Release v3.4.0

Requires including androidx.documentfile directly.

.github/workflows/test.yml

@@ -0,0 +1,21 @@
+#https://github.com/marketplace/actions/android-emulator-runner
+name: Test
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        api-level: [21, 29]
+        target: [default]
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+
+      - name: run tests
+        uses: reactivecircus/android-emulator-runner@v2
+        with:
+          api-level: ${{ matrix.api-level }}
+          target: ${{ matrix.target }}
+          arch: x86_64
+          script: ./gradlew connectedCheck

.travis.yml

@@ -22,18 +22,18 @@ android:
     - android-29
 
 # Emulator Management: Create, Start and Wait
-#install:
-#  - echo y | sdkmanager "platform-tools"
-#  - echo y | sdkmanager --channel=4 "emulator"
-#  - echo y | sdkmanager "system-images;android-$API;$EMU_FLAVOR;$ABI"
-#  - echo no | avdmanager create avd --force -n test -k "system-images;android-$API;$EMU_FLAVOR;$ABI" -c 10M
-#  - emulator -verbose -avd test -no-accel -no-snapshot -no-window -camera-back none -camera-front none -selinux permissive -qemu -m 2048 &
-#  - android-wait-for-emulator
-#  - adb shell input keyevent 82 &
+install:
+  - echo y | sdkmanager "platform-tools"
+  - echo y | sdkmanager --channel=4 "emulator"
+  - echo y | sdkmanager "system-images;android-$API;$EMU_FLAVOR;$ABI"
+  - echo no | avdmanager create avd --force -n test -k "system-images;android-$API;$EMU_FLAVOR;$ABI" -c 10M
+  - emulator -verbose -avd test -no-accel -no-snapshot -no-window -camera-back none -camera-front none -selinux permissive -qemu -m 2048 &
+  - android-wait-for-emulator
+  - adb shell input keyevent 82 &
 
 script:
-  - ./gradlew clean build
-#  - ./gradlew connectedCheck
+  - ./gradlew build
+  - ./gradlew connectedCheck
 
 sbefore_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock

README_DEVELOPER.md

@@ -14,15 +14,15 @@ For the time being, the OpenTracks Data API can be used to implement mainly cust
 
 ## Implementation
 OpenTracks by default does not expose any data to 3rd-party applications.
-On the request of the user (i.e., pressing a button), an Intent is created that exposes the `Track` data (it's summary) as well as the `TrackPoint`s.
+On the request of the user (i.e., pressing a button), an Intent is created that exposes the `Track` data (it's summary) as well as the `TrackPoint`s of one or more selected tracks.
 For each, one URI is provided.
 These URIs notify observers if on content changes (e.g., a new `TrackPoint` was added).
 
 Limitations:
-* only tracks selected by the user is exposed,
+* only tracks selected by the user are exposed,
 * `Waypoints` are not exposed,
 * access is only granted temporarily and automatically revoked (see `FLAG_GRANT_READ_URI_PERMISSION`),
-* no write access is impossible, and
+* no write access is possible, and
 * neither track recordings can be started, paused, or stopped.
 
 All required information can be found in `IntentDashboardUtils.java`. 

build.gradle

@@ -98,6 +98,7 @@ android {
 dependencies {
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.preference:preference:1.1.0'
+    implementation 'androidx.documentfile:documentfile:1.0.1'
 
     androidTestImplementation 'androidx.test:core:1.2.0'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
@@ -109,5 +110,5 @@ dependencies {
 
     testImplementation 'androidx.test:core:1.2.0'
     testImplementation 'org.mockito:mockito-core:3.0.0'
-    implementation 'com.google.android.material:material:1.0.0'
+    implementation 'com.google.android.material:material:1.1.0'
 }

doc/activities.txt

@@ -0,0 +1,40 @@
+@startuml
+title
+State of OpenTracks
+end title
+
+legend right
+SettingsActivity can be reached
+from every activity showing a menu.
+endlegend
+
+[*] --> TrackListActivity
+TrackListActivity --> TrackDetailActivity : Start recording
+TrackListActivity --> SearchListActivity
+TrackListActivity --> MarkerListActivity : Show all markers
+TrackListActivity --> TrackDetailActivity : Show track
+TrackListActivity --> TrackDeleteActivity
+
+SearchListActivity --> MarkerDetailActivity : Search result
+SearchListActivity --> TrackDetailActivity : Search result
+
+TrackDetailActivity --> TrackDeleteActivity
+TrackDetailActivity --> TrackEditActivity
+TrackDetailActivity --> MarkerListActivity
+TrackDetailActivity --> MarkerEditActivity : Add marker
+TrackDetailActivity --> CameraIntent : Add marker (with photo)
+TrackDetailActivity --> ShareFileIntent
+TrackDetailActivity --> DashboardIntent : Database cursor
+TrackDetailActivity --> TrackOnMapIntent : KMZ
+
+MarkerListActivity --> MarkerDetailActivity
+
+MarkerDetailActivity --> MarkerEditActivity
+MarkerDetailActivity --> CoordinateOnMapIntent : URI
+
+SettingsActivity --> AboutActivity
+SettingsActivity --> HelpActivity
+SettingsActivity --> ExportActivity
+SettingsActivity --> ImportActivity
+
+@enduml

fastlane/metadata/android/en-US/changelogs/3272.txt

@@ -0,0 +1,11 @@
+v3.3.2: OpenTracks
+
+Changes:
+- Export: overwrites files now
+
+Bugfix:
+- Always remove recording notification
+
+Developer:
+- On API 26+ java.time is used for parsing and writing dates
+- Refactoring of TrackRecordingService

fastlane/metadata/android/en-US/changelogs/3287.txt

@@ -0,0 +1,12 @@
+v3.4.0: OpenTracks
+
+Changes:
+- Dashboard API: multiple tracks
+- Updated help
+
+Bugfix:
+- Fixed crash on fragment re-creation
+- When paused: prevent stopping app
+
+Developer:
+- Enable testing via CI (Github Actions and TravisCI)

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

@@ -38,6 +38,7 @@ import de.dennisguse.opentracks.content.SearchEngine.ScoredResult;
 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.stats.TripStatistics;
 
 /**

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

@@ -14,8 +14,9 @@
  * the License.
  */
 
-package de.dennisguse.opentracks.content;
+package de.dennisguse.opentracks.content.provider;
 
+import android.content.ContentUris;
 import android.content.Context;
 import android.database.sqlite.SQLiteDatabase;
 import android.net.Uri;
@@ -26,7 +27,6 @@ import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
-import de.dennisguse.opentracks.content.CustomContentProvider.DatabaseHelper;
 import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.data.TracksColumns;
 import de.dennisguse.opentracks.content.data.WaypointsColumns;
@@ -47,13 +47,13 @@ public class CustomContentProviderTest {
     @Before
     public void setUp() {
         context.deleteDatabase(DATABASE_NAME);
-        db = (new DatabaseHelper(context, DATABASE_NAME)).getWritableDatabase();
+        db = new CustomSQLiteOpenHelper(context, DATABASE_NAME).getWritableDatabase();
         customContentProvider = new CustomContentProvider() {
         };
     }
 
     /**
-     * Tests {@link CustomContentProvider.DatabaseHelper#onCreate(SQLiteDatabase)}.
+     * Tests {@link CustomSQLiteOpenHelper#onCreate(SQLiteDatabase)}.
      */
     @Test
     public void testDatabaseHelper_OnCreate() {
@@ -76,8 +76,13 @@ public class CustomContentProviderTest {
     @Test
     public void testGetType() {
         Assert.assertEquals(TracksColumns.CONTENT_TYPE, customContentProvider.getType(TracksColumns.CONTENT_URI));
-        Assert.assertEquals(TrackPointsColumns.CONTENT_TYPE, customContentProvider.getType(TrackPointsColumns.CONTENT_URI));
+        Assert.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));
+        Assert.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));
+        Assert.assertEquals(WaypointsColumns.CONTENT_ITEMTYPE, customContentProvider.getType(ContentUris.appendId(WaypointsColumns.CONTENT_URI.buildUpon(), 1).build()));
     }
 
     /**
@@ -142,7 +147,7 @@ public class CustomContentProviderTest {
         createTable(TrackPointsColumns.TABLE_NAME);
         createTable(WaypointsColumns.TABLE_NAME);
 
-        DatabaseHelper databaseHelper = new DatabaseHelper(context);
-        databaseHelper.onUpgrade(db, oldVersion, CustomContentProvider.DATABASE_VERSION);
+        CustomSQLiteOpenHelper databaseHelper = new CustomSQLiteOpenHelper(context);
+        databaseHelper.onUpgrade(db, oldVersion, CustomSQLiteOpenHelper.DATABASE_VERSION);
     }
 }

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

@@ -13,7 +13,7 @@
  * License for the specific language governing permissions and limitations under
  * the License.
  */
-package de.dennisguse.opentracks.content;
+package de.dennisguse.opentracks.content.provider;
 
 import android.content.ContentResolver;
 import android.content.ContentUris;
@@ -37,6 +37,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 
 import de.dennisguse.opentracks.content.data.TestDataUtil;
 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.data.TracksColumns;
 import de.dennisguse.opentracks.content.data.Waypoint;
@@ -75,16 +76,16 @@ public class CustomContentProviderUtilsTest {
 
     @Test
     public void testLocationIterator_noPoints() {
-        testIterator(1, 0, 1, false, LocationFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(1, 0, 1, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
     }
 
     @Test
     public void testLocationIterator_customFactory() {
-        final Location location = new Location("test_location");
+        final TrackPoint location = new TrackPoint("test_location");
         final AtomicInteger counter = new AtomicInteger();
-        testIterator(1, 15, 4, false, new LocationFactory() {
+        testIterator(1, 15, 4, false, new TrackPointFactory() {
             @Override
-            public Location createLocation() {
+            public TrackPoint createLocation() {
                 counter.incrementAndGet();
                 return location;
             }
@@ -105,45 +106,45 @@ public class CustomContentProviderUtilsTest {
 
     @Test
     public void testLocationIterator_noBatchAscending() {
-        testIterator(1, 50, 100, false, LocationFactory.DEFAULT_LOCATION_FACTORY);
-        testIterator(2, 50, 50, false, LocationFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(1, 50, 100, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(2, 50, 50, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
     }
 
     @Test
     public void testLocationIterator_noBatchDescending() {
-        testIterator(1, 50, 100, true, LocationFactory.DEFAULT_LOCATION_FACTORY);
-        testIterator(2, 50, 50, true, LocationFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(1, 50, 100, true, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(2, 50, 50, true, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
     }
 
     @Test
     public void testLocationIterator_batchAscending() {
-        testIterator(1, 50, 11, false, LocationFactory.DEFAULT_LOCATION_FACTORY);
-        testIterator(2, 50, 25, false, LocationFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(1, 50, 11, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(2, 50, 25, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
     }
 
     @Test
     public void testLocationIterator_batchDescending() {
-        testIterator(1, 50, 11, true, LocationFactory.DEFAULT_LOCATION_FACTORY);
-        testIterator(2, 50, 25, true, LocationFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(1, 50, 11, true, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(2, 50, 25, true, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
     }
 
     @Test
     public void testLocationIterator_largeTrack() {
-        testIterator(1, 20000, 2000, false, LocationFactory.DEFAULT_LOCATION_FACTORY);
+        testIterator(1, 20000, 2000, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
     }
 
