insertTrackPoint(TrackPoint trackPoint, Track.Id trackId) {
         return contentResolver.insert(TrackPointsColumns.CONTENT_URI_BY_ID, createContentValues(trackPoint, trackId));
     }
 
@@ -794,9 +839,9 @@ public class ContentProviderUtils {
      * @param trackPoint the trackPoint
      * @param trackId    the track id
      */
-    private ContentValues createContentValues(TrackPoint trackPoint, long trackId) {
+    private ContentValues createContentValues(TrackPoint trackPoint, Track.Id trackId) {
         ContentValues values = new ContentValues();
-        values.put(TrackPointsColumns.TRACKID, trackId);
+        values.put(TrackPointsColumns.TRACKID, trackId.getId());
         values.put(TrackPointsColumns.LONGITUDE, (int) (trackPoint.getLongitude() * 1E6));
         values.put(TrackPointsColumns.LATITUDE, (int) (trackPoint.getLatitude() * 1E6));
 
@@ -837,7 +882,7 @@ public class ContentProviderUtils {
      * @param startTrackPointId the starting trackPoint id. -1L to ignore
      * @param descending        true to sort the result in descending order (latest location first)
      */
-    public TrackPointIterator getTrackPointLocationIterator(final long trackId, final long startTrackPointId, final boolean descending) {
+    public TrackPointIterator getTrackPointLocationIterator(final Track.Id trackId, final long startTrackPointId, final boolean descending) {
         return new TrackPointIterator(this, trackId, startTrackPointId, descending);
     }
 
@@ -863,7 +908,7 @@ public class ContentProviderUtils {
     }
 
     @VisibleForTesting
-    public List<TrackPoint> getTrackPoints(long trackId) {
+    public List<TrackPoint> getTrackPoints(Track.Id trackId) {
         List<TrackPoint> trackPoints = null;
 
         try (Cursor trackPointCursor = getTrackPointCursor(trackId, -1L, -1, false)) {
@@ -894,13 +939,23 @@ public class ContentProviderUtils {
         this.defaultCursorBatchSize = defaultCursorBatchSize;
     }
 
+
+    public static String formatIdListForUri(Track.Id... trackIds) {
+        long[] ids = new long[trackIds.length];
+        for (int i = 0; i < trackIds.length; i++) {
+            ids[i] = trackIds[i].getId();
+        }
+
+        return formatIdListForUri(ids);
+    }
+
     /**
      * Formats an array of IDs as comma separated string value
      *
      * @param ids array with IDs
      * @return comma separated list of ids
      */
-    public static String formatIdListForUri(long[] ids) {
+    private static String formatIdListForUri(long[] ids) {
         StringBuilder idsPathSegment = new StringBuilder();
         for (long id : ids) {
             if (idsPathSegment.length() > 0) {

src/main/java/de/dennisguse/opentracks/content/provider/CustomContentProvider.java

@@ -42,7 +42,7 @@ import de.dennisguse.opentracks.content.data.WaypointsColumns;
  *
  * @author Leif Hendrik Wilden
  */
-public abstract class CustomContentProvider extends ContentProvider {
+public class CustomContentProvider extends ContentProvider {
 
     private static final String TAG = CustomContentProvider.class.getSimpleName();
 

src/main/java/de/dennisguse/opentracks/content/provider/CustomSQLiteOpenHelper.java

@@ -11,6 +11,7 @@ import androidx.annotation.VisibleForTesting;
 
 import java.util.UUID;
 
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.data.TracksColumns;
 import de.dennisguse.opentracks.content.data.WaypointsColumns;
@@ -20,13 +21,14 @@ import de.dennisguse.opentracks.util.UUIDUtils;
  * Database helper for creating and upgrading the database.
  */
 @VisibleForTesting
-class CustomSQLiteOpenHelper extends SQLiteOpenHelper {
+public class CustomSQLiteOpenHelper extends SQLiteOpenHelper {
 
     private static final String TAG = CustomSQLiteOpenHelper.class.getSimpleName();
 
     private static final int DATABASE_VERSION = 26;
 
-    private static final String DATABASE_NAME = "database.db";
+    @VisibleForTesting
+    public static final String DATABASE_NAME = "database.db";
 
     public CustomSQLiteOpenHelper(Context context) {
         this(context, DATABASE_NAME);
@@ -161,7 +163,7 @@ class CustomSQLiteOpenHelper extends SQLiteOpenHelper {
             if (cursor.moveToFirst()) {
                 int trackIdIndex = cursor.getColumnIndexOrThrow("_id");
                 do {
-                    long trackId = cursor.getLong(trackIdIndex);
+                    Track.Id trackId = new Track.Id(cursor.getLong(trackIdIndex));
                     ContentValues cv = new ContentValues();
                     cv.put("uuid", UUIDUtils.toBytes(UUID.randomUUID()));
                     db.update("tracks", cv, "_id = ?", new String[]{String.valueOf(trackId)});

src/main/java/de/dennisguse/opentracks/content/provider/ShareContentProvider.java

@@ -17,8 +17,11 @@ import androidx.annotation.Nullable;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 
 import de.dennisguse.opentracks.android.IContentResolver;
 import de.dennisguse.opentracks.content.data.Track;
@@ -29,9 +32,9 @@ import de.dennisguse.opentracks.io.file.exporter.TrackExporter;
 /**
  * A content provider that mimics the behavior of {@link androidx.core.content.FileProvider}, which shares virtual (non-existing) KML-files.
  * The actual content of the virtual files is generated by using the functionality defined in {@link CustomContentProvider}.
- *
+ * <p>
  * Moreover, it manages access to OpenTrack's database via {@link CustomContentProvider}.
- *
+ * <p>
  * Explanation:
  * Although a request is handled by a {@link android.content.ContentProvider} (with temporarily granted permission), Android's security infrastructure prevents forwarding queries to non-exported {@link android.content.ContentProvider}.
  * Thus, if {@link ShareContentProvider} and {@link CustomContentProvider} would be two different instances, the data would not be accessible to external apps.
@@ -70,14 +73,20 @@ public class ShareContentProvider extends CustomContentProvider implements ICont
         uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TracksColumns.TABLE_NAME + "/" + TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA_AND_PICTURES.getName() + "/*/*", URI_KMZ_WITH_TRACKDETAIL_SENSORDATA_AND_PICTURES);
     }
 
-    public static Pair<Uri, String> createURI(long[] trackIds, String trackName, @NonNull TrackFileFormat trackFileFormat) {
+    public static Pair<Uri, String> createURI(Track.Id trackId, String trackName, @NonNull TrackFileFormat trackFileFormat) {
-        if (trackIds.length == 0) {
+        Set<Track.Id> trackIds = new HashSet<>(1);
+        trackIds.add(trackId);
+        return createURI(trackIds, trackName, trackFileFormat);
+    }
+
+    public static Pair<Uri, String> createURI(Set<Track.Id> trackIds, String trackName, @NonNull TrackFileFormat trackFileFormat) {
+        if (trackIds.size() == 0) {
             throw new UnsupportedOperationException();
         }
 
         StringBuilder trackIdBuilder = new StringBuilder();
-        for (long trackId : trackIds) {
+        for (Track.Id trackId : trackIds) {
-            trackIdBuilder.append(trackId).append(TRACKID_DELIMITER);
+            trackIdBuilder.append(trackId.getId()).append(TRACKID_DELIMITER);
         }
         trackIdBuilder.deleteCharAt(trackIdBuilder.lastIndexOf(TRACKID_DELIMITER));
 
@@ -89,18 +98,18 @@ public class ShareContentProvider extends CustomContentProvider implements ICont
         return new Pair<>(uri, mime);
     }
 
-    static long[] parseURI(Uri uri) {
+    static Set<Track.Id> parseURI(Uri uri) {
         List<String> uriPaths = uri.getPathSegments();
         if (uriPaths == null || uriPaths.size() < 3) {
             Log.d(TAG, "URI does not contain any trackIds.");
-            return new long[]{};
+            return new HashSet<>();
         }
 
         String[] uriTrackIds = uriPaths.get(2).split(TRACKID_DELIMITER);
 
-        long[] trackIds = new long[uriTrackIds.length];
+        Set<Track.Id> trackIds = new HashSet<>();
-        for (int i = 0; i < trackIds.length; i++) {
+        for (String uriTrackId : uriTrackIds) {
-            trackIds[i] = Long.parseLong(uriTrackIds[i]);
+            trackIds.add(new Track.Id(Long.parseLong(uriTrackId)));
         }
         return trackIds;
     }
@@ -202,17 +211,17 @@ public class ShareContentProvider extends CustomContentProvider implements ICont
     public ParcelFileDescriptor openFile(@NonNull Uri uri, @NonNull String mode) throws FileNotFoundException {
         ContentProviderUtils contentProviderUtils = new ContentProviderUtils(this);
 
-        long[] trackIds = parseURI(uri);
+        Set<Track.Id> trackIds = parseURI(uri);
-        final Track[] tracks = new Track[trackIds.length];
+        final ArrayList<Track> tracks = new ArrayList<>();
-        for (int i = 0; i < trackIds.length; i++) {
+        for (Track.Id trackId : trackIds) {
-            tracks[i] = contentProviderUtils.getTrack(trackIds[i]);
+            tracks.add(contentProviderUtils.getTrack(trackId));
         }
 
-        final TrackExporter trackExporter = getTrackFileFormat(uri).newTrackExporter(getContext(), tracks);
+        final TrackExporter trackExporter = getTrackFileFormat(uri).newTrackExporter(getContext());
 
-        PipeDataWriter<String> pipeDataWriter = (PipeDataWriter<String>) (output, uri1, mimeType, opts, args) -> {
+        PipeDataWriter<String> pipeDataWriter = (output, uri1, mimeType, opts, args) -> {
             try (FileOutputStream fileOutputStream = new FileOutputStream(output.getFileDescriptor())) {
-                trackExporter.writeTrack(getContext(), fileOutputStream);
+                trackExporter.writeTrack(tracks.toArray(new Track[0]), fileOutputStream);
             } catch (IOException e) {
                 Log.w(TAG, "there occurred an error while sharing a file: " + e);
             }

src/main/java/de/dennisguse/opentracks/content/provider/TrackPointIterator.java

@@ -6,6 +6,7 @@ import android.util.Log;
 import java.util.Iterator;
 import java.util.NoSuchElementException;
 
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TrackPoint;
 
 /**
@@ -16,14 +17,14 @@ public class TrackPointIterator implements Iterator<TrackPoint>, AutoCloseable {
     private static final String TAG = TrackPointIterator.class.getSimpleName();
 
     private final ContentProviderUtils contentProviderUtils;
-    private final long trackId;
+    private final Track.Id trackId;
     private final boolean descending;
     private final CachedTrackPointsIndexes indexes;
     private long lastTrackPointId = -1L;
     private Cursor cursor;
 
 
-    public TrackPointIterator(ContentProviderUtils contentProviderUtils, long trackId, long startTrackPointId, boolean descending) {
+    public TrackPointIterator(ContentProviderUtils contentProviderUtils, Track.Id trackId, long startTrackPointId, boolean descending) {
         this.contentProviderUtils = contentProviderUtils;
         this.trackId = trackId;
         this.descending = descending;

src/main/java/de/dennisguse/opentracks/fragments/ConfirmDeleteDialogFragment.java

@@ -25,6 +25,7 @@ import androidx.fragment.app.DialogFragment;
 import androidx.fragment.app.FragmentManager;
 
 import de.dennisguse.opentracks.R;
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.util.DialogUtils;
 
 /**
@@ -44,9 +45,9 @@ public class ConfirmDeleteDialogFragment extends DialogFragment {
      *
      * @param trackIds list of track ids to delete.
      */
-    public static void showDialog(FragmentManager fragmentManager, long[] trackIds) {
+    public static void showDialog(FragmentManager fragmentManager, Track.Id... trackIds) {
         Bundle bundle = new Bundle();
-        bundle.putLongArray(KEY_TRACK_IDS, trackIds);
+        bundle.putParcelableArray(KEY_TRACK_IDS, trackIds);
 
         ConfirmDeleteDialogFragment deleteTrackDialogFragment = new ConfirmDeleteDialogFragment();
         deleteTrackDialogFragment.setArguments(bundle);
@@ -66,7 +67,7 @@ public class ConfirmDeleteDialogFragment extends DialogFragment {
     @Override
     @NonNull
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        final long[] trackIds = getArguments().getLongArray(KEY_TRACK_IDS);
+        final Track.Id[] trackIds = (Track.Id[]) getArguments().getParcelableArray(KEY_TRACK_IDS);
 
         int titleId = trackIds.length > 1 ? R.string.generic_delete_selected_confirm_title : R.string.track_delete_one_confirm_title;
         int messageId = trackIds.length > 1 ? R.string.track_delete_multiple_confirm_message : R.string.track_delete_one_confirm_message;
@@ -85,6 +86,6 @@ public class ConfirmDeleteDialogFragment extends DialogFragment {
      */
     public interface ConfirmDeleteCaller {
 
-        void onConfirmDeleteDone(long[] trackIds);
+        void onConfirmDeleteDone(Track.Id... trackIds);
     }
 }

src/main/java/de/dennisguse/opentracks/fragments/DeleteMarkerDialogFragment.java

@@ -26,6 +26,7 @@ import androidx.fragment.app.FragmentActivity;
 import androidx.fragment.app.FragmentManager;
 
 import de.dennisguse.opentracks.R;
+import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.util.DialogUtils;
 
@@ -41,9 +42,9 @@ public class DeleteMarkerDialogFragment extends DialogFragment {
 
     private DeleteMarkerCaller caller;
 
-    public static void showDialog(FragmentManager fragmentManager, long[] markerIds) {
+    public static void showDialog(FragmentManager fragmentManager, Waypoint.Id... waypointIds) {
         Bundle bundle = new Bundle();
-        bundle.putLongArray(KEY_MARKER_IDS, markerIds);
+        bundle.putParcelableArray(KEY_MARKER_IDS, waypointIds);
 
         DeleteMarkerDialogFragment deleteMarkerDialogFragment = new DeleteMarkerDialogFragment();
         deleteMarkerDialogFragment.setArguments(bundle);
@@ -63,23 +64,23 @@ public class DeleteMarkerDialogFragment extends DialogFragment {
     @Override
     @NonNull
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        final long[] markerIds = getArguments().getLongArray(KEY_MARKER_IDS);
+        final Waypoint.Id[] waypointIds = (Waypoint.Id[]) getArguments().getParcelableArray(KEY_MARKER_IDS);
 
         final FragmentActivity fragmentActivity = getActivity();
         int titleId;
         int messageId;
-        if (markerIds.length == 1 && markerIds[0] == -1L) {
+        if (waypointIds == null) {
             titleId = R.string.generic_delete_all_confirm_title;
             messageId = R.string.marker_delete_all_confirm_message;
         } else {
-            titleId = markerIds.length > 1 ? R.string.generic_delete_selected_confirm_title : R.string.marker_delete_one_confirm_title;
+            titleId = waypointIds.length > 1 ? R.string.generic_delete_selected_confirm_title : R.string.marker_delete_one_confirm_title;
-            messageId = markerIds.length > 1 ? R.string.marker_delete_multiple_confirm_message : R.string.marker_delete_one_confirm_message;
+            messageId = waypointIds.length > 1 ? R.string.marker_delete_multiple_confirm_message : R.string.marker_delete_one_confirm_message;
         }
         return DialogUtils.createConfirmationDialog(
                 fragmentActivity, titleId, getString(messageId), (dialog, which) -> new Thread(() -> {
                     ContentProviderUtils contentProviderUtils = new ContentProviderUtils(fragmentActivity);
-                    for (long markerId : markerIds) {
+                    for (Waypoint.Id waypointId : waypointIds) {
-                        contentProviderUtils.deleteWaypoint(getContext(), markerId);
+                        contentProviderUtils.deleteWaypoint(getContext(), waypointId);
                     }
                     caller.onDeleteMarkerDone();
                 }).start());

src/main/java/de/dennisguse/opentracks/fragments/ExportProgressDialogFragment.java

@@ -206,10 +206,10 @@ public class ExportProgressDialogFragment extends DialogFragment {
         }
 
         private Boolean exportTrack(Context context, Track track) {
-            TrackExporter trackExporter = trackFileFormat.newTrackExporter(context, new Track[]{track});
+            TrackExporter trackExporter = trackFileFormat.newTrackExporter(context);
 
             //TODO Move to helper function
-            String fileName = track.getId() + "." + trackFileFormat.getExtension();
+            String fileName = track.getId().getId() + "." + trackFileFormat.getExtension();
 
             // Overwrite a file if it exists; DocumentFile.createFile() creates a new file appending a suffix if the displayname already exists.
             DocumentFile file = directory.findFile(fileName);
@@ -218,7 +218,7 @@ public class ExportProgressDialogFragment extends DialogFragment {
             }
 
             try (OutputStream outputStream = context.getContentResolver().openOutputStream(file.getUri())) {
-                if (trackExporter.writeTrack(context, outputStream)) {
+                if (trackExporter.writeTrack(track, outputStream)) {
                     return true;
                 } else {
                     if (!file.delete()) {

src/main/java/de/dennisguse/opentracks/fragments/ImportProgressDialogFragment.java

@@ -205,16 +205,16 @@ public class ImportProgressDialogFragment extends DialogFragment {
             if (TrackFileFormat.GPX.getExtension().equals(fileExtension)) {
                 trackImporter = new GpxFileTrackImporter(context);
             } else if (TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.getExtension().equals(fileExtension)) {
-                trackImporter = new KmlFileTrackImporter(ImportProgressDialogFragment.this.getContext(), -1L);
+                trackImporter = new KmlFileTrackImporter(ImportProgressDialogFragment.this.getContext());
             } else if (TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA_AND_PICTURES.getExtension().equals(fileExtension)) {
-                trackImporter = new KmzTrackImporter(context, -1L, file.getUri());
+                trackImporter = new KmzTrackImporter(context, file.getUri());
             } else {
                 Log.i(TAG, "Unsupported file format.");
                 return false;
             }
 
             try (InputStream inputStream = context.getContentResolver().openInputStream(file.getUri())) {
-                return trackImporter.importFile(inputStream) != -1L;
+                return trackImporter.importFile(inputStream) != null;
             } catch (IOException e) {
                 Log.e(TAG, "Unable to import file", e);
                 return false;

src/main/java/de/dennisguse/opentracks/fragments/MarkerDetailFragment.java

@@ -93,9 +93,9 @@ public class MarkerDetailFragment extends Fragment {
         }
     };
 
-    public static MarkerDetailFragment newInstance(long markerId) {
+    public static MarkerDetailFragment newInstance(Waypoint.Id waypointId) {
         Bundle bundle = new Bundle();
-        bundle.putLong(KEY_MARKER_ID, markerId);
+        bundle.putParcelable(KEY_MARKER_ID, waypointId);
 
         MarkerDetailFragment fragment = new MarkerDetailFragment();
         fragment.setArguments(bundle);
@@ -106,8 +106,8 @@ public class MarkerDetailFragment extends Fragment {
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        long markerId = getArguments().getLong(KEY_MARKER_ID);
+        Waypoint.Id waypointId = getArguments().getParcelable(KEY_MARKER_ID);
-        if (markerId == -1L) {
+        if (waypointId == null) {
             Log.d(TAG, "invalid marker id");
             getParentFragmentManager().popBackStack();
             return;
@@ -182,7 +182,7 @@ public class MarkerDetailFragment extends Fragment {
 