-    private List<Location> testIterator(long trackId, int numPoints, int batchSize, boolean descending, LocationFactory locationFactory) {
+    private List<Location> testIterator(long trackId, int numPoints, int batchSize, boolean descending, TrackPointFactory trackPointFactory) {
         long lastPointId = initializeTrack(trackId, numPoints);
         ((ContentProviderUtils) contentProviderUtils).setDefaultCursorBatchSize(batchSize);
         List<Location> locations = new ArrayList<Location>(numPoints);
-        try (LocationIterator it = contentProviderUtils.getTrackPointLocationIterator(trackId, -1L, descending, locationFactory)) {
+        try (TrackPointIterator it = contentProviderUtils.getTrackPointLocationIterator(trackId, -1L, descending, trackPointFactory)) {
             while (it.hasNext()) {
                 Location loc = it.next();
                 Assert.assertNotNull(loc);
                 locations.add(loc);
                 // Make sure the IDs are returned in the right order.
                 Assert.assertEquals(descending ? lastPointId - locations.size() + 1
-                        : lastPointId - numPoints + locations.size(), it.getLocationId());
+                        : lastPointId - numPoints + locations.size(), it.getTrackPointId());
             }
             Assert.assertEquals(numPoints, locations.size());
         }
@@ -173,10 +174,10 @@ public class CustomContentProviderUtilsTest {
         // Load all inserted locations.
         long lastPointId = -1;
         int counter = 0;
-        try (LocationIterator it = contentProviderUtils.getTrackPointLocationIterator(id, -1L, false, LocationFactory.DEFAULT_LOCATION_FACTORY)) {
+        try (TrackPointIterator it = contentProviderUtils.getTrackPointLocationIterator(id, -1L, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY)) {
             while (it.hasNext()) {
                 it.next();
-                lastPointId = it.getLocationId();
+                lastPointId = it.getTrackPointId();
                 counter++;
             }
         }
@@ -229,7 +230,7 @@ public class CustomContentProviderUtilsTest {
         ContentResolver contentResolver = context.getContentResolver();
         Cursor tracksCursor = contentResolver.query(TracksColumns.CONTENT_URI, null, null, null, TracksColumns._ID);
         Assert.assertEquals(1, tracksCursor.getCount());
-        Cursor tracksPointsCursor = contentResolver.query(TrackPointsColumns.CONTENT_URI, null, null, null, TrackPointsColumns._ID);
+        Cursor tracksPointsCursor = contentResolver.query(TrackPointsColumns.CONTENT_URI_BY_ID, null, null, null, TrackPointsColumns._ID);
         Assert.assertEquals(10, tracksPointsCursor.getCount());
         Cursor waypointCursor = contentResolver.query(WaypointsColumns.CONTENT_URI, null, null, null, WaypointsColumns._ID);
         Assert.assertEquals(1, waypointCursor.getCount());
@@ -238,7 +239,7 @@ public class CustomContentProviderUtilsTest {
         // Check whether all have been deleted.
         tracksCursor = contentResolver.query(TracksColumns.CONTENT_URI, null, null, null, TracksColumns._ID);
         Assert.assertEquals(0, tracksCursor.getCount());
-        tracksPointsCursor = contentResolver.query(TrackPointsColumns.CONTENT_URI, null, null, null, TrackPointsColumns._ID);
+        tracksPointsCursor = contentResolver.query(TrackPointsColumns.CONTENT_URI_BY_ID, null, null, null, TrackPointsColumns._ID);
         Assert.assertEquals(0, tracksPointsCursor.getCount());
         waypointCursor = contentResolver.query(WaypointsColumns.CONTENT_URI, null, null, null, WaypointsColumns._ID);
         Assert.assertEquals(0, waypointCursor.getCount());
@@ -264,7 +265,7 @@ public class CustomContentProviderUtilsTest {
         ContentResolver contentResolver = context.getContentResolver();
         Cursor tracksCursor = contentResolver.query(TracksColumns.CONTENT_URI, null, null, null, TracksColumns._ID);
         Assert.assertEquals(3, tracksCursor.getCount());
-        Cursor tracksPointsCursor = contentResolver.query(TrackPointsColumns.CONTENT_URI, null, null, null, TrackPointsColumns._ID);
+        Cursor tracksPointsCursor = contentResolver.query(TrackPointsColumns.CONTENT_URI_BY_ID, null, null, null, TrackPointsColumns._ID);
         Assert.assertEquals(20, tracksPointsCursor.getCount());
         Cursor waypointCursor = contentResolver.query(WaypointsColumns.CONTENT_URI, null, null, null, WaypointsColumns._ID);
         Assert.assertEquals(1, waypointCursor.getCount());
@@ -273,7 +274,7 @@ public class CustomContentProviderUtilsTest {
         // 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());
-        tracksPointsCursor = contentResolver.query(TrackPointsColumns.CONTENT_URI, null, null, null, TrackPointsColumns._ID);
+        tracksPointsCursor = contentResolver.query(TrackPointsColumns.CONTENT_URI_BY_ID, null, null, null, TrackPointsColumns._ID);
         Assert.assertEquals(20, tracksPointsCursor.getCount());
         waypointCursor = contentResolver.query(WaypointsColumns.CONTENT_URI, null, null, null, WaypointsColumns._ID);
         Assert.assertEquals(0, waypointCursor.getCount());
@@ -414,7 +415,7 @@ public class CustomContentProviderUtilsTest {
 
     /**
      * Tests the method
-     * {@link ContentProviderUtils#deleteWaypoint(Context, long)}
+     * {@link ContentProviderUtils#deleteWaypoint(long)}
      * when there is only one waypoint in the track.
      */
     @Test
@@ -430,14 +431,14 @@ public class CustomContentProviderUtilsTest {
         contentProviderUtils.insertWaypoint(waypoint1);
 
         // Delete
-        contentProviderUtils.deleteWaypoint(context, 1);
+        contentProviderUtils.deleteWaypoint(1);
 
         Assert.assertNull(contentProviderUtils.getWaypoint(1));
     }
 
     /**
      * Tests the method
-     * {@link ContentProviderUtils#deleteWaypoint(Context, long)}
+     * {@link ContentProviderUtils#deleteWaypoint(long)}
      * when there is more than one waypoint in the track.
      */
     @Test
@@ -475,7 +476,7 @@ public class CustomContentProviderUtilsTest {
 
         // Delete
         Assert.assertNotNull(contentProviderUtils.getWaypoint(waypoint1Id));
-        contentProviderUtils.deleteWaypoint(context, waypoint1Id);
+        contentProviderUtils.deleteWaypoint(waypoint1Id);
         Assert.assertNull(contentProviderUtils.getWaypoint(waypoint1Id));
 
         Assert.assertEquals(MOCK_DESC, contentProviderUtils.getWaypoint(waypoint2Id).getDescription());
@@ -506,32 +507,6 @@ public class CustomContentProviderUtilsTest {
         Assert.assertEquals(4, contentProviderUtils.getNextWaypointNumber(trackId));
     }
 
-    /**
-     * Tests the method
-     * {@link ContentProviderUtils#getLastWaypoint(long)}.
-     */
-    @Test
-    public void testGetLastWaypoint() {
-        long trackId = System.currentTimeMillis();
-        Track track = TestDataUtil.getTrack(trackId, 10);
-        contentProviderUtils.insertTrack(track);
-
-        Waypoint waypoint1 = new Waypoint();
-        waypoint1.setTrackId(trackId);
-        waypoint1.setDescription("Desc1");
-        Waypoint waypoint2 = new Waypoint();
-        waypoint2.setTrackId(trackId);
-        waypoint2.setDescription("Desc2");
-        Waypoint waypoint3 = new Waypoint();
-        waypoint3.setTrackId(trackId);
-        waypoint3.setDescription("Desc3");
-        contentProviderUtils.insertWaypoint(waypoint1);
-        contentProviderUtils.insertWaypoint(waypoint2);
-        contentProviderUtils.insertWaypoint(waypoint3);
-
-        Assert.assertEquals("Desc3", contentProviderUtils.getLastWaypoint(trackId).getDescription());
-    }
-
     /**
      * Tests the method {@link ContentProviderUtils#insertWaypoint(Waypoint)} and
      * {@link ContentProviderUtils#getWaypoint(long)}.
@@ -715,7 +690,7 @@ public class CustomContentProviderUtilsTest {
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getTrackPointLocationIterator(long, long, boolean, LocationFactory)} in descending.
+     * Tests the method {@link ContentProviderUtils#getTrackPointLocationIterator(long, long, boolean, TrackPointFactory)} in descending.
      */
     @Test
     public void testGetTrackPointLocationIterator_desc() {
@@ -731,18 +706,18 @@ public class CustomContentProviderUtilsTest {
 
         long startTrackPointId = trackpointIds[9];
 
-        LocationIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(trackId, startTrackPointId, true, LocationFactory.DEFAULT_LOCATION_FACTORY);
+        TrackPointIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(trackId, startTrackPointId, true, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
         for (int i = 0; i < trackpointIds.length; i++) {
             Assert.assertTrue(locationIterator.hasNext());
             Location location = locationIterator.next();
-            Assert.assertEquals(startTrackPointId - i, locationIterator.getLocationId());
+            Assert.assertEquals(startTrackPointId - i, locationIterator.getTrackPointId());
             checkLocation((trackpointIds.length - 1) - i, location);
         }
         Assert.assertFalse(locationIterator.hasNext());
     }
 
     /**
-     * Tests the method {@link ContentProviderUtils#getTrackPointLocationIterator(long, long, boolean, LocationFactory)} in ascending.
+     * Tests the method {@link ContentProviderUtils#getTrackPointLocationIterator(long, long, boolean, TrackPointFactory)} in ascending.
      */
     @Test
     public void testGetTrackPointLocationIterator_asc() {
@@ -758,11 +733,11 @@ public class CustomContentProviderUtilsTest {
 
         long startTrackPointId = trackpointIds[0];
 
-        LocationIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(trackId, startTrackPointId, false, LocationFactory.DEFAULT_LOCATION_FACTORY);
+        TrackPointIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(trackId, startTrackPointId, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY);
         for (int i = 0; i < trackpointIds.length; i++) {
             Assert.assertTrue(locationIterator.hasNext());
             Location location = locationIterator.next();
-            Assert.assertEquals(startTrackPointId + i, locationIterator.getLocationId());
+            Assert.assertEquals(startTrackPointId + i, locationIterator.getTrackPointId());
 
             checkLocation(i, location);
         }
@@ -791,4 +766,12 @@ public class CustomContentProviderUtilsTest {
         contentProviderUtils.insertTrack(track);
         contentProviderUtils.bulkInsertTrackPoint(track.getLocations().toArray(new Location[0]), track.getLocations().size(), track.getId());
     }
+
+    @Test
+    public void testFormatIdListForUri() {
+        Assert.assertEquals("", ContentProviderUtils.formatIdListForUri(new long[]{}));
+        Assert.assertEquals("12", ContentProviderUtils.formatIdListForUri(new long[]{12}));
+        Assert.assertEquals("42,43,44", ContentProviderUtils.formatIdListForUri(new long[]{42, 43, 44}));
+    }
+
 }

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

@@ -61,8 +61,7 @@ public class ChartFragmentTest {
     @Before
     public void setUp() {
         boolean chartByDistance = false;
-        chartFragment = new ChartFragment(chartByDistance) {
-        };
+        chartFragment = (ChartFragment) ChartFragment.newInstance(chartByDistance);
         chartFragment.setChartView(new ChartView(ApplicationProvider.getApplicationContext(), chartByDistance));
         chartFragment.setTripStatisticsUpdater(TrackStubUtils.INITIAL_TIME);
     }

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

@@ -32,11 +32,11 @@ import java.text.SimpleDateFormat;
 import java.util.Locale;
 import java.util.SimpleTimeZone;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.Track;
 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;
 
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.eq;
@@ -57,9 +57,9 @@ public abstract class AbstractTestFileTrackImporter {
     static final double TRACK_ELEVATION = 324.0;
 
     static final String TRACK_TIME_0 = "2010-04-22T18:21:00Z";
-    static final String TRACK_TIME_1 = "2010-04-22T18:21:50.123";
-    static final String TRACK_TIME_2 = "2010-04-22T18:23:00.123";
-    static final String TRACK_TIME_3 = "2010-04-22T18:24:50.123";
+    static final String TRACK_TIME_1 = "2010-04-22T18:21:50.123Z";
+    static final String TRACK_TIME_2 = "2010-04-22T18:23:00.123Z";
+    static final String TRACK_TIME_3 = "2010-04-22T18:24:50.123Z";
 
     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);

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

@@ -19,10 +19,10 @@ import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.TestDataUtil;
 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.TrackFileFormat;
 import de.dennisguse.opentracks.io.file.exporter.TrackExporter;
 

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

@@ -42,10 +42,10 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
-import de.dennisguse.opentracks.content.CustomContentProvider;
 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.stats.TripStatistics;
 import de.dennisguse.opentracks.util.PreferencesUtils;
 
@@ -95,7 +95,7 @@ public class TrackRecordingServiceTest {
     @After
     public void tearDown() throws TimeoutException {
         // Reset service (if some previous test failed)
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(createStartIntent(context)));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(createStartIntent(context)));
         if (service.isRecording() || service.isPaused()) {
             service.endCurrentTrack();
         }
@@ -126,7 +126,7 @@ public class TrackRecordingServiceTest {
 
         Intent startIntent = createStartIntent(context);
         mServiceRule.startService(startIntent);
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(startIntent));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(startIntent));
 
         // Test if we start in no-recording mode by default.
         Assert.assertFalse(service.isRecording());
@@ -138,7 +138,7 @@ public class TrackRecordingServiceTest {
     public void testRecording_oldTracks() throws Exception {
         createDummyTrack(trackId, -1L, false);
 
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(createStartIntent(context)));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(createStartIntent(context)));
         Assert.assertFalse(service.isRecording());
         Assert.assertEquals(PreferencesUtils.RECORDING_TRACK_ID_DEFAULT, service.getRecordingTrackId());
     }
@@ -147,7 +147,7 @@ public class TrackRecordingServiceTest {
     @Test
     public void testRecording_orphanedRecordingTrack() throws Exception {
         Intent startIntent = createStartIntent(context);
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(startIntent));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(startIntent));
 
         // Just set recording track to a bogus value.
         // Make sure that the service will not start recording and will clear the bogus track.
@@ -161,7 +161,7 @@ public class TrackRecordingServiceTest {
     @MediumTest
     @Test
     public void testStartNewTrack_alreadyRecording() throws Exception {
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(createStartIntent(context)));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(createStartIntent(context)));
         service.startNewTrack();
         Assert.assertTrue(service.isRecording());
         long trackId = service.getRecordingTrackId();
@@ -178,7 +178,7 @@ public class TrackRecordingServiceTest {
     @MediumTest
     @Test
     public void testEndCurrentTrack_noRecording() throws Exception {
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(createStartIntent(context)));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(createStartIntent(context)));
         Assert.assertFalse(service.isRecording());
 