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
-        long markerId = getArguments().getLong(KEY_MARKER_ID);
+        Waypoint.Id waypointId = getArguments().getParcelable(KEY_MARKER_ID); //TODO Should only happen in onCreate?
         FragmentActivity fragmentActivity = getActivity();
         Intent intent;
         switch (item.getItemId()) {
@@ -191,7 +191,7 @@ public class MarkerDetailFragment extends Fragment {
                 return true;
             case R.id.marker_detail_edit:
                 intent = IntentUtils.newIntent(fragmentActivity, MarkerEditActivity.class)
-                        .putExtra(MarkerEditActivity.EXTRA_MARKER_ID, markerId);
+                        .putExtra(MarkerEditActivity.EXTRA_MARKER_ID, waypointId);
                 startActivity(intent);
                 return true;
             case R.id.marker_detail_share:
@@ -202,7 +202,7 @@ public class MarkerDetailFragment extends Fragment {
                 }
                 return true;
             case R.id.marker_detail_delete:
-                DeleteMarkerDialogFragment.showDialog(getChildFragmentManager(), new long[]{markerId});
+                DeleteMarkerDialogFragment.showDialog(getChildFragmentManager(), waypointId);
                 return true;
             default:
                 return super.onOptionsItemSelected(item);
@@ -216,7 +216,7 @@ public class MarkerDetailFragment extends Fragment {
      */
     private void updateWaypoint(boolean refresh) {
         if (refresh || waypoint == null) {
-            waypoint = contentProviderUtils.getWaypoint(getArguments().getLong(KEY_MARKER_ID));
+            waypoint = contentProviderUtils.getWaypoint(getArguments().getParcelable(KEY_MARKER_ID)); //TODO Should only happen in onCreate?
             if (waypoint == null) {
                 Log.d(TAG, "waypoint is null");
                 getParentFragmentManager().popBackStack();

src/main/java/de/dennisguse/opentracks/fragments/StatisticsRecordingFragment.java

@@ -53,8 +53,7 @@ public class StatisticsRecordingFragment extends Fragment implements TrackDataLi
     private TrackDataHub trackDataHub;
     private Handler handlerUpdateUI;
 
-    //TODO Initialize immediately and remove in onDestroy()
+    private TrackRecordingServiceConnection trackRecordingServiceConnection = new TrackRecordingServiceConnection();
-    private TrackRecordingServiceConnection trackRecordingServiceConnection;
 
     private TrackPoint lastTrackPoint = null;
     private TrackStatistics lastTrackStatistics = null;
@@ -77,12 +76,9 @@ public class StatisticsRecordingFragment extends Fragment implements TrackDataLi
             }
             if (PreferencesUtils.isKey(getContext(), R.string.recording_track_id_key, key)) {
                 recordingGpsAccuracy = PreferencesUtils.getRecordingGPSAccuracy(getContext());
-                if (PreferencesUtils.getRecordingTrackId(getContext()) != PreferencesUtils.RECORDING_TRACK_ID_DEFAULT) {
+                if (PreferencesUtils.getRecordingTrackId(getContext()).isValid()) {
                     // A recording track id has been set -> Resumes track and starts timer.
                     resumeTrackDataHub();
-                    if (trackRecordingServiceConnection == null) {
-                        trackRecordingServiceConnection = new TrackRecordingServiceConnection(null);
-                    }
                     trackRecordingServiceConnection.startConnection(getContext());
 
                     handlerUpdateUI.post(updateUIeachSecond);
@@ -222,8 +218,6 @@ public class StatisticsRecordingFragment extends Fragment implements TrackDataLi
         super.onResume();
         resumeTrackDataHub();
         PreferencesUtils.register(getContext(), sharedPreferenceChangeListener);
-
-        trackRecordingServiceConnection = new TrackRecordingServiceConnection(null);
         trackRecordingServiceConnection.startConnection(getContext());
 
         handlerUpdateUI.post(updateUIeachSecond);
@@ -241,11 +235,8 @@ public class StatisticsRecordingFragment extends Fragment implements TrackDataLi
     @Override
     public void onStop() {
         super.onStop();
-        if (trackRecordingServiceConnection != null) {
         trackRecordingServiceConnection.unbind(getContext());
     }
-        trackRecordingServiceConnection = null;
-    }
 
     @Override
     public void onDestroyView() {
@@ -296,6 +287,12 @@ public class StatisticsRecordingFragment extends Fragment implements TrackDataLi
         longitudeValue = null;
     }
 
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        trackRecordingServiceConnection = null;
+    }
+
     @Override
     public void onTrackUpdated(final Track track) {
         if (isResumed()) {
@@ -333,9 +330,10 @@ public class StatisticsRecordingFragment extends Fragment implements TrackDataLi
                         lastTrackPoint = null;
                     }
 
-                    if (lastTrackPoint != null) {
+                    TrackPoint trackPoint = lastTrackPoint; //NOTE: There seems to be a race condition; just fix the symptom for now.
-                        boolean hasFix = !LocationUtils.isLocationOld(lastTrackPoint.getLocation());
+                    if (trackPoint != null) {
-                        boolean hasGoodFix = TrackPointUtils.fulfillsAccuracy(lastTrackPoint, recordingGpsAccuracy);
+                        boolean hasFix = !LocationUtils.isLocationOld(trackPoint.getLocation());
+                        boolean hasGoodFix = TrackPointUtils.fulfillsAccuracy(trackPoint, recordingGpsAccuracy);
 
                         if (!hasFix || !hasGoodFix) {
                             lastTrackPoint = null;

src/main/java/de/dennisguse/opentracks/io/file/TrackFileFormat.java

@@ -5,7 +5,6 @@ import android.content.Context;
 import java.util.Locale;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.io.file.exporter.FileTrackExporter;
 import de.dennisguse.opentracks.io.file.exporter.GpxTrackWriter;
@@ -21,8 +20,8 @@ public enum TrackFileFormat {
 
     KML_ONLY_TRACK {
         @Override
-        public TrackWriter newTrackWriter(Context context, boolean multiple) {
+        public TrackWriter newTrackWriter(Context context) {
-            return new KmlTrackWriter(context, multiple, false, false, false);
+            return new KmlTrackWriter(context, false, false, false);
         }
 
         @Override
@@ -36,8 +35,8 @@ public enum TrackFileFormat {
     },
     KML_WITH_TRACKDETAIL {
         @Override
-        public TrackWriter newTrackWriter(Context context, boolean multiple) {
+        public TrackWriter newTrackWriter(Context context) {
-            return new KmlTrackWriter(context, multiple, true, false, false);
+            return new KmlTrackWriter(context, true, false, false);
         }
 
         @Override
@@ -51,8 +50,8 @@ public enum TrackFileFormat {
     },
     KML_WITH_TRACKDETAIL_AND_SENSORDATA {
         @Override
-        public TrackWriter newTrackWriter(Context context, boolean multiple) {
+        public TrackWriter newTrackWriter(Context context) {
-            return new KmlTrackWriter(context, multiple, true, true, false);
+            return new KmlTrackWriter(context, true, true, false);
         }
 
         @Override
@@ -69,12 +68,12 @@ public enum TrackFileFormat {
         private static final boolean exportPhotos = false;
 
         @Override
-        public TrackWriter newTrackWriter(Context context, boolean multiple) {
+        public TrackWriter newTrackWriter(Context context) {
-            return new KmlTrackWriter(context, multiple, false, false, exportPhotos);
+            return new KmlTrackWriter(context, false, false, exportPhotos);
         }
 
-        public TrackExporter newTrackExporter(Context context, Track[] tracks) {
+        public TrackExporter newTrackExporter(Context context) {
-            return newKmzTrackExporter(context, this.newTrackWriter(context, tracks.length > 1), tracks, exportPhotos);
+            return newKmzTrackExporter(context, this.newTrackWriter(context), exportPhotos);
         }
 
         @Override
@@ -96,12 +95,12 @@ public enum TrackFileFormat {
         private static final boolean exportPhotos = false;
 
         @Override
-        public TrackWriter newTrackWriter(Context context, boolean multiple) {
+        public TrackWriter newTrackWriter(Context context) {
-            return new KmlTrackWriter(context, multiple, true, false, exportPhotos);
+            return new KmlTrackWriter(context, true, false, exportPhotos);
         }
 
-        public TrackExporter newTrackExporter(Context context, Track[] tracks) {
+        public TrackExporter newTrackExporter(Context context) {
-            return newKmzTrackExporter(context, this.newTrackWriter(context, tracks.length > 1), tracks, exportPhotos);
+            return newKmzTrackExporter(context, this.newTrackWriter(context), exportPhotos);
         }
 
         @Override
@@ -124,8 +123,8 @@ public enum TrackFileFormat {
         private static final boolean exportPhotos = false;
 
         @Override
-        public TrackWriter newTrackWriter(Context context, boolean multiple) {
+        public TrackWriter newTrackWriter(Context context) {
-            return new KmlTrackWriter(context, multiple, true, true, exportPhotos);
+            return new KmlTrackWriter(context, true, true, exportPhotos);
         }
 
         @Override
@@ -133,8 +132,8 @@ public enum TrackFileFormat {
             return MIME_KMZ;
         }
 
-        public TrackExporter newTrackExporter(Context context, Track[] tracks) {
+        public TrackExporter newTrackExporter(Context context) {
-            return newKmzTrackExporter(context, this.newTrackWriter(context, tracks.length > 1), tracks, exportPhotos);
+            return newKmzTrackExporter(context, this.newTrackWriter(context), exportPhotos);
         }
 
         public String getExtension() {
@@ -153,8 +152,8 @@ public enum TrackFileFormat {
         private static final boolean exportPhotos = true;
 