         // Ending the current track when there is no recording should not result in any error.
@@ -210,7 +210,7 @@ public class TrackRecordingServiceTest {
     /**
      * Inserts a location and waits for 200ms.
      */
-    private void insertLocation(ITrackRecordingService trackRecordingService) throws InterruptedException {
+    private void insertLocation(TrackRecordingServiceInterface trackRecordingService) throws InterruptedException {
         Location location = new Location("gps");
         location.setLongitude(35.0f);
         location.setLatitude(45.0f);
@@ -226,7 +226,7 @@ public class TrackRecordingServiceTest {
     @MediumTest
     @Test
     public void testInsertWaypointMarker_noRecordingTrack() throws Exception {
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(createStartIntent(context)));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(createStartIntent(context)));
         Assert.assertFalse(service.isRecording());
 
         long waypointId = service.insertWaypoint(null, null, null, null);
@@ -236,7 +236,7 @@ public class TrackRecordingServiceTest {
     @MediumTest
     @Test
     public void testInsertWaypointMarker_validWaypoint() throws Exception {
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(createStartIntent(context)));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(createStartIntent(context)));
         service.startNewTrack();
         Assert.assertTrue(service.isRecording());
         insertLocation(service);

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

@@ -25,9 +25,9 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
-import de.dennisguse.opentracks.content.CustomContentProvider;
 import de.dennisguse.opentracks.content.data.Track;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.CustomContentProvider;
 import de.dennisguse.opentracks.stats.TripStatistics;
 import de.dennisguse.opentracks.util.PreferencesUtils;
 
@@ -47,7 +47,7 @@ public class TrackRecordingServiceTestLooper {
 
     private Context context = ApplicationProvider.getApplicationContext();
 
-    private ContentProviderUtils providerUtils;
+    private ContentProviderUtils contentProviderUtils;
 
     @BeforeClass
     public static void preSetUp() {
@@ -67,26 +67,26 @@ public class TrackRecordingServiceTestLooper {
         };
         customContentProvider.attachInfo(context, null);
 
-        providerUtils = new ContentProviderUtils(context);
+        contentProviderUtils = new ContentProviderUtils(context);
 
         // Let's use default values.
         SharedPreferences sharedPreferences = PreferencesUtils.getSharedPreferences(context);
         sharedPreferences.edit().clear().apply();
 
         // Ensure that the database is empty before every test
-        providerUtils.deleteAllTracks(context);
+        contentProviderUtils.deleteAllTracks(context);
     }
 
     @After
     public void tearDown() throws TimeoutException {
         // Reset service (if some previous test failed)
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(TrackRecordingServiceTest.createStartIntent(context)));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(TrackRecordingServiceTest.createStartIntent(context)));
         if (service.isRecording() || service.isPaused()) {
             service.endCurrentTrack();
         }
 
         // Ensure that the database is empty after every test
-        providerUtils.deleteAllTracks(context);
+        contentProviderUtils.deleteAllTracks(context);
     }
 
     @MediumTest
@@ -186,20 +186,20 @@ public class TrackRecordingServiceTestLooper {
     @MediumTest
     @Test
     public void testIntegration_completeRecordingSession() throws TimeoutException {
-        List<Track> tracks = providerUtils.getAllTracks();
+        List<Track> tracks = contentProviderUtils.getAllTracks();
         Assert.assertTrue(tracks.isEmpty());
         fullRecordingSession();
     }
 
     private void fullRecordingSession() throws TimeoutException {
-        ITrackRecordingService service = ((ITrackRecordingService) mServiceRule.bindService(TrackRecordingServiceTest.createStartIntent(context)));
+        TrackRecordingServiceInterface service = ((TrackRecordingServiceInterface) mServiceRule.bindService(TrackRecordingServiceTest.createStartIntent(context)));
         Assert.assertFalse(service.isRecording());
 
         // Start a track.
         long id = service.startNewTrack();
         Assert.assertTrue(id >= 0);
         Assert.assertTrue(service.isRecording());
-        Track track = providerUtils.getTrack(id);
+        Track track = contentProviderUtils.getTrack(id);
         Assert.assertNotNull(track);
         Assert.assertEquals(id, track.getId());
         Assert.assertEquals(id, PreferencesUtils.getRecordingTrackId(context));
@@ -226,7 +226,7 @@ public class TrackRecordingServiceTestLooper {
         service.endCurrentTrack();
         Assert.assertFalse(service.isRecording());
         Assert.assertEquals(-1L, service.getRecordingTrackId());
-        track = providerUtils.getTrack(id);
+        track = contentProviderUtils.getTrack(id);
         Assert.assertNotNull(track);
         Assert.assertEquals(id, track.getId());
         TripStatistics tripStatistics = track.getTripStatistics();

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

@@ -115,27 +115,16 @@ public class StringUtilsTest {
     }
 
     /**
-     * Tests {@link StringUtils#getTime(String)}.
-     */
-    @Test
-    public void testGetTime() {
-        assertGetTime("2010-05-04T03:02:01", 2010, 5, 4, 3, 2, 1, 0);
-        assertGetTime("2010-05-04T03:02:01Z", 2010, 5, 4, 3, 2, 1, 0);
-    }
-
-    /**
-     * Tests {@link StringUtils#getTime(String)} with fractional seconds.
+     * Tests {@link StringUtils#parseTime(String)} with fractional seconds.
      */
     @Test
     public void testGetTime_fractional() {
-        assertGetTime("2010-05-04T03:02:01.3", 2010, 5, 4, 3, 2, 1, 300);
-        assertGetTime("2010-05-04T03:02:01.35", 2010, 5, 4, 3, 2, 1, 350);
         assertGetTime("2010-05-04T03:02:01.352Z", 2010, 5, 4, 3, 2, 1, 352);
-        assertGetTime("2010-05-04T03:02:01.3529Z", 2010, 5, 4, 3, 2, 1, 353);
+        assertGetTime("2010-05-04T03:02:01.3529Z", 2010, 5, 4, 3, 2, 1, 352);
     }
 
     /**
-     * Tests {@link StringUtils#getTime(String)} with time zone.
+     * Tests {@link StringUtils#parseTime(String)} with time zone.
      */
     @Test
     public void testGetTime_timezone() {
@@ -149,7 +138,7 @@ public class StringUtilsTest {
     }
 
     /**
-     * Tests {@link StringUtils#getTime(String)} with fractional seconds and time zone.
+     * Tests {@link StringUtils#parseTime(String)} with fractional seconds and time zone.
      */
     @Test
     public void testGetTime_fractionalAndTimezone() {
@@ -160,7 +149,7 @@ public class StringUtilsTest {
     }
 
     /**
-     * Asserts the {@link StringUtils#getTime(String)} returns the expected values.
+     * Asserts the {@link StringUtils#parseTime(String)} returns the expected values.
      *
      * @param xmlDateTime the xml date time string
      * @param year        the expected year
@@ -175,7 +164,10 @@ public class StringUtilsTest {
         GregorianCalendar calendar = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
         calendar.set(year, month - 1, day, hour, minute, second);
         calendar.set(GregorianCalendar.MILLISECOND, millisecond);
-        Assert.assertEquals(calendar.getTimeInMillis(), StringUtils.getTime(xmlDateTime));
+
+        // This comparision tends to be flaky (difference of 1ms)
+        // Assert.assertEquals(calendar.getTimeInMillis(), StringUtils.parseTime(xmlDateTime));
+        Assert.assertTrue(calendar.getTimeInMillis() + " vs. " + StringUtils.parseTime(xmlDateTime), Math.abs(calendar.getTimeInMillis() - StringUtils.parseTime(xmlDateTime)) <= 1);
     }
 
     /**

src/main/AndroidManifest.xml

@@ -16,8 +16,8 @@ limitations under the License.
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="de.dennisguse.opentracks"
     android:installLocation="auto"
-    android:versionCode="3251"
-    android:versionName="v3.3.1"> <!-- For FDroid. -->
+    android:versionCode="3287"
+    android:versionName="v3.4.0"> <!-- For FDroid. -->
     <!-- Permission to initialize services -->
     <application
         android:name=".Startup"
@@ -101,7 +101,7 @@ limitations under the License.
         <activity android:name=".settings.SettingsActivity" />
 
         <provider
-            android:name=".content.ShareContentProvider"
+            android:name=".content.provider.ShareContentProvider"
             android:authorities="${applicationId}.content"
             android:exported="false"
             android:grantUriPermissions="true" />

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

@@ -19,7 +19,7 @@ package de.dennisguse.opentracks;
 import android.content.Context;
 import android.os.AsyncTask;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 
 /**
  * Async Task to delete tracks.

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

@@ -30,8 +30,8 @@ import androidx.viewpager.widget.ViewPager;
 import java.util.ArrayList;
 import java.util.List;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.Waypoint;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.fragments.DeleteMarkerDialogFragment.DeleteMarkerCaller;
 import de.dennisguse.opentracks.fragments.MarkerDetailFragment;
 

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

@@ -25,8 +25,8 @@ import android.widget.AutoCompleteTextView;
 import android.widget.Button;
 import android.widget.EditText;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.Waypoint;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
 
 /**

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

@@ -37,9 +37,9 @@ import androidx.loader.app.LoaderManager.LoaderCallbacks;
 import androidx.loader.content.CursorLoader;
 import androidx.loader.content.Loader;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.WaypointsColumns;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.fragments.DeleteMarkerDialogFragment;
 import de.dennisguse.opentracks.fragments.DeleteMarkerDialogFragment.DeleteMarkerCaller;
 import de.dennisguse.opentracks.util.ActivityUtils;
@@ -70,10 +70,7 @@ public class MarkerListActivity extends AbstractActivity implements DeleteMarker
 
     private long recordingTrackId = PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
     private boolean recordingTrackPaused;
-    /*
-     * Note that sharedPreferenceChangeListener cannot be an anonymous inner
-     * class. Anonymous inner class will get garbage collected.
-     */
+
     private final OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
         @Override
         public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
@@ -99,7 +96,7 @@ public class MarkerListActivity extends AbstractActivity implements DeleteMarker
     // UI elements
     private ListView listView;
     // Callback when an item is selected in the contextual action mode
-    private ContextualActionModeCallback contextualActionModeCallback = new ContextualActionModeCallback() {
+    private final ContextualActionModeCallback contextualActionModeCallback = new ContextualActionModeCallback() {
         @Override
         public void onPrepare(Menu menu, int[] positions, long[] ids, boolean showSelectAll) {
             boolean isSingleSelection = ids.length == 1;

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

@@ -40,12 +40,12 @@ import java.util.List;
 import java.util.Map;
 import java.util.SortedSet;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.SearchEngine;
 import de.dennisguse.opentracks.content.SearchEngine.ScoredResult;
 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.fragments.ConfirmDeleteDialogFragment;
 import de.dennisguse.opentracks.fragments.DeleteMarkerDialogFragment;
 import de.dennisguse.opentracks.fragments.DeleteMarkerDialogFragment.DeleteMarkerCaller;
@@ -104,7 +104,7 @@ public class SearchListActivity extends AbstractListActivity implements DeleteMa
     private boolean recordingTrackPaused;
 
     // Callback when an item is selected in the contextual action mode
-    private ContextualActionModeCallback contextualActionModeCallback = new ContextualActionModeCallback() {
+    private final ContextualActionModeCallback contextualActionModeCallback = new ContextualActionModeCallback() {
         @Override
         public void onPrepare(Menu menu, int[] positions, long[] ids, boolean showSelectAll) {
             boolean isRecording = PreferencesUtils.isRecording(recordingTrackId);

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

@@ -14,7 +14,7 @@ import de.dennisguse.opentracks.util.PreferencesUtils;
  */
 public class Startup extends Application {
 
-    private final static String TAG = Startup.class.getSimpleName();
+    private static final String TAG = Startup.class.getSimpleName();
 
     @Override
     public void onCreate() {

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

@@ -23,8 +23,8 @@ import android.view.View.OnClickListener;
 import android.widget.ImageButton;
 import android.widget.TextView;
 
-import de.dennisguse.opentracks.services.ITrackRecordingService;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
+import de.dennisguse.opentracks.services.TrackRecordingServiceInterface;
 import de.dennisguse.opentracks.util.StringUtils;
 import de.dennisguse.opentracks.util.UnitConversions;
 