         @Override
-        public TrackWriter newTrackWriter(Context context, boolean multiple) {
+        public TrackWriter newTrackWriter(Context context) {
-            return new KmlTrackWriter(context, multiple, true, true, exportPhotos);
+            return new KmlTrackWriter(context, true, true, exportPhotos);
         }
 
         @Override
@@ -162,8 +161,8 @@ public enum TrackFileFormat {
             return MIME_KMZ;
         }
 
-        public TrackExporter newTrackExporter(Context context, Track[] tracks) {
+        public TrackExporter newTrackExporter(Context context) {
-            return newKmzTrackExporter(context, newTrackWriter(context, tracks.length > 1), tracks, exportPhotos);
+            return newKmzTrackExporter(context, newTrackWriter(context), exportPhotos);
         }
 
         public String getExtension() {
@@ -178,7 +177,7 @@ public enum TrackFileFormat {
     },
     GPX {
         @Override
-        public TrackWriter newTrackWriter(Context context, boolean multiple) {
+        public TrackWriter newTrackWriter(Context context) {
             return new GpxTrackWriter(context.getString(R.string.app_name));
         }
 
@@ -196,12 +195,12 @@ public enum TrackFileFormat {
 
     private static final String MIME_KML = "application/vnd.google-earth.kml+xml";
 
-    private static TrackExporter newKmzTrackExporter(Context context, TrackWriter trackWriter, Track[] tracks, boolean exportPhotos) {
+    private static TrackExporter newKmzTrackExporter(Context context, TrackWriter trackWriter, boolean exportPhotos) {
         ContentProviderUtils contentProviderUtils = new ContentProviderUtils(context);
 
-        FileTrackExporter fileTrackExporter = new FileTrackExporter(contentProviderUtils, trackWriter, tracks);
+        FileTrackExporter fileTrackExporter = new FileTrackExporter(contentProviderUtils, trackWriter);
 
-        return new KmzTrackExporter(contentProviderUtils, fileTrackExporter, tracks, exportPhotos);
+        return new KmzTrackExporter(context, contentProviderUtils, fileTrackExporter, exportPhotos);
     }
 
     /**
@@ -209,19 +208,18 @@ public enum TrackFileFormat {
      */
     public abstract String getMimeType();
 
-    public TrackExporter newTrackExporter(Context context, Track[] tracks) {
+    public TrackExporter newTrackExporter(Context context) {
         ContentProviderUtils contentProviderUtils = new ContentProviderUtils(context);
-        TrackWriter trackWriter = newTrackWriter(context, tracks.length > 1);
+        TrackWriter trackWriter = newTrackWriter(context);
-        return new FileTrackExporter(contentProviderUtils, trackWriter, tracks);
+        return new FileTrackExporter(contentProviderUtils, trackWriter);
     }
 
     /**
      * Creates a new track writer for the format.
      *
      * @param context the context
-     * @param multiple true for writing multiple tracks
      */
-    public abstract TrackWriter newTrackWriter(Context context, boolean multiple);
+    public abstract TrackWriter newTrackWriter(Context context);
 
     /**
      * Returns the file extension for each format.

src/main/java/de/dennisguse/opentracks/io/file/exporter/FileTrackExporter.java

@@ -16,7 +16,6 @@
 
 package de.dennisguse.opentracks.io.file.exporter;
 
-import android.content.Context;
 import android.database.Cursor;
 import android.util.Log;
 
@@ -42,7 +41,6 @@ public class FileTrackExporter implements TrackExporter {
     private static final String TAG = FileTrackExporter.class.getSimpleName();
 
     private final ContentProviderUtils contentProviderUtils;
-    private final Track[] tracks;
     private final TrackWriter trackWriter;
 
     /**
@@ -50,29 +48,37 @@ public class FileTrackExporter implements TrackExporter {
      *
      * @param contentProviderUtils  the content provider utils
      * @param trackWriter           the track writer
-     * @param tracks                the tracks
      */
-    public FileTrackExporter(ContentProviderUtils contentProviderUtils, TrackWriter trackWriter, Track[] tracks) {
+    public FileTrackExporter(ContentProviderUtils contentProviderUtils, TrackWriter trackWriter) {
         this.contentProviderUtils = contentProviderUtils;
-        this.tracks = tracks;
         this.trackWriter = trackWriter;
     }
 
     @Override
-    public boolean writeTrack(@NonNull Context context, @NonNull OutputStream outputStream) {
+    public boolean writeTrack(Track track, @NonNull OutputStream outputStream) {
+        return writeTrack(new Track[]{track}, outputStream);
+    }
+
+    @Override
+    public boolean writeTrack(Track[] tracks, @NonNull OutputStream outputStream) {
         try {
             trackWriter.prepare(outputStream);
             trackWriter.writeHeader(tracks);
             for (Track track1 : tracks) {
                 writeWaypoints(track1);
             }
-            trackWriter.writeBeginTracks();
+            boolean hasMultipleTracks = tracks.length > 1;
+            if (hasMultipleTracks) {
+                trackWriter.writeMultiTrackBegin();
+            }
             long startTime = tracks[0].getTrackStatistics().getStartTime_ms();
             for (Track track : tracks) {
                 long offset = track.getTrackStatistics().getStartTime_ms() - startTime;
                 writeLocations(track, offset);
             }
-            trackWriter.writeEndTracks();
+            if (hasMultipleTracks) {
+                trackWriter.writeMultiTrackEnd();
+            }
             trackWriter.writeFooter();
             trackWriter.close();
 
@@ -92,7 +98,7 @@ public class FileTrackExporter implements TrackExporter {
          *  I am leaving the number of waypoints very high which should not be a problem, because we don't try to load them into objects all at the same time.
          */
         boolean hasWaypoints = false;
-        try (Cursor cursor = contentProviderUtils.getWaypointCursor(track.getId(), -1L, ContentProviderUtils.MAX_LOADED_WAYPOINTS_POINTS)) {
+        try (Cursor cursor = contentProviderUtils.getWaypointCursor(track.getId(), null, ContentProviderUtils.MAX_LOADED_WAYPOINTS_POINTS)) {
             if (cursor != null && cursor.moveToFirst()) {
                 for (int i = 0; i < cursor.getCount(); i++) {
                     if (Thread.interrupted()) {
@@ -121,7 +127,6 @@ public class FileTrackExporter implements TrackExporter {
         boolean wroteTrack = false;
         boolean wroteSegment = false;
         boolean isLastLocationValid = false;
-        int locationNumber = 0;
         TrackPoint lastTrackPoint = null;
 
         try (TrackPointIterator trackPointIterator = contentProviderUtils.getTrackPointLocationIterator(track.getId(), -1L, false)) {
@@ -133,7 +138,6 @@ public class FileTrackExporter implements TrackExporter {
                 TrackPoint trackPoint = trackPointIterator.next();
 
                 setLocationTime(trackPoint, offset);
-                locationNumber++;
 
                 boolean isLocationValid = LocationUtils.isValidLocation(trackPoint.getLocation());
                 boolean isSegmentValid = isLocationValid && isLastLocationValid;

src/main/java/de/dennisguse/opentracks/io/file/exporter/GpxTrackWriter.java

@@ -33,6 +33,7 @@ import de.dennisguse.opentracks.util.StringUtils;
  *
  * @author Sandor Dornbush
  */
+//TODO Export waypoints
 public class GpxTrackWriter implements TrackWriter {
 
     private static final NumberFormat ELEVATION_FORMAT = NumberFormat.getInstance(Locale.US);
@@ -93,10 +94,15 @@ public class GpxTrackWriter implements TrackWriter {
             printWriter.println("xmlns=\"http://www.topografix.com/GPX/1/1\"");
             printWriter.println("xmlns:topografix=\"http://www.topografix.com/GPX/Private/TopoGrafix/0/1\"");
             printWriter.println("xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"");
+            printWriter.println("xmlns:atom=\"http://www.w3.org/2005/Atom\"");
+            printWriter.println("xmlns:opentracks=\"http://opentracksapp.com/xmlschemas/v1\"");
             printWriter.println("xmlns:gpxtpx=\"http://www.garmin.com/xmlschemes/TrackPointExtension/v2\"");
-            printWriter.println("xsi:schemaLocation=\"http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd"
+            printWriter.println("xsi:schemaLocation=" +
+                    "\"http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd"
                     + " http://www.topografix.com/GPX/Private/TopoGrafix/0/1 http://www.topografix.com/GPX/Private/TopoGrafix/0/1/topografix.xsd"
-                    + " http://www.garmin.com/xmlschemas/TrackPointExtension/v2 https://www8.garmin.com/xmlschemas/TrackPointExtensionv2.xsd\">");
+                    + " http://www.garmin.com/xmlschemas/TrackPointExtension/v2 https://www8.garmin.com/xmlschemas/TrackPointExtensionv2.xsd"
+                    + " http://opentracksapp.com/xmlschemas/v1 http://opentracksapp.com/xmlschemas/OpenTracks_v1.xsd\">");
+
             printWriter.println("<metadata>");
 
             Track track = tracks[0];
@@ -127,7 +133,6 @@ public class GpxTrackWriter implements TrackWriter {
     public void writeWaypoint(Waypoint waypoint) {
         if (printWriter != null) {
             Location location = waypoint.getLocation();
-            if (location != null) {
             printWriter.println("<wpt " + formatLocation(location) + ">");
             if (location.hasAltitude()) {
                 printWriter.println("<ele>" + ELEVATION_FORMAT.format(location.getAltitude()) + "</ele>");
@@ -139,15 +144,14 @@ public class GpxTrackWriter implements TrackWriter {
             printWriter.println("</wpt>");
         }
     }
-    }
 
     @Override
-    public void writeBeginTracks() {
+    public void writeMultiTrackBegin() {
         // Do nothing
     }
 
     @Override
-    public void writeEndTracks() {
+    public void writeMultiTrackEnd() {
         // Do nothing
     }
 
@@ -158,7 +162,11 @@ public class GpxTrackWriter implements TrackWriter {
             printWriter.println("<name>" + StringUtils.formatCData(track.getName()) + "</name>");
             printWriter.println("<desc>" + StringUtils.formatCData(track.getDescription()) + "</desc>");
             printWriter.println("<type>" + StringUtils.formatCData(track.getCategory()) + "</type>");
-            printWriter.println("<extensions><topografix:color>c0c0c0</topografix:color></extensions>");
+
+            printWriter.println("<extensions>");
+            printWriter.println("<topografix:color>c0c0c0</topografix:color>");
+            printWriter.println("<opentracks:trackid>" + track.getUuid() + "</opentracks:trackid>");
+            printWriter.println("</extensions>");
         }
     }
 

src/main/java/de/dennisguse/opentracks/io/file/exporter/KmlTrackWriter.java

@@ -57,7 +57,6 @@ public class KmlTrackWriter implements TrackWriter {
     private static final String TRACK_ICON = "http://earth.google.com/images/kml-icons/track-directional/track-0.png";
 
     private final Context context;
-    private final boolean hasMultipleTracks;
     private final boolean exportPhotos;
     private final boolean exportTrackDetail;
     private final boolean exportSensorData;
@@ -74,14 +73,12 @@ public class KmlTrackWriter implements TrackWriter {
 
     /**
      * @param context           the context
-     * @param hasMultipleTracks should encode multiple tracks into one file?
      * @param exportTrackDetail should detailed information about the track be exported (e.g., title, description, waypoints, timing)?
      * @param exportSensorData  should {@link TrackPoint}'s sensor data be exported?
      * @param exportPhotos      should pictures be exported (if true: exports to KMZ)?
      */
-    public KmlTrackWriter(Context context, boolean hasMultipleTracks, boolean exportTrackDetail, boolean exportSensorData, boolean exportPhotos) {
+    public KmlTrackWriter(Context context, boolean exportTrackDetail, boolean exportSensorData, boolean exportPhotos) {
         this.context = context;
-        this.hasMultipleTracks = hasMultipleTracks;
         this.exportTrackDetail = exportTrackDetail;
         this.exportSensorData = exportSensorData;
         this.exportPhotos = exportPhotos;
@@ -108,7 +105,10 @@ public class KmlTrackWriter implements TrackWriter {
             printWriter.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
             printWriter.println("<kml xmlns=\"http://www.opengis.net/kml/2.2\"");
             printWriter.println("xmlns:gx=\"http://www.google.com/kml/ext/2.2\"");
-            printWriter.println("xmlns:atom=\"http://www.w3.org/2005/Atom\">");
+            printWriter.println("xmlns:atom=\"http://www.w3.org/2005/Atom\"");
+            printWriter.println("xmlns:opentracks=\"http://opentracksapp.com/xmlschemas/v1\">");
+            //TODO ADD xsi:schemaLocation here!
+
             printWriter.println("<Document>");
             printWriter.println("<open>1</open>");
             printWriter.println("<visibility>1</visibility>");
@@ -116,7 +116,7 @@ public class KmlTrackWriter implements TrackWriter {
             if (exportTrackDetail) {
                 Track track = tracks[0];
                 printWriter.println("<name>" + StringUtils.formatCData(track.getName()) + "</name>");
-                printWriter.println("<atom:author><atom:name>" + StringUtils.formatCData(context.getString(R.string.app_name)) + "</atom:name></atom:author>");
+                printWriter.println("<atom:generator>" + StringUtils.formatCData(context.getString(R.string.app_name)) + "</atom:generator>");
             }
 
             writeTrackStyle();
@@ -175,18 +175,16 @@ public class KmlTrackWriter implements TrackWriter {
         }
     }
 
-    @Override
+    public void writeMultiTrackBegin() {
-    public void writeBeginTracks() {
+        if (printWriter != null) {
-        if (printWriter != null && hasMultipleTracks) {
             printWriter.println("<Folder id=tour>");
             printWriter.println("<name>" + context.getString(R.string.generic_tracks) + "</name>");
             printWriter.println("<open>1</open>");
         }
     }
 
-    @Override
+    public void writeMultiTrackEnd() {
-    public void writeEndTracks() {
+        if (printWriter != null) {
-        if (printWriter != null && hasMultipleTracks) {
             printWriter.println("</Folder>");
         }
     }
@@ -204,6 +202,7 @@ public class KmlTrackWriter implements TrackWriter {
                 printWriter.println("<name>" + StringUtils.formatCData(track.getName()) + "</name>");
                 printWriter.println("<description>" + StringUtils.formatCData(track.getDescription()) + "</description>");
                 printWriter.println("<icon>" + StringUtils.formatCData(track.getIcon()) + "</icon>");
+                printWriter.println("<opentracks:trackid>" + track.getUuid() + "</opentracks:trackid>");
             }
 
             printWriter.println("<styleUrl>#" + TRACK_STYLE + "</styleUrl>");
@@ -389,7 +388,7 @@ public class KmlTrackWriter implements TrackWriter {
      * @param trackId  the track id containing the location
      * @param location the location
      */
-    private float getHeading(long trackId, Location location) {
+    private float getHeading(Track.Id trackId, Location location) {
         long trackPointId = contentProviderUtils.getTrackPointId(trackId, location);
         if (trackPointId == -1L) {
             return location.getBearing();

src/main/java/de/dennisguse/opentracks/io/file/exporter/KmzTrackExporter.java

@@ -42,6 +42,7 @@ import de.dennisguse.opentracks.util.FileUtils;
  * @author Jimmy Shih
  */
 public class KmzTrackExporter implements TrackExporter {
+
     private static final String KMZ_IMAGES_DIR = "images";
     public static final String KMZ_KML_FILE = "doc.kml";
 
@@ -49,27 +50,32 @@ public class KmzTrackExporter implements TrackExporter {
     private static final int BUFFER_SIZE = 4096;
 
     private final ContentProviderUtils contentProviderUtils;
-    private final TrackExporter fileTrackExporter;
+    private final FileTrackExporter fileTrackExporter;
-    private final Track[] tracks;
 
     private final boolean exportPhotos;
+    private Context context;
 
     /**
      * Constructor.
      *
+     * @param context the context
      * @param contentProviderUtils the content provider utils
      * @param trackExporter        the file track exporter
-     * @param tracks               the tracks to export
      */
-    public KmzTrackExporter(ContentProviderUtils contentProviderUtils, TrackExporter trackExporter, Track[] tracks, boolean exportPhotos) {
+    public KmzTrackExporter(Context context, ContentProviderUtils contentProviderUtils, FileTrackExporter trackExporter, boolean exportPhotos) {
+        this.context = context;
         this.contentProviderUtils = contentProviderUtils;
         this.fileTrackExporter = trackExporter;
-        this.tracks = tracks;
         this.exportPhotos = exportPhotos;
     }
 
     @Override
-    public boolean writeTrack(@NonNull Context context, @NonNull OutputStream outputStream) {
+    public boolean writeTrack(Track track, @NonNull OutputStream outputStream) {
+        return writeTrack(new Track[]{track}, outputStream);
+    }
+
+    @Override
+    public boolean writeTrack(Track[] tracks, @NonNull OutputStream outputStream) {
         ZipOutputStream zipOutputStream = null;
         try {
             zipOutputStream = new ZipOutputStream(outputStream);
@@ -78,7 +84,7 @@ public class KmzTrackExporter implements TrackExporter {
             ZipEntry zipEntry = new ZipEntry(KMZ_KML_FILE);
             zipOutputStream.putNextEntry(zipEntry);
 
-            boolean success = fileTrackExporter.writeTrack(context, zipOutputStream);
+            boolean success = fileTrackExporter.writeTrack(tracks, zipOutputStream);
             zipOutputStream.closeEntry();
             if (!success) {
                 Log.e(TAG, "Unable to write kml in kmz");
@@ -86,7 +92,7 @@ public class KmzTrackExporter implements TrackExporter {
             }
 
             // Add photos
-            if (exportPhotos) addImages(context, zipOutputStream);
+            if (exportPhotos) addImages(context, tracks ,zipOutputStream);
             return true;
         } catch (InterruptedException | IOException e) {
             Log.e(TAG, "Unable to write track", e);
@@ -102,9 +108,9 @@ public class KmzTrackExporter implements TrackExporter {
         }
     }
 
-    private void addImages(Context context, ZipOutputStream zipOutputStream) throws InterruptedException, IOException {
+    private void addImages(Context context, Track[] tracks, ZipOutputStream zipOutputStream) throws InterruptedException, IOException {
         for (Track track : tracks) {
-            try (Cursor cursor = contentProviderUtils.getWaypointCursor(track.getId(), -1L, -1)) {
+            try (Cursor cursor = contentProviderUtils.getWaypointCursor(track.getId(), null, -1)) {
                 if (cursor != null && cursor.moveToFirst()) {
                     for (int i = 0; i < cursor.getCount(); i++) {
                         if (Thread.interrupted()) {

src/main/java/de/dennisguse/opentracks/io/file/exporter/TrackExporter.java

@@ -16,12 +16,12 @@
 
 package de.dennisguse.opentracks.io.file.exporter;
 
-import android.content.Context;
-
 import androidx.annotation.NonNull;
 
 import java.io.OutputStream;
 
+import de.dennisguse.opentracks.content.data.Track;
+
 /**
  * Track exporting for exporting track to an {@link OutputStream}.
  *
@@ -29,12 +29,7 @@ import java.io.OutputStream;
  */
 public interface TrackExporter {
 