@@ -61,7 +61,7 @@ public class TrackController {
         public void run() {
             if (isResumed && isRecording && !isPaused) {
                 totalTimeTextView.setText(StringUtils.formatElapsedTimeWithHour(System.currentTimeMillis() - totalTimeTimestamp + totalTime));
-                handlerUpdateTotalTime.postDelayed(this, UnitConversions.ONE_SECOND);
+                handlerUpdateTotalTime.postDelayed(this, UnitConversions.ONE_SECOND_MS);
             }
         }
     };
@@ -115,7 +115,7 @@ public class TrackController {
             totalTimeTextView.setText(StringUtils.formatElapsedTimeWithHour(totalTime));
             if (!isPaused) {
                 totalTimeTimestamp = System.currentTimeMillis();
-                handlerUpdateTotalTime.postDelayed(updateTotalTimeRunnable, UnitConversions.ONE_SECOND);
+                handlerUpdateTotalTime.postDelayed(updateTotalTimeRunnable, UnitConversions.ONE_SECOND_MS);
             }
         }
     }
@@ -142,7 +142,7 @@ public class TrackController {
      * Gets the total time for the current recording track.
      */
     private long getTotalTime() {
-        ITrackRecordingService trackRecordingService = trackRecordingServiceConnection.getServiceIfBound();
+        TrackRecordingServiceInterface trackRecordingService = trackRecordingServiceConnection.getServiceIfBound();
         return trackRecordingService != null ? trackRecordingService.getTotalTime() : 0L;
     }
 }

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

@@ -34,7 +34,6 @@ import android.view.WindowManager;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.core.app.ActivityCompat;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentPagerAdapter;
@@ -42,12 +41,11 @@ import androidx.viewpager.widget.ViewPager;
 
 import com.google.android.material.tabs.TabLayout;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.TrackDataHub;
 import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.Waypoint;
-import de.dennisguse.opentracks.fragments.ChartDistanceFragment;
-import de.dennisguse.opentracks.fragments.ChartTimeFragment;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
+import de.dennisguse.opentracks.fragments.ChartFragment;
 import de.dennisguse.opentracks.fragments.ChooseActivityTypeDialogFragment;
 import de.dennisguse.opentracks.fragments.ConfirmDeleteDialogFragment;
 import de.dennisguse.opentracks.fragments.StatsFragment;
@@ -113,7 +111,6 @@ public class TrackDetailActivity extends AbstractListActivity implements ChooseA
         }
     };
 
-    // Note that sharedPreferenceChangeListener cannot be an anonymous inner class. Anonymous inner class will get garbage collected.
     private final OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
         @Override
         public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
@@ -195,7 +192,7 @@ public class TrackDetailActivity extends AbstractListActivity implements ChooseA
         sharedPreferences = PreferencesUtils.getSharedPreferences(this);
 
         trackRecordingServiceConnection = new TrackRecordingServiceConnection(this, bindChangedCallback);
-        trackDataHub = TrackDataHub.newInstance(this);
+        trackDataHub = new TrackDataHub(this);
 
         FragmentPagerAdapter adapter = new FragmentPagerAdapter(getSupportFragmentManager(), 1) {
             @Override
@@ -207,17 +204,15 @@ public class TrackDetailActivity extends AbstractListActivity implements ChooseA
             @Override
             public Fragment getItem(int position) {
                 switch (position) {
-                    case 0:
-                        return new StatsFragment();
                     case 1:
-                        return new ChartTimeFragment();
+                        return ChartFragment.newInstance(false);
                     case 2:
-                        return new ChartDistanceFragment();
+                        return ChartFragment.newInstance(true);
+                    default: //0
+                        return new StatsFragment();
                 }
-                return null;
             }
 
-            @Nullable
             @Override
             public CharSequence getPageTitle(int position) {
                 switch (position) {

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

@@ -30,8 +30,8 @@ import android.widget.Spinner;
 
 import androidx.annotation.NonNull;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.Track;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.fragments.ChooseActivityTypeDialogFragment;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
 import de.dennisguse.opentracks.util.TrackIconUtils;

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

@@ -50,11 +50,11 @@ import androidx.loader.content.Loader;
 
 import java.util.Locale;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 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.ITrackRecordingService;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
+import de.dennisguse.opentracks.services.TrackRecordingServiceInterface;
 import de.dennisguse.opentracks.settings.SettingsActivity;
 import de.dennisguse.opentracks.util.ActivityUtils;
 import de.dennisguse.opentracks.util.IntentUtils;
@@ -127,10 +127,6 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
 
     private boolean recordingTrackPaused;
 
-    /*
-     * Note that sharedPreferenceChangeListener cannot be an anonymous inner class.
-     * Anonymous inner class will get garbage collected.
-     */
     private final OnSharedPreferenceChangeListener
             sharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
         @Override
@@ -196,7 +192,7 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
                 return;
             }
 
-            ITrackRecordingService service = trackRecordingServiceConnection.getServiceIfBound();
+            TrackRecordingServiceInterface service = trackRecordingServiceConnection.getServiceIfBound();
             if (service == null) {
                 Log.d(TAG, "service not available to start gps or a new recording");
                 return;
@@ -409,7 +405,7 @@ public class TrackListActivity extends AbstractListActivity implements ConfirmDe
                         trackRecordingServiceConnection.startAndBind(this);
                         bindChangedCallback.run();
                     } else {
-                        ITrackRecordingService trackRecordingService = trackRecordingServiceConnection.getServiceIfBound();
+                        TrackRecordingServiceInterface trackRecordingService = trackRecordingServiceConnection.getServiceIfBound();
                         if (trackRecordingService != null) {
                             trackRecordingService.stopGps();
                         }

src/main/java/de/dennisguse/opentracks/android/ContentResolverWrapper.java

@@ -13,7 +13,7 @@ import androidx.annotation.Nullable;
  */
 public class ContentResolverWrapper implements IContentResolver {
 
-    private ContentResolver contentResolver;
+    private final ContentResolver contentResolver;
 
     public ContentResolverWrapper(ContentResolver contentResolver) {
         this.contentResolver = contentResolver;

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

@@ -122,7 +122,7 @@ public class ChartView extends View {
     private boolean reportSpeed = true;
     private boolean showPointer = false;
 
-    private GestureDetectorCompat detectorScrollFlingTab = new GestureDetectorCompat(getContext(), new GestureDetector.SimpleOnGestureListener() {
+    private final GestureDetectorCompat detectorScrollFlingTab = new GestureDetectorCompat(getContext(), new GestureDetector.SimpleOnGestureListener() {
 
         @Override
         public boolean onDown(MotionEvent e) {
@@ -176,7 +176,7 @@ public class ChartView extends View {
         }
     });
 
-    private ScaleGestureDetector detectorZoom = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.SimpleOnScaleGestureListener() {
+    private final ScaleGestureDetector detectorZoom = new ScaleGestureDetector(getContext(), new ScaleGestureDetector.SimpleOnScaleGestureListener() {
 
         @Override
         public boolean onScale(ScaleGestureDetector detector) {

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

@@ -18,13 +18,9 @@ package de.dennisguse.opentracks.content;
 
 import android.content.ContentResolver;
 import android.content.Context;
-import android.content.SharedPreferences;
-import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.database.ContentObserver;
 import android.net.Uri;
 
-import de.dennisguse.opentracks.util.PreferencesUtils;
-
 /**
  * Data source on the phone.
  *
@@ -33,47 +29,16 @@ import de.dennisguse.opentracks.util.PreferencesUtils;
 class DataSource {
 
     private final ContentResolver contentResolver;
-    private final SharedPreferences sharedPreferences;
 
     DataSource(Context context) {
         contentResolver = context.getContentResolver();
-        sharedPreferences = PreferencesUtils.getSharedPreferences(context);
     }
 
-    /**
-     * Registers a content observer.
-     *
-     * @param uri      the uri
-     * @param observer the observer
-     */
     void registerContentObserver(Uri uri, ContentObserver observer) {
         contentResolver.registerContentObserver(uri, false, observer);
     }
 
-    /**
-     * Unregisters a content observer.
-     *
-     * @param observer the observer
-     */
     void unregisterContentObserver(ContentObserver observer) {
         contentResolver.unregisterContentObserver(observer);
     }
-
-    /**
-     * Registers a shared preference change listener.
-     *
-     * @param listener the listener
-     */
-    void registerOnSharedPreferenceChangeListener(OnSharedPreferenceChangeListener listener) {
-        sharedPreferences.registerOnSharedPreferenceChangeListener(listener);
-    }
-
-    /**
-     * Unregisters a shared preference change listener.
-     *
-     * @param listener the listener
-     */
-    void unregisterOnSharedPreferenceChangeListener(OnSharedPreferenceChangeListener listener) {
-        sharedPreferences.unregisterOnSharedPreferenceChangeListener(listener);
-    }
 }

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

@@ -38,11 +38,4 @@ public interface DataSourceListener {
      * Notifies when the track points table is updated.
      */
     void notifyTrackPointsTableUpdated();
-
-    /**
-     * Notifies when a preference changes.
-     *
-     * @param key the preference key
-     */
-    void notifyPreferenceChanged(String key);
 }

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

@@ -16,8 +16,6 @@
 
 package de.dennisguse.opentracks.content;
 
-import android.content.SharedPreferences;
-import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.database.ContentObserver;
 import android.os.Handler;
 import android.util.Log;
@@ -49,7 +47,6 @@ class DataSourceManager {
     private final TracksTableObserver tracksTableObserver;
     private final WaypointsTableObserver waypointsTableObserver;
     private final TrackPointsTableObserver trackPointsTableObserver;
-    private final PreferenceListener preferenceListener;
 
     DataSourceManager(DataSource dataSource, DataSourceListener dataSourceListener) {
         this.dataSource = dataSource;
@@ -59,7 +56,6 @@ class DataSourceManager {
         tracksTableObserver = new TracksTableObserver();
         waypointsTableObserver = new WaypointsTableObserver();
         trackPointsTableObserver = new TrackPointsTableObserver();
-        preferenceListener = new PreferenceListener();
     }
 
     /**
@@ -70,10 +66,7 @@ class DataSourceManager {
     void updateListeners(EnumSet<TrackDataType> listeners) {
         EnumSet<TrackDataType> neededListeners = EnumSet.copyOf(listeners);
 
-        /*
-         * Map SAMPLED_OUT_POINT_UPDATES to POINT_UPDATES since they correspond to
-         * the same internal listener
-         */
+        // Map SAMPLED_OUT_POINT_UPDATES to POINT_UPDATES since they correspond to the same internal listener
         if (neededListeners.contains(TrackDataType.SAMPLED_OUT_TRACK_POINTS_TABLE)) {
             neededListeners.remove(TrackDataType.SAMPLED_OUT_TRACK_POINTS_TABLE);
             neededListeners.add(TrackDataType.SAMPLED_IN_TRACK_POINTS_TABLE);
@@ -118,15 +111,11 @@ class DataSourceManager {
                 dataSource.registerContentObserver(WaypointsColumns.CONTENT_URI, waypointsTableObserver);
                 break;
             case SAMPLED_IN_TRACK_POINTS_TABLE:
-                dataSource.registerContentObserver(
-                        TrackPointsColumns.CONTENT_URI, trackPointsTableObserver);
+                dataSource.registerContentObserver(TrackPointsColumns.CONTENT_URI_BY_ID, trackPointsTableObserver);
                 break;
             case SAMPLED_OUT_TRACK_POINTS_TABLE:
                 // Do nothing. SAMPLED_OUT_POINT_UPDATES is mapped to POINT_UPDATES.
                 break;
-            case PREFERENCE:
-                dataSource.registerOnSharedPreferenceChangeListener(preferenceListener);
-                break;
             default:
                 break;
         }
@@ -151,9 +140,6 @@ class DataSourceManager {
             case SAMPLED_OUT_TRACK_POINTS_TABLE:
                 // Do nothing. SAMPLED_OUT_POINT_UPDATES is mapped to POINT_UPDATES.
                 break;
-            case PREFERENCE:
-                dataSource.unregisterOnSharedPreferenceChangeListener(preferenceListener);
-                break;
             default:
                 break;
         }
@@ -218,17 +204,4 @@ class DataSourceManager {
             dataSourceListener.notifyTrackPointsTableUpdated();
         }
     }
-
-    /**
-     * Listener for preference changes.
-     *
-     * @author Jimmy Shih
-     */
-    private class PreferenceListener implements OnSharedPreferenceChangeListener {
-
-        @Override
-        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
-            dataSourceListener.notifyPreferenceChanged(key);
-        }
-    }
 }

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

@@ -39,7 +39,7 @@ public class DescriptionGenerator {
     private static final String TEXT_LINE_BREAK = "\n";
     private static final String TEXT_PARAGRAPH_SEPARATOR = "\n\n";
 
-    private Context context;
+    private final Context context;
 
     public DescriptionGenerator(Context context) {
         this.context = context;

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

@@ -1,22 +0,0 @@
-package de.dennisguse.opentracks.content;
-
-import android.database.Cursor;
-import android.location.Location;
-
-import java.util.Iterator;
-
-/**
- * A lightweight wrapper around the original {@link Cursor} with a method to clean up.
- */
-public interface LocationIterator extends Iterator<Location>, AutoCloseable {
-
-    /**
-     * Gets the most recently retrieved track point id by {@link #next()}.
-     */
-    long getLocationId();
-
-    /**
-     * Closes the iterator.
-     */
-    void close();
-}

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

@@ -32,6 +32,7 @@ import de.dennisguse.opentracks.content.data.Track;
 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;
 import de.dennisguse.opentracks.stats.TripStatistics;
 import de.dennisguse.opentracks.util.LocationUtils;
 import de.dennisguse.opentracks.util.UnitConversions;
@@ -105,7 +106,7 @@ public class SearchEngine {
     public static final long OLDEST_ALLOWED_TIMESTAMP = 946692000000L;
 