-    /**
+    boolean writeTrack(Track[] tracks, @NonNull OutputStream outputStream);
-     * Write track to an output stream.
+
-     * Depending on the implementation a context might be required.
+    boolean writeTrack(Track track, @NonNull OutputStream outputStream);
-     *
-     * @param context the context
-     * @param outputStream the output stream
-     */
-    boolean writeTrack(@NonNull Context context, @NonNull OutputStream outputStream);
 }

src/main/java/de/dennisguse/opentracks/io/file/exporter/TrackWriter.java

@@ -32,7 +32,7 @@ import de.dennisguse.opentracks.content.data.Waypoint;
  *     For each waypoint:
  *         {@link #writeWaypoint(Waypoint)}
  *     {@link #writeEndWaypoints()}
- * {@link #writeBeginTracks()}
+ * {@link #writeMultiTrackBegin()}
  * For each track:
  *     {@link #writeBeginTrack(Track, TrackPoint)}
  *     For each segment:
@@ -41,7 +41,7 @@ import de.dennisguse.opentracks.content.data.Waypoint;
  *             {@link #writeTrackPoint(TrackPoint)}
  *         {@link #writeCloseSegment()}
  *     {@link #writeEndTrack(Track, TrackPoint)}
- * {@link #writeEndTracks()}
+ * {@link #writeMultiTrackEnd()}
  * {@link #writeFooter()}
  * {@link #close()}
  * </pre>
@@ -96,12 +96,12 @@ public interface TrackWriter {
     /**
      * Writes the beginning of the tracks.
      */
-    void writeBeginTracks();
+    void writeMultiTrackBegin();
 
     /**
      * Writes the end of the tracks,
      */
-    void writeEndTracks();
+    void writeMultiTrackEnd();
 
     /**
      * Writes the beginning of a track.

src/main/java/de/dennisguse/opentracks/io/file/importer/AbstractFileTrackImporter.java

@@ -17,6 +17,7 @@
 package de.dennisguse.opentracks.io.file.importer;
 
 import android.content.Context;
+import android.database.sqlite.SQLiteConstraintException;
 import android.net.Uri;
 import android.util.Log;
 
@@ -62,12 +63,13 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
 
     // The maximum number of buffered locations for bulk-insertion
     private static final int MAX_BUFFERED_LOCATIONS = 512;
+
     private final Context context;
-    private final long importTrackId;
     private final ContentProviderUtils contentProviderUtils;
     private final int recordingDistanceInterval;
 
-    private final List<Long> trackIds = new ArrayList<>();
+    private Track.Id importTrackId;
+    private final List<Track.Id> trackIds = new ArrayList<>();
     private final List<Waypoint> waypoints = new ArrayList<>();
 
     // The current element content
@@ -96,19 +98,17 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
     // The SAX locator to get the current line information
     private Locator locator;
 
-    /**
+    AbstractFileTrackImporter(Context context, ContentProviderUtils contentProviderUtils) {
-     * @param context       the context
-     * @param importTrackId the track id to import to. -1L to import to a new track.
-     */
-    @Deprecated
-    // Remove importTrackId
-    AbstractFileTrackImporter(Context context, long importTrackId, ContentProviderUtils contentProviderUtils) {
         this.context = context;
-        this.importTrackId = importTrackId;
         this.contentProviderUtils = contentProviderUtils;
         this.recordingDistanceInterval = PreferencesUtils.getRecordingDistanceInterval(context);
     }
 
+    AbstractFileTrackImporter(Context context, ContentProviderUtils contentProviderUtils, Track.Id importTrackId) {
+        this(context, contentProviderUtils);
+        this.importTrackId = importTrackId;
+    }
+
     @Override
     public void setDocumentLocator(Locator locator) {
         this.locator = locator;
@@ -126,7 +126,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
     }
 
     @Override
-    public long importFile(InputStream inputStream) {
+    public Track.Id importFile(InputStream inputStream) {
         try {
             SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
             long start = System.currentTimeMillis();
@@ -134,15 +134,13 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
             saxParser.parse(inputStream, this);
             Log.d(TAG, "Total import time: " + (System.currentTimeMillis() - start) + "ms");
             if (trackIds.size() != 1) {
-                Log.d(TAG, trackIds.size() + " tracks imported");
+                throw new MultiTracksImportException();
-                cleanImport();
-                return -1L;
             }
             return trackIds.get(0);
-        } catch (IOException | SAXException | ParserConfigurationException e) {
+        } catch (MultiTracksImportException | IOException | SAXException | SQLiteConstraintException | ParserConfigurationException e) {
             Log.e(TAG, "Unable to import file", e);
             cleanImport();
-            return -1L;
+            return null;
         }
     }
 
@@ -155,7 +153,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
         if (size == 0) {
             return;
         }
-        long trackId = trackIds.get(size - 1);
+        Track.Id trackId = trackIds.get(size - 1);
         Track track = contentProviderUtils.getTrack(trackId);
         if (track == null) {
             return;
@@ -227,16 +225,16 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
      */
     protected void onTrackStart() throws SAXException {
         trackData = new TrackData();
-        long trackId;
+        Track.Id trackId;
-        if (importTrackId == -1L) {
+        if (importTrackId == null) {
             Uri uri = contentProviderUtils.insertTrack(trackData.track);
-            trackId = Long.parseLong(uri.getLastPathSegment());
+            trackId = new Track.Id(Long.parseLong(uri.getLastPathSegment()));
         } else {
             if (trackIds.size() > 0) {
                 throw new SAXException(createErrorMessage("Cannot import more than one track to an existing track " + importTrackId));
             }
             trackId = importTrackId;
-            contentProviderUtils.clearTrack(context, trackId);
+            contentProviderUtils.clearTrack(trackId);
         }
         trackIds.add(trackId);
         trackData.track.setId(trackId);
@@ -275,7 +273,18 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
             trackData.trackStatisticsUpdater.updateTime(trackData.importTime);
         }
         trackData.track.setTrackStatistics(trackData.trackStatisticsUpdater.getTrackStatistics());
+
+        try {
             contentProviderUtils.updateTrack(trackData.track);
+        } catch (SQLiteConstraintException e) {
+            if (PreferencesUtils.getPreventReimportTracks(context)) {
+                throw e;
+            }
+
+            //TODO This is a workaround until we have proper UI.
+            trackData.track.setUuid(UUID.randomUUID());
+            contentProviderUtils.updateTrack(trackData.track);
+        }
     }
 
     /**
@@ -390,7 +399,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
      * @param externalPhotoUrl the file name
      */
     protected String getInternalPhotoUrl(String externalPhotoUrl) {
-        if (importTrackId == -1L) {
+        if (importTrackId == null) {
             Log.e(TAG, "Track id is invalid.");
             return null;
         }
@@ -508,7 +517,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
      * Cleans up import.
      */
     private void cleanImport() {
-        for (long trackId : trackIds) {
+        for (Track.Id trackId : trackIds) {
             contentProviderUtils.deleteTrack(context, trackId);
         }
     }
@@ -544,4 +553,9 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
         // The number of buffered locations
         int numBufferedTrackPoints = 0;
     }
+
+    @Deprecated
+    //TODO According to the reader AND writer, we support multiple tracks per file; we should implement it here also.
+    private static class MultiTracksImportException extends RuntimeException {
+    }
 }

src/main/java/de/dennisguse/opentracks/io/file/importer/GpxFileTrackImporter.java

@@ -45,6 +45,7 @@ public class GpxFileTrackImporter extends AbstractFileTrackImporter {
     private static final String TAG_TRACK_SEGMENT = "trkseg";
     private static final String TAG_TYPE = "type";
     private static final String TAG_WAYPOINT = "wpt";
+    private static final String TAG_ID = "opentracks:trackid";
 
     private static final String ATTRIBUTE_LAT = "lat";
     private static final String ATTRIBUTE_LON = "lon";
@@ -64,7 +65,7 @@ public class GpxFileTrackImporter extends AbstractFileTrackImporter {
 
     @VisibleForTesting
     GpxFileTrackImporter(Context context, ContentProviderUtils contentProviderUtils) {
-        super(context, -1L, contentProviderUtils);
+        super(context, contentProviderUtils);
     }
 
     @Override
@@ -144,6 +145,10 @@ public class GpxFileTrackImporter extends AbstractFileTrackImporter {
                     cadence = content.trim();
                 }
                 break;
+            case TAG_ID:
+                if (content != null) {
+                    uuid = content.trim();
+                }
         }
 
         // Reset element content

src/main/java/de/dennisguse/opentracks/io/file/importer/KmlFileTrackImporter.java

@@ -57,6 +57,7 @@ public class KmlFileTrackImporter extends AbstractFileTrackImporter {
     private static final String TAG_STYLE_URL = "styleUrl";
     private static final String TAG_VALUE = "value";
     private static final String TAG_WHEN = "when";
+    private static final String TAG_UUID = "opentracks:trackid";
 
     private static final String ATTRIBUTE_NAME = "name";
 
@@ -68,23 +69,17 @@ public class KmlFileTrackImporter extends AbstractFileTrackImporter {
     private ArrayList<Float> heartRateList;
     private ArrayList<Float> powerList;
 
-    /**
+    public KmlFileTrackImporter(Context context) {
-     * @param context       the context
+        this(context, new ContentProviderUtils(context));
-     * @param importTrackId track id to import to. This should not be -1L so that images in the kmz file can be imported.
-     */
-    @Deprecated //TODO Do not pass importTrackId here; get it from somewhere else
-    public KmlFileTrackImporter(Context context, long importTrackId) {
-        this(context, importTrackId, new ContentProviderUtils(context));
     }
 