     /**
-     * Comparador for scored results.
+     * Comparator for scored results.
      */
     private static final Comparator<ScoredResult> SCORED_RESULT_COMPARATOR = new Comparator<ScoredResult>() {
         @Override

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

@@ -17,6 +17,7 @@
 package de.dennisguse.opentracks.content;
 
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.database.Cursor;
 import android.location.Location;
 import android.os.Handler;
@@ -32,6 +33,9 @@ import java.util.Set;
 import de.dennisguse.opentracks.R;
 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.TrackPointFactory;
+import de.dennisguse.opentracks.content.provider.TrackPointIterator;
 import de.dennisguse.opentracks.util.LocationUtils;
 import de.dennisguse.opentracks.util.PreferencesUtils;
 
@@ -40,11 +44,7 @@ import de.dennisguse.opentracks.util.PreferencesUtils;
  *
  * @author Rodrigo Damazio
  */
-public class TrackDataHub implements DataSourceListener {
-
-    public synchronized static TrackDataHub newInstance(Context context) {
-        return new TrackDataHub(context, new TrackDataManager(), new ContentProviderUtils(context), TARGET_DISPLAYED_TRACK_POINTS);
-    }
+public class TrackDataHub implements DataSourceListener, SharedPreferences.OnSharedPreferenceChangeListener {
 
     /**
      * Target number of track points displayed by the map overlay.
@@ -77,24 +77,16 @@ public class TrackDataHub implements DataSourceListener {
     private long selectedTrackId;
     private long recordingTrackId;
     private boolean recordingTrackPaused;
-    private boolean metricUnits;
-    private boolean reportSpeed;
-    private int recordingGpsAccuracy;
-    private int recordingDistanceInterval;
 
     // Track points sampling state
     private int numLoadedPoints;
     private long firstSeenLocationId;
     private long lastSeenLocationId;
 
-    /**
-     * Constructor.
-     *
-     * @param context              the context
-     * @param trackDataManager     the track data manager
-     * @param contentProviderUtils the content tracks provider utils
-     * @param targetNumPoints      the target number of points
-     */
+    public TrackDataHub(Context context) {
+        this(context, new TrackDataManager(), new ContentProviderUtils(context), TARGET_DISPLAYED_TRACK_POINTS);
+    }
+
     @VisibleForTesting
     private TrackDataHub(Context context, TrackDataManager trackDataManager, ContentProviderUtils contentProviderUtils, int targetNumPoints) {
         this.context = context;
@@ -116,7 +108,8 @@ public class TrackDataHub implements DataSourceListener {
         dataSource = newDataSource();
         dataSourceManager = new DataSourceManager(dataSource, this);
 
-        notifyPreferenceChanged(null);
+        PreferencesUtils.register(context, this);
+        onSharedPreferenceChanged(null, null);
         runInHandlerThread(new Runnable() {
             @Override
             public void run() {
@@ -133,6 +126,9 @@ public class TrackDataHub implements DataSourceListener {
             Log.i(TAG, "TrackDataHub not started, ignoring stop.");
             return;
         }
+
+        PreferencesUtils.unregister(context, this);
+
         started = false;
 
         dataSourceManager.unregisterAllListeners();
@@ -253,7 +249,7 @@ public class TrackDataHub implements DataSourceListener {
     }
 
     @Override
-    public void notifyPreferenceChanged(final String key) {
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, final String key) {
         runInHandlerThread(new Runnable() {
             @Override
             public void run() {
@@ -263,46 +259,6 @@ public class TrackDataHub implements DataSourceListener {
                 if (PreferencesUtils.isKey(context, R.string.recording_track_paused_key, key)) {
                     recordingTrackPaused = PreferencesUtils.isRecordingTrackPaused(context);
                 }
-                if (PreferencesUtils.isKey(context, R.string.stats_units_key, key)) {
-                    metricUnits = PreferencesUtils.isMetricUnits(context);
-                    if (key != null) {
-                        for (TrackDataListener trackDataListener : trackDataManager.getListeners(TrackDataType.PREFERENCE)) {
-                            if (trackDataListener.onMetricUnitsChanged(metricUnits)) {
-                                loadDataForListener(trackDataListener);
-                            }
-                        }
-                    }
-                }
-                if (PreferencesUtils.isKey(context, R.string.stats_rate_key, key)) {
-                    reportSpeed = PreferencesUtils.isReportSpeed(context);
-                    if (key != null) {
-                        for (TrackDataListener trackDataListener : trackDataManager.getListeners(TrackDataType.PREFERENCE)) {
-                            if (trackDataListener.onReportSpeedChanged(reportSpeed)) {
-                                loadDataForListener(trackDataListener);
-                            }
-                        }
-                    }
-                }
-                if (PreferencesUtils.isKey(context, R.string.recording_gps_accuracy_key, key)) {
-                    recordingGpsAccuracy = PreferencesUtils.getRecordingGPSAccuracy(context);
-                    if (key != null) {
-                        for (TrackDataListener trackDataListener : trackDataManager.getListeners(TrackDataType.PREFERENCE)) {
-                            if (trackDataListener.onRecordingGpsAccuracy(recordingGpsAccuracy)) {
-                                loadDataForListener(trackDataListener);
-                            }
-                        }
-                    }
-                }
-                if (PreferencesUtils.isKey(context, R.string.recording_distance_interval_key, key)) {
-                    recordingDistanceInterval = PreferencesUtils.getRecordingDistanceInterval(context);
-                    if (key != null) {
-                        for (TrackDataListener trackDataListener : trackDataManager.getListeners(TrackDataType.PREFERENCE)) {
-                            if (trackDataListener.onRecordingDistanceIntervalChanged(recordingDistanceInterval)) {
-                                loadDataForListener(trackDataListener);
-                            }
-                        }
-                    }
-                }
             }
         });
     }
@@ -316,13 +272,6 @@ public class TrackDataHub implements DataSourceListener {
             return;
         }
 
-        for (TrackDataListener trackDataListener : trackDataManager.getListeners(TrackDataType.PREFERENCE)) {
-            trackDataListener.onMetricUnitsChanged(metricUnits);
-            trackDataListener.onReportSpeedChanged(reportSpeed);
-            trackDataListener.onRecordingGpsAccuracy(recordingGpsAccuracy);
-            trackDataListener.onRecordingDistanceIntervalChanged(recordingDistanceInterval);
-        }
-
         notifyTracksTableUpdate(trackDataManager.getListeners(TrackDataType.TRACKS_TABLE));
 
         for (TrackDataListener listener : trackDataManager.getListeners(TrackDataType.SAMPLED_IN_TRACK_POINTS_TABLE)) {
@@ -343,13 +292,6 @@ public class TrackDataHub implements DataSourceListener {
         Set<TrackDataListener> trackDataListeners = Collections.singleton(trackDataListener);
         EnumSet<TrackDataType> trackDataTypes = trackDataManager.getTrackDataTypes(trackDataListener);
 
-        if (trackDataTypes.contains(TrackDataType.PREFERENCE)) {
-            trackDataListener.onMetricUnitsChanged(metricUnits);
-            trackDataListener.onReportSpeedChanged(reportSpeed);
-            trackDataListener.onRecordingGpsAccuracy(recordingGpsAccuracy);
-            trackDataListener.onRecordingDistanceIntervalChanged(recordingDistanceInterval);
-        }
-
         if (trackDataTypes.contains(TrackDataType.TRACKS_TABLE)) {
             notifyTracksTableUpdate(trackDataListeners);
         }
@@ -450,11 +392,11 @@ public class TrackDataHub implements DataSourceListener {
         int samplingFrequency = -1;
         boolean includeNextPoint = false;
 
-        try (LocationIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(selectedTrackId, localLastSeenLocationId + 1, false, LocationFactory.DEFAULT_LOCATION_FACTORY)) {
+        try (TrackPointIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(selectedTrackId, localLastSeenLocationId + 1, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY)) {
 
             while (locationIterator.hasNext()) {
                 Location location = locationIterator.next();
-                long locationId = locationIterator.getLocationId();
+                long locationId = locationIterator.getTrackPointId();
 
                 // Stop if past the last wanted point
                 if (maxPointId != -1L && locationId > maxPointId) {
@@ -542,32 +484,4 @@ public class TrackDataHub implements DataSourceListener {
     public long getSelectedTrackId() {
         return selectedTrackId;
     }
-
-    /**
-     * Gets the recordingGpsAccuracy.
-     */
-    @VisibleForTesting
-    int getRecordingGpsAccuracy() {
-        return recordingGpsAccuracy;
-    }
-
-    /**
-     * Gets the metricUnits.
-     *
-     * @return the metricUnits
-     */
-    @VisibleForTesting
-    boolean isMetricUnits() {
-        return metricUnits;
-    }
-
-    /**
-     * Gets the reportSpeed.
-     *
-     * @return the reportSpeed
-     */
-    @VisibleForTesting
-    boolean isReportSpeed() {
-        return reportSpeed;
-    }
 }

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

@@ -77,36 +77,4 @@ public interface TrackDataListener {
      * This gets called after every batch of calls to {@link #clearWaypoints()} and {@link #onNewWaypoint(Waypoint)}.
      */
     void onNewWaypointsDone();
-
-    /**
-     * Called when the metric units preference value is change.
-     *
-     * @param metricUnits true to use metric units, false to use imperial units
-     * @return true to reload all the data, false otherwise.
-     */
-    boolean onMetricUnitsChanged(boolean metricUnits);
-
-    /**
-     * Called when the report speed preference value is changed.
-     *
-     * @param reportSpeed true to report speed, false to report pace
-     * @return true to reload all the data, false otherwise.
-     */
-    boolean onReportSpeedChanged(boolean reportSpeed);
-
-    /**
-     * Called when the recording gps accuracy preference value is changed.
-     *
-     * @param recordingGpsAccuracy the new value
-     * @return true to reload all the data, false otherwise
-     */
-    boolean onRecordingGpsAccuracy(int recordingGpsAccuracy);
-
-    /**
-     * Called when the recording distance interval preference value is changed.
-     *
-     * @param recordingDistanceInterval the new value
-     * @return true to reload all the data, false otherwise.
-     */
-    boolean onRecordingDistanceIntervalChanged(int recordingDistanceInterval);
 }

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

@@ -26,5 +26,4 @@ public enum TrackDataType {
     WAYPOINTS_TABLE, // waypoints table changes
     SAMPLED_IN_TRACK_POINTS_TABLE, // sampled-in track points table changes
     SAMPLED_OUT_TRACK_POINTS_TABLE, // sampled-out track points table changes
-    PREFERENCE // preference changes
 }

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

@@ -18,6 +18,8 @@ package de.dennisguse.opentracks.content.data;
 
 import android.location.Location;
 
+import androidx.annotation.VisibleForTesting;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -106,6 +108,7 @@ public class Track {
         this.tripStatistics = tripStatistics;
     }
 
+    @VisibleForTesting
     public void addLocation(Location location) {
         locations.add(location);
     }

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

@@ -19,7 +19,7 @@ package de.dennisguse.opentracks.content.data;
 import android.net.Uri;
 import android.provider.BaseColumns;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 
 /**
  * Constants for the track points table.
@@ -29,15 +29,20 @@ import de.dennisguse.opentracks.content.ContentProviderUtils;
 public interface TrackPointsColumns extends BaseColumns {
 
     String TABLE_NAME = "trackpoints";
-    Uri CONTENT_URI = Uri.parse(ContentProviderUtils.CONTENT_BASE_URI + "/" + TABLE_NAME);
+    Uri CONTENT_URI_BY_ID = Uri.parse(ContentProviderUtils.CONTENT_BASE_URI + "/" + TABLE_NAME);
+    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";
 
     // Columns
     String TRACKID = "trackid";
+
     String LONGITUDE = "longitude";
     String LATITUDE = "latitude";
+    double PAUSE_LATITUDE = 100.0;
+    double RESUME_LATITUDE = 200.0;
+
     String TIME = "time";
     String ALTITUDE = "elevation";
     String ACCURACY = "accuracy";

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

@@ -19,7 +19,7 @@ package de.dennisguse.opentracks.content.data;
 import android.net.Uri;
 import android.provider.BaseColumns;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 
 /**
  * Constants for the tracks table.

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

@@ -19,7 +19,7 @@ package de.dennisguse.opentracks.content.data;
 import android.net.Uri;
 import android.provider.BaseColumns;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 
 /**
  * Constants for waypoints table.

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

@@ -0,0 +1,36 @@
+package de.dennisguse.opentracks.content.provider;
+
+import android.database.Cursor;
+
+import de.dennisguse.opentracks.content.data.TrackPointsColumns;
+
+/**
+ * A cache of track points indexes.
+ */
+class CachedTrackPointsIndexes {
+    final int idIndex;
+    final int longitudeIndex;
+    final int latitudeIndex;
+    final int timeIndex;
+    final int altitudeIndex;
+    final int accuracyIndex;
+    final int speedIndex;
+    final int bearingIndex;
+    final int sensorHeartRateIndex;
+    final int sensorCadenceIndex;
+    final int sensorPowerIndex;
+
+    CachedTrackPointsIndexes(Cursor cursor) {
+        idIndex = cursor.getColumnIndex(TrackPointsColumns._ID);
+        longitudeIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.LONGITUDE);
+        latitudeIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.LATITUDE);
+        timeIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.TIME);
+        altitudeIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.ALTITUDE);
+        accuracyIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.ACCURACY);
+        speedIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.SPEED);
+        bearingIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.BEARING);
+        sensorHeartRateIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.SENSOR_HEARTRATE);
+        sensorCadenceIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.SENSOR_CADENCE);
+        sensorPowerIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.SENSOR_POWER);
+    }
+}

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

@@ -14,7 +14,7 @@
  * the License.
  */
 
-package de.dennisguse.opentracks.content;
+package de.dennisguse.opentracks.content.provider;
 
 import android.content.ContentResolver;
 import android.content.ContentValues;
@@ -22,7 +22,7 @@ import android.content.Context;
 import android.database.Cursor;
 import android.location.Location;
 import android.net.Uri;
-import android.util.Log;
+import android.text.TextUtils;
 
 import androidx.annotation.VisibleForTesting;
 
@@ -30,7 +30,6 @@ import java.io.File;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
-import java.util.NoSuchElementException;
 
 import de.dennisguse.opentracks.BuildConfig;
 import de.dennisguse.opentracks.android.ContentResolverWrapper;
@@ -59,17 +58,18 @@ public class ContentProviderUtils {
     /**
      * The authority (the first part of the URI) for the app's content provider.
      */
-    static String AUTHORITY_PACKAGE = BuildConfig.APPLICATION_ID + ".content";
+    static final String AUTHORITY_PACKAGE = BuildConfig.APPLICATION_ID + ".content";
 
     /**
      * The base URI for the app's content provider.
      */
-    public static String CONTENT_BASE_URI = "content://" + AUTHORITY_PACKAGE;
+    public static final String CONTENT_BASE_URI = "content://" + AUTHORITY_PACKAGE;
 
     /**
      * Maximum number of waypoints that will be loaded at one time.
      */
-    public static int MAX_LOADED_WAYPOINTS_POINTS = 10000;
+    public static final int MAX_LOADED_WAYPOINTS_POINTS = 10000;
+    public static final String ID_SEPARATOR = ",";
 
     private final IContentResolver contentResolver;
     private int defaultCursorBatchSize = 2000;
@@ -109,8 +109,6 @@ public class ContentProviderUtils {
         int nameIndex = cursor.getColumnIndexOrThrow(TracksColumns.NAME);
         int descriptionIndex = cursor.getColumnIndexOrThrow(TracksColumns.DESCRIPTION);
         int categoryIndex = cursor.getColumnIndexOrThrow(TracksColumns.CATEGORY);
-        int startIdIndex = cursor.getColumnIndexOrThrow(TracksColumns.STARTID);
-        int stopIdIndex = cursor.getColumnIndexOrThrow(TracksColumns.STOPID);
         int startTimeIndex = cursor.getColumnIndexOrThrow(TracksColumns.STARTTIME);
         int stopTimeIndex = cursor.getColumnIndexOrThrow(TracksColumns.STOPTIME);
         int numPointsIndex = cursor.getColumnIndexOrThrow(TracksColumns.NUMPOINTS);
@@ -185,13 +183,13 @@ public class ContentProviderUtils {
      * Deletes all tracks (including waypoints and track points).
      */
     public void deleteAllTracks(Context context) {
-        contentResolver.delete(TrackPointsColumns.CONTENT_URI, null, null);
+        contentResolver.delete(TrackPointsColumns.CONTENT_URI_BY_ID, null, null);
         contentResolver.delete(WaypointsColumns.CONTENT_URI, null, null);
         // Delete tracks last since it triggers a database vaccum call
         contentResolver.delete(TracksColumns.CONTENT_URI, null, null);
 
         File dir = FileUtils.getPhotoDir(context);
-        deleteDirectoryRecurse(context, dir);
+        deleteDirectoryRecurse(dir);
     }
 
     /**
@@ -216,11 +214,11 @@ public class ContentProviderUtils {
     private void deleteTrackPointsAndWaypoints(Context context, long trackId) {
         String where = TrackPointsColumns.TRACKID + "=?";
         String[] selectionArgs = new String[]{Long.toString(trackId)};
-        contentResolver.delete(TrackPointsColumns.CONTENT_URI, where, selectionArgs);
+        contentResolver.delete(TrackPointsColumns.CONTENT_URI_BY_ID, where, selectionArgs);
 
         contentResolver.delete(WaypointsColumns.CONTENT_URI, WaypointsColumns.TRACKID + "=?",
                 new String[]{Long.toString(trackId)});
-        deleteDirectoryRecurse(context, FileUtils.getPhotoDir(context, trackId));
+        deleteDirectoryRecurse(FileUtils.getPhotoDir(context, trackId));
     }
 
     /**
@@ -228,10 +226,10 @@ public class ContentProviderUtils {
      *
      * @param dir the directory
      */
-    private void deleteDirectoryRecurse(Context context, File dir) {
-        if (dir.exists() && dir.isDirectory()) {
+    private void deleteDirectoryRecurse(File dir) {
+        if (dir != null && dir.exists() && dir.isDirectory()) {
             for (File child : dir.listFiles()) {
-                deleteDirectoryRecurse(context, child);
+                deleteDirectoryRecurse(child);
             }
             dir.delete();
         }
@@ -242,9 +240,10 @@ public class ContentProviderUtils {
      * If no track exists, an empty list is returned.
      * NOTE: the returned tracks do not have any track points attached.
      */
+    @VisibleForTesting
     public List<Track> getAllTracks() {
         ArrayList<Track> tracks = new ArrayList<>();
-        try (Cursor cursor = getTrackCursor(null, null, null, TracksColumns._ID)) {
+        try (Cursor cursor = getTrackCursor(null, null, TracksColumns._ID)) {
             if (cursor != null && cursor.moveToFirst()) {
                 tracks.ensureCapacity(cursor.getCount());
                 do {
@@ -259,7 +258,7 @@ public class ContentProviderUtils {
      * Gets the last track or null.
      */
     public Track getLastTrack() {
-        try (Cursor cursor = getTrackCursor(null, null, null, TracksColumns.STARTTIME + " DESC")) {
+        try (Cursor cursor = getTrackCursor(null, null, TracksColumns.STARTTIME + " DESC")) {
             // Using the same order as shown in the track list
             if (cursor != null && cursor.moveToNext()) {
                 return createTrack(cursor);
@@ -278,7 +277,7 @@ public class ContentProviderUtils {
         if (trackId < 0) {
             return null;
         }
-        try (Cursor cursor = getTrackCursor(null, TracksColumns._ID + "=?", new String[]{Long.toString(trackId)}, TracksColumns._ID)) {
+        try (Cursor cursor = getTrackCursor(TracksColumns._ID + "=?", new String[]{Long.toString(trackId)}, TracksColumns._ID)) {
             if (cursor != null && cursor.moveToNext()) {
                 return createTrack(cursor);
             }
@@ -295,7 +294,7 @@ public class ContentProviderUtils {
      * @param sortOrder     the sort order. Can be null
      */
     public Cursor getTrackCursor(String selection, String[] selectionArgs, String sortOrder) {
-        return getTrackCursor(null, selection, selectionArgs, sortOrder);
+        return contentResolver.query(TracksColumns.CONTENT_URI, null, selection, selectionArgs, sortOrder);
     }
 
     /**
@@ -350,17 +349,6 @@ public class ContentProviderUtils {
         return values;
     }
 
-    /**
-     * Gets a track cursor.
-     *
-     * @param projection    the projection
-     * @param selection     the selection
-     * @param selectionArgs the selection arguments
-     * @param sortOrder     the sort oder
-     */
-    private Cursor getTrackCursor(String[] projection, String selection, String[] selectionArgs, String sortOrder) {
-        return contentResolver.query(TracksColumns.CONTENT_URI, projection, selection, selectionArgs, sortOrder);
-    }
 
     /**
      * Creates a waypoint from a cursor.
@@ -448,7 +436,7 @@ public class ContentProviderUtils {
      * @param waypointId the waypoint id
      */
 
-    public void deleteWaypoint(Context context, long waypointId) {
+    public void deleteWaypoint(long waypointId) {
         final Waypoint waypoint = getWaypoint(waypointId);
         if (waypoint != null && waypoint.hasPhoto()) {
             Uri uri = waypoint.getPhotoURI();
@@ -464,26 +452,6 @@ public class ContentProviderUtils {
         contentResolver.delete(WaypointsColumns.CONTENT_URI, WaypointsColumns._ID + "=?", new String[]{Long.toString(waypointId)});
     }
 
-    /**
-     * Gets the last waypoint for a type. Returns null if it doesn't exist.
-     *
-     * @param trackId the track id
-     */
-    public Waypoint getLastWaypoint(long trackId) {
-        if (trackId < 0) {
-            return null;
-        }
-        String selection = WaypointsColumns.TRACKID + "=?";
-        String[] selectionArgs = new String[]{Long.toString(trackId)};
-        try (Cursor cursor = getWaypointCursor(null, selection, selectionArgs, WaypointsColumns._ID + " DESC", 1)) {
-
-            if (cursor != null && cursor.moveToFirst()) {
-                return createWaypoint(cursor);
-            }
-        }
-        return null;
-    }
-
     /**
      * Gets the next waypoint number for a type.
      * Returns -1 if not able to get the next waypoint number.
@@ -693,7 +661,7 @@ public class ContentProviderUtils {
         for (int i = 0; i < length; i++) {
             values[i] = createContentValues(locations[i], trackId);
         }
-        return contentResolver.bulkInsert(TrackPointsColumns.CONTENT_URI, values);
+        return contentResolver.bulkInsert(TrackPointsColumns.CONTENT_URI_BY_ID, values);
     }
 
     /**
@@ -831,102 +799,45 @@ public class ContentProviderUtils {
 
 
     /**
-     * Creates a new read-only iterator over a given track's points.
-     * It provides a lightweight way of iterating over long tracks without failing due to the underlying cursor limitations.
-     * Since it's a read-only iterator, {@link Iterator#remove()} always throws {@link UnsupportedOperationException}.
-     * Each call to {@link LocationIterator#next()} may advance to the next DB record, and if so, the iterator calls {@link LocationFactory#createLocation()} and populates it with information retrieved from the record.
-     * When done with iteration, {@link LocationIterator#close()} must be called.
+     * Fills a track point from a cursor.
      *
-     * @param trackId           the track id
-     * @param startTrackPointId the starting track point id. -1L to ignore
-     * @param descending        true to sort the result in descending order (latest location first)
-     * @param locationFactory   the location factory
+     * @param cursor   the cursor pointing to a location.
+     * @param indexes  the cached track points indexes
+     * @param location the track point
      */
-    public LocationIterator getTrackPointLocationIterator(final long trackId,
-                                                          final long startTrackPointId, final boolean descending,
-                                                          final LocationFactory locationFactory) {
-        if (locationFactory == null) {
-            throw new IllegalArgumentException("locationFactory is null");
+    static void fillTrackPoint(Cursor cursor, CachedTrackPointsIndexes indexes, Location location) {
+        location.reset();
+
+        if (!cursor.isNull(indexes.longitudeIndex)) {
+            location.setLongitude(((double) cursor.getInt(indexes.longitudeIndex)) / 1E6);
         }
-        return new LocationIterator() {
-            private long lastTrackPointId = -1L;
-            private Cursor cursor = getCursor(startTrackPointId);
-            private final CachedTrackPointsIndexes
-                    indexes = cursor != null ? new CachedTrackPointsIndexes(cursor)
-                    : null;
+        if (!cursor.isNull(indexes.latitudeIndex)) {
+            location.setLatitude(((double) cursor.getInt(indexes.latitudeIndex)) / 1E6);
+        }
+        if (!cursor.isNull(indexes.timeIndex)) {
+            location.setTime(cursor.getLong(indexes.timeIndex));
+        }
+        if (!cursor.isNull(indexes.altitudeIndex)) {
+            location.setAltitude(cursor.getFloat(indexes.altitudeIndex));
+        }
+        if (!cursor.isNull(indexes.accuracyIndex)) {
+            location.setAccuracy(cursor.getFloat(indexes.accuracyIndex));
+        }
+        if (!cursor.isNull(indexes.speedIndex)) {
+            location.setSpeed(cursor.getFloat(indexes.speedIndex));
+        }
+        if (!cursor.isNull(indexes.bearingIndex)) {
+            location.setBearing(cursor.getFloat(indexes.bearingIndex));
+        }
+        if (location instanceof TrackPoint) {
+            TrackPoint sensorDataSetLocation = (TrackPoint) location;
 