     @VisibleForTesting
-    KmlFileTrackImporter(Context context, long importTrackId, ContentProviderUtils contentProviderUtils) {
+    KmlFileTrackImporter(Context context, ContentProviderUtils contentProviderUtils) {
-        super(context, importTrackId, contentProviderUtils);
+        super(context, contentProviderUtils);
     }
 
     @Override
-    public void startElement(String uri, String localName, String tag, Attributes attributes)
+    public void startElement(String uri, String localName, String tag, Attributes attributes) throws SAXException {
-            throws SAXException {
         switch (tag) {
             case TAG_PLACEMARK:
             case TAG_PHOTO_OVERLAY:
@@ -109,50 +104,70 @@ public class KmlFileTrackImporter extends AbstractFileTrackImporter {
 
     @Override
     public void endElement(String uri, String localName, String tag) throws SAXException {
-        //TODO Check if order is relevant (uses localname and tag); and convert to switch statement
+        switch (tag) {
-        if (tag.equals(TAG_KML)) {
+            case TAG_KML:
                 onFileEnd();
-        } else if (tag.equals(TAG_PLACEMARK) || tag.equals(TAG_PHOTO_OVERLAY)) {
+                break;
+            case TAG_PLACEMARK:
+            case TAG_PHOTO_OVERLAY:
                 // Note that a track is contained in a Placemark, calling onWaypointend is save since waypointType is not set for a track.
                 onWaypointEnd();
-        } else if (localName.equals(TAG_COORDINATES)) {
+                break;
+            case TAG_COORDINATES:
                 onWaypointLocationEnd();
-        } else if (tag.equals(TAG_GX_MULTI_TRACK)) {
+                break;
+            case TAG_GX_MULTI_TRACK:
                 onTrackEnd();
-        } else if (tag.equals(TAG_GX_TRACK)) {
+                break;
+            case TAG_GX_TRACK:
                 onTrackSegmentEnd();
-        } else if (tag.equals(TAG_GX_COORD)) {
+                break;
+            case TAG_GX_COORD:
                 onTrackPointEnd();
-        } else if (tag.equals(TAG_GX_VALUE)) {
+                break;
+            case TAG_GX_VALUE:
                 onExtendedDataValueEnd();
-        } else if (tag.equals(TAG_NAME)) {
+                break;
+            case TAG_NAME:
                 if (content != null) {
                     name = content.trim();
                 }
-        } else if (localName.equals(TAG_DESCRIPTION)) {
+                break;
+            case TAG_UUID:
+                if (content != null) {
+                    uuid = content.trim();
+                }
+                break;
+            case TAG_DESCRIPTION:
                 if (content != null) {
                     description = content.trim();
                 }
-        } else if (localName.equals(TAG_ICON)) {
+                break;
+            case TAG_ICON:
                 if (content != null) {
                     icon = content.trim();
                 }
-        } else if (localName.equals(TAG_VALUE)) {
+                break;
+            case TAG_VALUE:
                 if (content != null) {
                     category = content.trim();
                 }
-        } else if (localName.equals(TAG_WHEN)) {
+                break;
+            case TAG_WHEN:
                 if (content != null) {
                     time = content.trim();
                 }
-        } else if (localName.equals(TAG_STYLE_URL)) {
+                break;
+            case TAG_STYLE_URL:
                 if (content != null) {
                     waypointType = content.trim();
                 }
-        } else if (localName.equals(TAG_HREF)) {
+                break;
+            case TAG_HREF:
                 if (content != null) {
                     photoUrl = content.trim();
                 }
+                break;
         }
 
         // Reset element content

src/main/java/de/dennisguse/opentracks/io/file/importer/KmzTrackImporter.java

@@ -32,6 +32,7 @@ import java.util.List;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.io.file.exporter.KmzTrackExporter;
@@ -52,34 +53,31 @@ public class KmzTrackImporter implements TrackImporter {
     private static final int BUFFER_SIZE = 4096;
 
     private final Context context;
-    private final long importTrackId;
+    private Track.Id importTrackId; //TODO needed?
     private final Uri uriKmzFile;
 
     /**
      * @param context the context
-     * @param importTrackId track id to import to. This should not be -1L so that images in the kmz file can be imported.
      * @param uriFile URI of the kmz file.
      */
-    @Deprecated //TODO Do not pass importTrackId here; get it from somewhere else
+    public KmzTrackImporter(Context context, Uri uriFile) {
-    public KmzTrackImporter(Context context, long importTrackId, Uri uriFile) {
         this.context = context;
-        this.importTrackId = importTrackId;
         this.uriKmzFile = uriFile;
     }
 
     @Override
-    public long importFile(InputStream inputStream) {
+    public Track.Id importFile(InputStream inputStream) {
-        long trackId;
+        Track.Id trackId;
 
         if (!copyKmzImages()) {
             cleanImport(context, importTrackId);
-            return -1L;
+            return null;
         }
 
         trackId = findAndParseKmlFile(inputStream);
-        if (trackId == -1L) {
+        if (trackId == null) {
             cleanImport(context, importTrackId);
-            return -1L;
+            return null;
         }
 
         deleteOrphanImages(context, trackId);
@@ -158,27 +156,28 @@ public class KmzTrackImporter implements TrackImporter {
 
     /**
      * Finds KmzTrackExporter.KMZ_KML_FILE file inside kmz file (inputStream) and it parses it.
+     * TODO: May load multiple tracks, but only returns the last Track.Id.
      *
      * @param inputStream kmz input stream.
-     * @return            -1 if error or the id of the track otherwise.
+     * @return null if error or the id of the track otherwise.
      */
-    private long findAndParseKmlFile(InputStream inputStream) {
+    private Track.Id findAndParseKmlFile(InputStream inputStream) {
         try (ZipInputStream zipInputStream = new ZipInputStream(inputStream)) {
             ZipEntry zipEntry;
-            long trackId = -1L;
+            Track.Id trackId = null;
 
             while ((zipEntry = zipInputStream.getNextEntry()) != null) {
                 if (Thread.interrupted()) {
                     Log.d(TAG, "Thread interrupted");
-                    return -1L;
+                    return null;
                 }
 
                 String fileName = zipEntry.getName();
                 if (KmzTrackExporter.KMZ_KML_FILE.equals(fileName)) {
                     trackId = parseKml(zipInputStream);
-                    if (trackId == -1L) {
+                    if (trackId != null) {
                         Log.d(TAG, "Unable to parse kml in kmz");
-                        return -1L;
+                        return null;
                     }
                 }
 
@@ -187,7 +186,7 @@ public class KmzTrackImporter implements TrackImporter {
             return trackId;
         } catch (IOException e) {
             Log.e(TAG, "Unable to import file", e);
-            return -1L;
+            return null;
         }
     }
 
@@ -197,8 +196,8 @@ public class KmzTrackImporter implements TrackImporter {
      * @param context the Context object.
      * @param trackId the id of the Track.
      */
-    private void deleteOrphanImages(Context context, long trackId) {
+    private void deleteOrphanImages(Context context, Track.Id trackId) {
-        if (trackId != 1L) {
+        if (!trackId.isValid()) {
             // 1.- Gets all photo names in the waypoints of the track identified by id.
             ContentProviderUtils contentProviderUtils = new ContentProviderUtils(context);
             List<Waypoint> waypoints = contentProviderUtils.getWaypoints(trackId);
@@ -230,7 +229,7 @@ public class KmzTrackImporter implements TrackImporter {
      *
      * @param trackId the trackId
      */
-    private void cleanImport(Context context, long trackId) {
+    private void cleanImport(Context context, Track.Id trackId) {
         if (PreferencesUtils.isRecording(trackId)) {
             ContentProviderUtils contentProviderUtils = new ContentProviderUtils(context);
             contentProviderUtils.deleteTrack(context, trackId);
@@ -243,8 +242,8 @@ public class KmzTrackImporter implements TrackImporter {
      * @param zipInputStream the zip input stream
      * @return the imported track id or -1L
      */
-    private long parseKml(ZipInputStream zipInputStream) throws IOException {
+    private Track.Id parseKml(ZipInputStream zipInputStream) throws IOException {
-        KmlFileTrackImporter kmlFileTrackImporter = new KmlFileTrackImporter(context, importTrackId);
+        KmlFileTrackImporter kmlFileTrackImporter = new KmlFileTrackImporter(context);
 
         try (ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(getKml(zipInputStream))) {
             return kmlFileTrackImporter.importFile(byteArrayInputStream);
@@ -274,7 +273,7 @@ public class KmzTrackImporter implements TrackImporter {
      * @param fileName       the file name
      */
     private void readAndSaveImageFile(ZipInputStream zipInputStream, String fileName) throws IOException {
-        if (importTrackId == -1L || fileName.equals("")) {
+        if (importTrackId == null || fileName.equals("")) {
             return;
         }
 

src/main/java/de/dennisguse/opentracks/io/file/importer/TrackImporter.java

@@ -17,6 +17,8 @@ package de.dennisguse.opentracks.io.file.importer;
 
 import java.io.InputStream;
 