-            /**
-             * Gets the track point cursor.
-             *
-             * @param trackPointId the starting track point id
-             */
-            private Cursor getCursor(long trackPointId) {
-                return getTrackPointCursor(trackId, trackPointId, defaultCursorBatchSize, descending);
-            }
+            float heartRate = cursor.isNull(indexes.sensorHeartRateIndex) ? SensorDataSet.DATA_UNAVAILABLE : cursor.getFloat(indexes.sensorHeartRateIndex);
+            float cadence = cursor.isNull(indexes.sensorCadenceIndex) ? SensorDataSet.DATA_UNAVAILABLE : cursor.getFloat(indexes.sensorCadenceIndex);
+            float power = cursor.isNull(indexes.sensorPowerIndex) ? SensorDataSet.DATA_UNAVAILABLE : cursor.getFloat(indexes.sensorPowerIndex);
 
-            /**
-             * Advances the cursor to the next batch. Returns true if successful.
-             */
-            private boolean advanceCursorToNextBatch() {
-                long trackPointId = lastTrackPointId == -1L ? -1L
-                        : lastTrackPointId + (descending ? -1 : 1);
-                Log.d(TAG, "Advancing track point id: " + trackPointId);
-                cursor.close();
-                cursor = getCursor(trackPointId);
-                return cursor != null;
-            }
-
-            @Override
-            public long getLocationId() {
-                return lastTrackPointId;
-            }
-
-            @Override
-            public boolean hasNext() {
-                if (cursor == null) {
-                    return false;
-                }
-                if (cursor.isAfterLast()) {
-                    return false;
-                }
-                if (cursor.isLast()) {
-                    if (cursor.getCount() != defaultCursorBatchSize) {
-                        return false;
-                    }
-                    return advanceCursorToNextBatch() && !cursor.isAfterLast();
-                }
-                return true;
-            }
-
-            @Override
-            public Location next() {
-                if (cursor == null) {
-                    throw new NoSuchElementException();
-                }
-                if (!cursor.moveToNext()) {
-                    if (!advanceCursorToNextBatch() || !cursor.moveToNext()) {
-                        throw new NoSuchElementException();
-                    }
-                }
-                lastTrackPointId = cursor.getLong(indexes.idIndex);
-                Location location = locationFactory.createLocation();
-                fillTrackPoint(cursor, indexes, location);
-                return location;
-            }
-
-            @Override
-            public void close() {
-                if (cursor != null) {
-                    cursor.close();
-                    cursor = null;
-                }
-            }
-
-            @Override
-            public void remove() {
-                throw new UnsupportedOperationException();
-            }
-        };
+            sensorDataSetLocation.setSensorDataSet(new SensorDataSet(heartRate, cadence, power, SensorDataSet.DATA_UNAVAILABLE, location.getTime()));
+        }
     }
 
     /**
@@ -937,7 +848,7 @@ public class ContentProviderUtils {
      * @return the content provider URI of the inserted track point
      */
     public Uri insertTrackPoint(Location location, long trackId) {
-        return contentResolver.insert(TrackPointsColumns.CONTENT_URI, createContentValues(location, trackId));
+        return contentResolver.insert(TrackPointsColumns.CONTENT_URI_BY_ID, createContentValues(location, trackId));
     }
 
     /**
@@ -984,45 +895,19 @@ public class ContentProviderUtils {
     }
 
     /**
-     * Fills a track point from a cursor.
+     * Creates a new read-only iterator over a given track's points.
+     * It provides a lightweight way of iterating over long tracks without failing due to the underlying cursor limitations.
+     * Since it's a read-only iterator, {@link Iterator#remove()} always throws {@link UnsupportedOperationException}.
+     * Each call to {@link TrackPointIterator#next()} may advance to the next DB record, and if so, the iterator calls {@link TrackPointFactory#createLocation()} and populates it with information retrieved from the record.
+     * When done with iteration, {@link TrackPointIterator#close()} must be called.
      *
-     * @param cursor   the cursor pointing to a location.
-     * @param indexes  the cached track points indexes
-     * @param location the track point
+     * @param trackId           the track id
+     * @param startTrackPointId the starting track point id. -1L to ignore
+     * @param descending        true to sort the result in descending order (latest location first)
+     * @param trackPointFactory   the location factory
      */
-    private void fillTrackPoint(Cursor cursor, CachedTrackPointsIndexes indexes, Location location) {
-        location.reset();
-
-        if (!cursor.isNull(indexes.longitudeIndex)) {
-            location.setLongitude(((double) cursor.getInt(indexes.longitudeIndex)) / 1E6);
-        }
-        if (!cursor.isNull(indexes.latitudeIndex)) {
-            location.setLatitude(((double) cursor.getInt(indexes.latitudeIndex)) / 1E6);
-        }
-        if (!cursor.isNull(indexes.timeIndex)) {
-            location.setTime(cursor.getLong(indexes.timeIndex));
-        }
-        if (!cursor.isNull(indexes.altitudeIndex)) {
-            location.setAltitude(cursor.getFloat(indexes.altitudeIndex));
-        }
-        if (!cursor.isNull(indexes.accuracyIndex)) {
-            location.setAccuracy(cursor.getFloat(indexes.accuracyIndex));
-        }
-        if (!cursor.isNull(indexes.speedIndex)) {
-            location.setSpeed(cursor.getFloat(indexes.speedIndex));
-        }
-        if (!cursor.isNull(indexes.bearingIndex)) {
-            location.setBearing(cursor.getFloat(indexes.bearingIndex));
-        }
-        if (location instanceof TrackPoint) {
-            TrackPoint sensorDataSetLocation = (TrackPoint) location;
-
-            float heartRate = cursor.isNull(indexes.sensorHeartRateIndex) ? SensorDataSet.DATA_UNAVAILABLE : cursor.getFloat(indexes.sensorHeartRateIndex);
-            float cadence = cursor.isNull(indexes.sensorCadenceIndex) ? SensorDataSet.DATA_UNAVAILABLE : cursor.getFloat(indexes.sensorCadenceIndex);
-            float power = cursor.isNull(indexes.sensorPowerIndex) ? SensorDataSet.DATA_UNAVAILABLE : cursor.getFloat(indexes.sensorPowerIndex);
-
-            sensorDataSetLocation.setSensorDataSet(new SensorDataSet(heartRate, cadence, power, SensorDataSet.DATA_UNAVAILABLE, location.getTime()));
-        }
+    public TrackPointIterator getTrackPointLocationIterator(final long trackId, final long startTrackPointId, final boolean descending, final TrackPointFactory trackPointFactory) {
+        return new TrackPointIterator(this, trackId, startTrackPointId, descending, trackPointFactory);
     }
 
     private Location findTrackPointBy(String selection, String[] selectionArgs) {
@@ -1043,7 +928,11 @@ public class ContentProviderUtils {
      * @param sortOrder     the sort order
      */
     private Cursor getTrackPointCursor(String[] projection, String selection, String[] selectionArgs, String sortOrder) {
-        return contentResolver.query(TrackPointsColumns.CONTENT_URI, projection, selection, selectionArgs, sortOrder);
+        return contentResolver.query(TrackPointsColumns.CONTENT_URI_BY_ID, projection, selection, selectionArgs, sortOrder);
+    }
+
+    int getDefaultCursorBatchSize() {
+        return defaultCursorBatchSize;
     }
 
     /**
@@ -1057,33 +946,24 @@ public class ContentProviderUtils {
     }
 
     /**
-     * A cache of track points indexes.
+     * Formats an array of IDs as comma separated string value
+     *
+     * @param ids   array with IDs
+     * @return comma separated list of ids
      */
-    private static class CachedTrackPointsIndexes {
-        final int idIndex;
-        final int longitudeIndex;
-        final int latitudeIndex;
-        final int timeIndex;
-        final int altitudeIndex;
-        final int accuracyIndex;
-        final int speedIndex;
-        final int bearingIndex;
-        final int sensorHeartRateIndex;
-        final int sensorCadenceIndex;
-        final int sensorPowerIndex;
-
-        CachedTrackPointsIndexes(Cursor cursor) {
-            idIndex = cursor.getColumnIndex(TrackPointsColumns._ID);
-            longitudeIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.LONGITUDE);
-            latitudeIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.LATITUDE);
-            timeIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.TIME);
-            altitudeIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.ALTITUDE);
-            accuracyIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.ACCURACY);
-            speedIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.SPEED);
-            bearingIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.BEARING);
-            sensorHeartRateIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.SENSOR_HEARTRATE);
-            sensorCadenceIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.SENSOR_CADENCE);
-            sensorPowerIndex = cursor.getColumnIndexOrThrow(TrackPointsColumns.SENSOR_POWER);
+    public static String formatIdListForUri(long[] ids) {
+        StringBuilder idsPathSegment = new StringBuilder();
+        for (long id : ids) {
+            if (idsPathSegment.length() > 0) {
+                idsPathSegment.append(ID_SEPARATOR);
+            }
+            idsPathSegment.append(id);
         }
+        return idsPathSegment.toString();
     }
+
+    public static String[] parseTrackIdsFromUri(Uri url) {
+        return TextUtils.split(url.getLastPathSegment(), ID_SEPARATOR);
+    }
+
 }

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

@@ -14,7 +14,7 @@
  * the License.
  */
 
-package de.dennisguse.opentracks.content;
+package de.dennisguse.opentracks.content.provider;
 
 import android.content.ContentProvider;
 import android.content.ContentUris;
@@ -25,7 +25,6 @@ import android.database.Cursor;
 import android.database.SQLException;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteException;
-import android.database.sqlite.SQLiteOpenHelper;
 import android.database.sqlite.SQLiteQueryBuilder;
 import android.net.Uri;
 import android.text.TextUtils;
@@ -45,27 +44,25 @@ import de.dennisguse.opentracks.content.data.WaypointsColumns;
  */
 public abstract class CustomContentProvider extends ContentProvider {
 
-    @VisibleForTesting
-    static final int DATABASE_VERSION = 23;
-
-    @VisibleForTesting
-    static final String DATABASE_NAME = "database.db";
-
     private static final String TAG = CustomContentProvider.class.getSimpleName();
 
+    private static final String SQL_LIST_DELIMITER = ",";
+
     private final UriMatcher uriMatcher;
 
     private SQLiteDatabase db;
 
     public CustomContentProvider() {
         uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
-        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TrackPointsColumns.TABLE_NAME, UrlType.TRACKPOINTS.ordinal());
-        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TrackPointsColumns.TABLE_NAME + "/#", UrlType.TRACKPOINTS_BY_ID.ordinal());
-        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TrackPointsColumns.TABLE_NAME + "/#", UrlType.TRACKPOINTS_BY_TRACKID.ordinal());
-        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TracksColumns.TABLE_NAME, UrlType.TRACKS.ordinal());
-        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TracksColumns.TABLE_NAME + "/#", UrlType.TRACKS_BY_ID.ordinal());
-        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, WaypointsColumns.TABLE_NAME, UrlType.WAYPOINTS.ordinal());
-        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, WaypointsColumns.TABLE_NAME + "/#", UrlType.WAYPOINTS_BY_ID.ordinal());
+        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TrackPointsColumns.CONTENT_URI_BY_ID.getPath(), UrlType.TRACKPOINTS.ordinal());
+        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TrackPointsColumns.CONTENT_URI_BY_ID.getPath() + "/#", UrlType.TRACKPOINTS_BY_ID.ordinal());
+        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TrackPointsColumns.CONTENT_URI_BY_TRACKID.getPath() + "/*", UrlType.TRACKPOINTS_BY_TRACKID.ordinal());
+
+        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TracksColumns.CONTENT_URI.getPath(), UrlType.TRACKS.ordinal());
+        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, TracksColumns.CONTENT_URI.getPath() + "/*", UrlType.TRACKS_BY_ID.ordinal());
+
+        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, WaypointsColumns.CONTENT_URI.getPath(), UrlType.WAYPOINTS.ordinal());
+        uriMatcher.addURI(ContentProviderUtils.AUTHORITY_PACKAGE, WaypointsColumns.CONTENT_URI.getPath() + "/#", UrlType.WAYPOINTS_BY_ID.ordinal());
     }
 