+import de.dennisguse.opentracks.content.data.Track;
+
 /**
  * Interface for a track importer.
  *
@@ -28,8 +30,8 @@ public interface TrackImporter {
      * Import a file.
      *
      * @param inputStream the file's input stream
-     * @return the imported track id or RECORDING_TRACK_ID_DEFAULT.
+     * @return the imported track id or null.
      */
     //TODO Figure out how can make the import an atomic operation (incl. database transaction rollback).
-    long importFile(InputStream inputStream);
+    Track.Id importFile(InputStream inputStream);
 }

src/main/java/de/dennisguse/opentracks/services/TrackRecordingService.java

@@ -33,6 +33,9 @@ import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 import androidx.core.app.TaskStackBuilder;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import de.dennisguse.opentracks.R;
 import de.dennisguse.opentracks.TrackListActivity;
 import de.dennisguse.opentracks.TrackRecordingActivity;
@@ -43,6 +46,7 @@ import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.content.provider.CustomContentProvider;
 import de.dennisguse.opentracks.content.provider.TrackPointIterator;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
+import de.dennisguse.opentracks.services.handlers.GpsStatusValue;
 import de.dennisguse.opentracks.services.handlers.HandlerServer;
 import de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager;
 import de.dennisguse.opentracks.services.tasks.AnnouncementPeriodicTaskFactory;
@@ -72,7 +76,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
     private PeriodicTaskExecutor voiceExecutor;
     private TrackRecordingServiceNotificationManager notificationManager;
 
-    private long recordingTrackId;
+    private Track.Id recordingTrackId;
     private boolean recordingTrackPaused;
     private int recordingDistanceInterval;
     private int maxRecordingDistance;
@@ -120,6 +124,8 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
 
     private HandlerServer handlerServer;
 
+    private List<TrackRecordingServiceCallback> listeners = new ArrayList<>();
+
     @Override
     public void onCreate() {
         super.onCreate();
@@ -132,7 +138,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
         notificationManager = new TrackRecordingServiceNotificationManager(this);
 
         // onSharedPreferenceChanged might not set recordingTrackId.
-        recordingTrackId = PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+        recordingTrackId = null;
 
         PreferencesUtils.register(this, sharedPreferenceChangeListener);
         sharedPreferenceChangeListener.onSharedPreferenceChanged(null, null);
@@ -152,7 +158,16 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
 
     @Override
     public void onDestroy() {
+        if (listeners != null) {
+            for (TrackRecordingServiceCallback listener : listeners) {
+                listener.onGpsStatusChange(GpsStatusValue.GPS_NONE);
+            }
+            listeners.clear();
+            listeners = null;
+        }
+
         handlerServer.stop(this);
+        handlerServer = null;
 
         if (remoteSensorManager != null) {
             remoteSensorManager.stop();
@@ -189,7 +204,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
         return recordingTrackPaused;
     }
 
-    public long getRecordingTrackId() {
+    public Track.Id getRecordingTrackId() {
         return recordingTrackId;
     }
 
@@ -215,9 +230,9 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
      *
      * @return the waypoint id
      */
-    public long insertWaypoint(String name, String category, String description, String photoUrl) {
+    public Waypoint.Id insertWaypoint(String name, String category, String description, String photoUrl) {
         if (!isRecording() || isPaused()) {
-            return -1L;
+            return null;
         }
 
         if (name == null) {
@@ -231,7 +246,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
         TrackPoint trackPoint = getLastValidTrackPointInCurrentSegment(recordingTrackId);
         if (trackPoint == null) {
             Log.i(TAG, "Could not create a waypoint as trackPoint is unknown.");
-            return -1L;
+            return null;
         }
 
         category = category != null ? category : "";
@@ -246,7 +261,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
         // Insert waypoint
         Waypoint waypoint = new Waypoint(name, description, category, icon, recordingTrackId, length, duration, trackPoint.getLocation(), photoUrl);
         Uri uri = contentProviderUtils.insertWaypoint(waypoint);
-        return ContentUris.parseId(uri);
+        return new Waypoint.Id(ContentUris.parseId(uri));
     }
 
     /**
@@ -254,10 +269,10 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
      *
      * @return the track id
      */
-    long startNewTrack() {
+    Track.Id startNewTrack() {
         if (isRecording()) {
             Log.d(TAG, "Ignore startNewTrack. Already recording.");
-            return -1L;
+            return null;
         }
         long now = System.currentTimeMillis();
         trackStatisticsUpdater = new TrackStatisticsUpdater(now);
@@ -265,7 +280,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
         // Insert a track
         Track track = new Track();
         Uri uri = contentProviderUtils.insertTrack(track);
-        long trackId = ContentUris.parseId(uri);
+        Track.Id trackId = new Track.Id(ContentUris.parseId(uri));
 
         // Update shared preferences
         updateRecordingState(trackId, false);
@@ -290,7 +305,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
      *
      * @param trackId the id of the track to be resumed.
      */
-    void resumeTrack(long trackId) {
+    void resumeTrack(Track.Id trackId) {
         Track track = contentProviderUtils.getTrack(trackId);
         if (track == null) {
             Log.e(TAG, "Ignore resumeTrack. Track " + trackId + " does not exists.");
@@ -318,7 +333,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
         if (track == null) {
             if (isRecording()) {
                 Log.w(TAG, "track is null, but recordingTrackId not -1L. " + recordingTrackId);
-                updateRecordingState(PreferencesUtils.RECORDING_TRACK_ID_DEFAULT, true);
+                updateRecordingState(null, true);
             }
             showNotification(false);
             return;
@@ -388,10 +403,10 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
         }
 
         // Need to remember the recordingTrackId before setting it to -1L
-        long trackId = recordingTrackId;
+        Track.Id trackId = recordingTrackId;
         boolean wasPaused = recordingTrackPaused;
 
-        updateRecordingState(PreferencesUtils.RECORDING_TRACK_ID_DEFAULT, true);
+        updateRecordingState(null, true);
 
         // Update database
         Track track = contentProviderUtils.getTrack(trackId);
@@ -474,7 +489,7 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
      * @param trackId the track id
      * @return the location or null
      */
-    private TrackPoint getLastValidTrackPointInCurrentSegment(long trackId) {
+    private TrackPoint getLastValidTrackPointInCurrentSegment(Track.Id trackId) {
         if (!currentSegmentHasTrackPoint()) {
             return null;
         }
@@ -492,9 +507,10 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
      * @param trackId the recording track id
      * @param paused  true if the recording is paused
      */
-    private void updateRecordingState(long trackId, boolean paused) {
+    private void updateRecordingState(Track.Id trackId, boolean paused) {
         recordingTrackId = trackId;
-        PreferencesUtils.setLong(this, R.string.recording_track_id_key, trackId);
+        long currentTrackId = trackId != null ? trackId.getId() : PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+        PreferencesUtils.setLong(this, R.string.recording_track_id_key, currentTrackId);
         recordingTrackPaused = paused;
         PreferencesUtils.setBoolean(this, R.string.recording_track_paused_key, recordingTrackPaused);
     }
@@ -581,6 +597,20 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
         lastTrackPoint = trackPoint;
     }
 
+    @Override
+    public void newGpsStatus(GpsStatusValue gpsStatusValue) {
+        if (listeners != null) {
+            notificationManager.updateContent(getString(gpsStatusValue.message));
+            for (TrackRecordingServiceCallback listener : listeners) {
+                listener.onGpsStatusChange(gpsStatusValue);
+            }
+        }
+    }
+
+    public void addListener(TrackRecordingServiceCallback listener) {
+        listeners.add(listener);
+    }
+
     /**
      * Inserts a trackPoint if this trackPoint is different than lastValidTrackPoint.
      *
@@ -679,4 +709,8 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
     public void setRemoteSensorManager(BluetoothRemoteSensorManager remoteSensorManager) {
         this.remoteSensorManager = remoteSensorManager;
     }
+
+    public GpsStatusValue getGpsStatus() {
+        return handlerServer.getGpsStatus();
+    }
 }

src/main/java/de/dennisguse/opentracks/services/TrackRecordingServiceBinder.java

@@ -2,8 +2,11 @@ package de.dennisguse.opentracks.services;
 
 import androidx.annotation.VisibleForTesting;
 
+import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TrackPoint;
+import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
+import de.dennisguse.opentracks.services.handlers.GpsStatusValue;
 import de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager;
 
 /**
@@ -22,6 +25,16 @@ class TrackRecordingServiceBinder extends android.os.Binder implements TrackReco
         this.trackRecordingService = trackRecordingService;
     }
 
+    @Override
+    public void addListener(TrackRecordingServiceCallback listener) {
+        trackRecordingService.addListener(listener);
+    }
+
+    @Override
+    public GpsStatusValue getGpsStatus() {
+        return trackRecordingService.getGpsStatus();
+    }
+
     @Override
     public void startGps() {
         trackRecordingService.tryStartGps();
@@ -32,12 +45,12 @@ class TrackRecordingServiceBinder extends android.os.Binder implements TrackReco
     }
 
     @Override
-    public long startNewTrack() {
+    public Track.Id startNewTrack() {
         return trackRecordingService.startNewTrack();
     }
 
     @Override
-    public void resumeTrack(long trackId) {
+    public void resumeTrack(Track.Id trackId) {
         trackRecordingService.resumeTrack(trackId);
     }
 
@@ -67,7 +80,7 @@ class TrackRecordingServiceBinder extends android.os.Binder implements TrackReco
     }
 
     @Override
-    public long getRecordingTrackId() {
+    public Track.Id getRecordingTrackId() {
         return trackRecordingService.getRecordingTrackId();
     }
 
@@ -77,7 +90,7 @@ class TrackRecordingServiceBinder extends android.os.Binder implements TrackReco
     }
 
     @Override
-    public long insertWaypoint(String name, String category, String description, String photoUrl) {
+    public Waypoint.Id insertWaypoint(String name, String category, String description, String photoUrl) {
         return trackRecordingService.insertWaypoint(name, category, description, photoUrl);
     }
 

src/main/java/de/dennisguse/opentracks/services/TrackRecordingServiceCallback.java

@@ -0,0 +1,10 @@
+package de.dennisguse.opentracks.services;
+
+import de.dennisguse.opentracks.services.handlers.GpsStatusValue;
+
+/**
+ * Interface all activities have to implements to receive information from the service.
+ */
+public interface TrackRecordingServiceCallback {
+    void onGpsStatusChange(GpsStatusValue newStatus);
+}