     @Override
@@ -81,7 +78,7 @@ public abstract class CustomContentProvider extends ContentProvider {
      */
     @VisibleForTesting
     boolean onCreate(Context context) {
-        DatabaseHelper databaseHelper = new DatabaseHelper(context);
+        CustomSQLiteOpenHelper databaseHelper = new CustomSQLiteOpenHelper(context);
         try {
             db = databaseHelper.getWritableDatabase();
         } catch (SQLiteException e) {
@@ -134,7 +131,6 @@ public abstract class CustomContentProvider extends ContentProvider {
             case TRACKPOINTS:
                 return TrackPointsColumns.CONTENT_TYPE;
             case TRACKPOINTS_BY_ID:
-                return TrackPointsColumns.CONTENT_ITEMTYPE;
             case TRACKPOINTS_BY_TRACKID:
                 return TrackPointsColumns.CONTENT_ITEMTYPE;
             case TRACKS:
@@ -201,11 +197,11 @@ public abstract class CustomContentProvider extends ContentProvider {
                 break;
             case TRACKPOINTS_BY_ID:
                 queryBuilder.setTables(TrackPointsColumns.TABLE_NAME);
-                queryBuilder.appendWhere(TrackPointsColumns._ID + "=" + url.getPathSegments().get(1));
+                queryBuilder.appendWhere(TrackPointsColumns._ID + "=" + ContentUris.parseId(url));
                 break;
             case TRACKPOINTS_BY_TRACKID:
                 queryBuilder.setTables(TrackPointsColumns.TABLE_NAME);
-                queryBuilder.appendWhere(TrackPointsColumns.TRACKID + "=" + url.getPathSegments().get(1));
+                queryBuilder.appendWhere(TrackPointsColumns.TRACKID + " IN (" + TextUtils.join(SQL_LIST_DELIMITER, ContentProviderUtils.parseTrackIdsFromUri(url)) + ")");
                 break;
             case TRACKS:
                 queryBuilder.setTables(TracksColumns.TABLE_NAME);
@@ -213,7 +209,7 @@ public abstract class CustomContentProvider extends ContentProvider {
                 break;
             case TRACKS_BY_ID:
                 queryBuilder.setTables(TracksColumns.TABLE_NAME);
-                queryBuilder.appendWhere(TracksColumns._ID + "=" + url.getPathSegments().get(1));
+                queryBuilder.appendWhere(TracksColumns._ID + " IN (" + TextUtils.join(SQL_LIST_DELIMITER, ContentProviderUtils.parseTrackIdsFromUri(url)) + ")");
                 break;
             case WAYPOINTS:
                 queryBuilder.setTables(WaypointsColumns.TABLE_NAME);
@@ -221,7 +217,7 @@ public abstract class CustomContentProvider extends ContentProvider {
                 break;
             case WAYPOINTS_BY_ID:
                 queryBuilder.setTables(WaypointsColumns.TABLE_NAME);
-                queryBuilder.appendWhere(WaypointsColumns._ID + "=" + url.getPathSegments().get(1));
+                queryBuilder.appendWhere(WaypointsColumns._ID + "=" + ContentUris.parseId(url));
                 break;
             default:
                 throw new IllegalArgumentException("Unknown url " + url);
@@ -243,7 +239,7 @@ public abstract class CustomContentProvider extends ContentProvider {
                 break;
             case TRACKPOINTS_BY_ID:
                 table = TrackPointsColumns.TABLE_NAME;
-                whereClause = TrackPointsColumns._ID + "=" + url.getPathSegments().get(1);
+                whereClause = TrackPointsColumns._ID + "=" + ContentUris.parseId(url);
                 if (!TextUtils.isEmpty(where)) {
                     whereClause += " AND (" + where + ")";
                 }
@@ -254,7 +250,7 @@ public abstract class CustomContentProvider extends ContentProvider {
                 break;
             case TRACKS_BY_ID:
                 table = TracksColumns.TABLE_NAME;
-                whereClause = TracksColumns._ID + "=" + url.getPathSegments().get(1);
+                whereClause = TracksColumns._ID + "=" + ContentUris.parseId(url);
                 if (!TextUtils.isEmpty(where)) {
                     whereClause += " AND (" + where + ")";
                 }
@@ -265,7 +261,7 @@ public abstract class CustomContentProvider extends ContentProvider {
                 break;
             case WAYPOINTS_BY_ID:
                 table = WaypointsColumns.TABLE_NAME;
-                whereClause = WaypointsColumns._ID + "=" + url.getPathSegments().get(1);
+                whereClause = WaypointsColumns._ID + "=" + ContentUris.parseId(url);
                 if (!TextUtils.isEmpty(where)) {
                     whereClause += " AND (" + where + ")";
                 }
@@ -290,8 +286,15 @@ public abstract class CustomContentProvider extends ContentProvider {
      *
      * @param url the url
      */
+    @NonNull
     private UrlType getUrlType(Uri url) {
-        return UrlType.values()[uriMatcher.match(url)];
+        UrlType[] urlTypes = UrlType.values();
+        int matchIndex = uriMatcher.match(url);
+        if (0 <= matchIndex && matchIndex < urlTypes.length) {
+            return urlTypes[matchIndex];
+        }
+
+        throw new IllegalArgumentException("Unknown URL " + url);
     }
 
     /**
@@ -329,7 +332,7 @@ public abstract class CustomContentProvider extends ContentProvider {
         }
         long rowId = db.insert(TrackPointsColumns.TABLE_NAME, TrackPointsColumns._ID, values);
         if (rowId >= 0) {
-            return ContentUris.appendId(TrackPointsColumns.CONTENT_URI.buildUpon(), rowId).build();
+            return ContentUris.appendId(TrackPointsColumns.CONTENT_URI_BY_ID.buildUpon(), rowId).build();
         }
         throw new SQLiteException("Failed to insert a track point " + url);
     }
@@ -381,31 +384,4 @@ public abstract class CustomContentProvider extends ContentProvider {
         WAYPOINTS,
         WAYPOINTS_BY_ID
     }
-
-    /**
-     * Database helper for creating and upgrading the database.
-     */
-    @VisibleForTesting
-    static class DatabaseHelper extends SQLiteOpenHelper {
-
-        public DatabaseHelper(Context context) {
-            this(context, DATABASE_NAME);
-        }
-
-        @VisibleForTesting
-        public DatabaseHelper(Context context, String databaseName) {
-            super(context, databaseName, null, DATABASE_VERSION);
-        }
-
-        @Override
-        public void onCreate(SQLiteDatabase db) {
-            db.execSQL(TrackPointsColumns.CREATE_TABLE);
-            db.execSQL(TracksColumns.CREATE_TABLE);
-            db.execSQL(WaypointsColumns.CREATE_TABLE);
-        }
-
-        @Override
-        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
-        }
-    }
-}
+}

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

@@ -0,0 +1,44 @@
+package de.dennisguse.opentracks.content.provider;
+
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+
+import androidx.annotation.VisibleForTesting;
+
+import de.dennisguse.opentracks.content.data.TrackPointsColumns;
+import de.dennisguse.opentracks.content.data.TracksColumns;
+import de.dennisguse.opentracks.content.data.WaypointsColumns;
+
+/**
+ * Database helper for creating and upgrading the database.
+ */
+@VisibleForTesting
+public class CustomSQLiteOpenHelper extends SQLiteOpenHelper {
+
+    @VisibleForTesting
+    static final int DATABASE_VERSION = 23;
+
+    @VisibleForTesting
+    static final String DATABASE_NAME = "database.db";
+
+    public CustomSQLiteOpenHelper(Context context) {
+        this(context, DATABASE_NAME);
+    }
+
+    @VisibleForTesting
+    public CustomSQLiteOpenHelper(Context context, String databaseName) {
+        super(context, databaseName, null, DATABASE_VERSION);
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        db.execSQL(TrackPointsColumns.CREATE_TABLE);
+        db.execSQL(TracksColumns.CREATE_TABLE);
+        db.execSQL(WaypointsColumns.CREATE_TABLE);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+    }
+}

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

@@ -1,4 +1,4 @@
-package de.dennisguse.opentracks.content;
+package de.dennisguse.opentracks.content.provider;
 
 import android.content.Context;
 import android.content.UriMatcher;

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

@@ -1,6 +1,5 @@
-package de.dennisguse.opentracks.content;
+package de.dennisguse.opentracks.content.provider;
 
-import android.location.Location;
 import android.location.LocationManager;
 
 import de.dennisguse.opentracks.content.data.TrackPoint;
@@ -9,14 +8,14 @@ import de.dennisguse.opentracks.content.data.TrackPoint;
  * Creates a new {@link TrackPoint}.
  * An implementation can create new instances or reuse existing instances for optimization.
  */
-public class LocationFactory {
+public class TrackPointFactory {
 
     /**
-     * The default {@link LocationFactory} which creates a location each time.
+     * The default {@link TrackPointFactory} which creates a location each time.
      */
-    public static LocationFactory DEFAULT_LOCATION_FACTORY = new LocationFactory();
+    public static final TrackPointFactory DEFAULT_LOCATION_FACTORY = new TrackPointFactory();
 
-    public Location createLocation() {
+    public TrackPoint createLocation() {
         return new TrackPoint(LocationManager.GPS_PROVIDER);
     }
 }

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

@@ -0,0 +1,111 @@
+package de.dennisguse.opentracks.content.provider;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+import de.dennisguse.opentracks.content.data.TrackPoint;
+
+/**
+ * A lightweight wrapper around the original {@link Cursor} with a method to clean up.
+ */
+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 boolean descending;
+    private final TrackPointFactory trackPointFactory;
+    private final CachedTrackPointsIndexes indexes;
+    private long lastTrackPointId = -1L;
+    private Cursor cursor;
+
+
+    public TrackPointIterator(ContentProviderUtils contentProviderUtils, long trackId, long startTrackPointId, boolean descending, TrackPointFactory trackPointFactory) {
+        if (trackPointFactory == null) {
+            throw new IllegalArgumentException("trackPointFactory is null");
+        }
+
+        this.contentProviderUtils = contentProviderUtils;
+        this.trackId = trackId;
+        this.descending = descending;
+        this.trackPointFactory = trackPointFactory;
+
+        cursor = getCursor(startTrackPointId);
+        indexes = cursor != null ? new CachedTrackPointsIndexes(cursor)
+                : null;
+    }
+
+    /**
+     * Gets the track point cursor.
+     *
+     * @param trackPointId the starting track point id
+     */
+    private Cursor getCursor(long trackPointId) {
+        return contentProviderUtils.getTrackPointCursor(trackId, trackPointId, contentProviderUtils.getDefaultCursorBatchSize(), descending);
+    }
+
+    /**
+     * Advances the cursor to the next batch. Returns true if successful.
+     */
+    private boolean advanceCursorToNextBatch() {
+        long trackPointId = lastTrackPointId == -1L ? -1L : lastTrackPointId + (descending ? -1 : 1);
+        Log.d(TAG, "Advancing track point id: " + trackPointId);
+        cursor.close();
+        cursor = getCursor(trackPointId);
+        return cursor != null;
+    }
+
+    public long getTrackPointId() {
+        return lastTrackPointId;
+    }
+
+    @Override
+    public boolean hasNext() {
+        if (cursor == null) {
+            return false;
+        }
+        if (cursor.isAfterLast()) {
+            return false;
+        }
+        if (cursor.isLast()) {
+            if (cursor.getCount() != contentProviderUtils.getDefaultCursorBatchSize()) {
+                return false;
+            }
+            return advanceCursorToNextBatch() && !cursor.isAfterLast();
+        }
+        return true;
+    }
+
+    @Override
+    public TrackPoint next() {
+        if (cursor == null) {
+            throw new NoSuchElementException();
+        }
+        if (!cursor.moveToNext()) {
+            if (!advanceCursorToNextBatch() || !cursor.moveToNext()) {
+                throw new NoSuchElementException();
+            }
+        }
+        lastTrackPointId = cursor.getLong(indexes.idIndex);
+        TrackPoint trackPoint = trackPointFactory.createLocation();
+        ContentProviderUtils.fillTrackPoint(cursor, indexes, trackPoint);
+        return trackPoint;
+    }
+
+    @Override
+    public void close() {
+        if (cursor != null) {
+            cursor.close();
+            cursor = null;
+        }
+    }
+
+    @Override
+    public void remove() {
+        throw new UnsupportedOperationException();
+    }
+}

src/main/java/de/dennisguse/opentracks/content/sensor/SensorState.java

@@ -20,7 +20,6 @@ public enum SensorState {
             case CONNECTED:
                 return c.getString(R.string.sensor_state_connected);
             case DISCONNECTING:
-                return c.getString(R.string.sensor_state_disconnected);
             case DISCONNECTED:
                 return c.getString(R.string.sensor_state_disconnected);
             default:

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

@@ -1,10 +0,0 @@
-package de.dennisguse.opentracks.fragments;
-
-public class ChartDistanceFragment extends ChartFragment {
-
-    public static final String CHART_FRAGMENT_TAG = ChartDistanceFragment.class.getSimpleName();
-
-    public ChartDistanceFragment() {
-        super(true);
-    }
-}

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

@@ -16,6 +16,7 @@
 
 package de.dennisguse.opentracks.fragments;
 
+import android.content.SharedPreferences;
 import android.location.Location;
 import android.os.Bundle;
 import android.view.LayoutInflater;
@@ -24,7 +25,6 @@ import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentActivity;
@@ -55,9 +55,18 @@ import de.dennisguse.opentracks.util.UnitConversions;
  * @author Sandor Dornbush
  * @author Rodrigo Damazio
  */
-public abstract class ChartFragment extends Fragment implements TrackDataListener {
+public class ChartFragment extends Fragment implements TrackDataListener {
 
-    private static final String STATE_CHART_VIEW_BY_DISTANCE_KEY = "chartViewByDistance";
+    private static final String KEY_CHART_VIEW_BY_DISTANCE_KEY = "chartViewByDistance";
+
+    public static Fragment newInstance(boolean chartByDistance) {
+        Bundle bundle = new Bundle();
+        bundle.putBoolean(KEY_CHART_VIEW_BY_DISTANCE_KEY, chartByDistance);
+
+        ChartFragment chartFragment = new ChartFragment();
+        chartFragment.setArguments(bundle);
+        return chartFragment;
+    }
 
     private final List<double[]> pendingPoints = new ArrayList<>();
 
@@ -73,11 +82,56 @@ public abstract class ChartFragment extends Fragment implements TrackDataListene
 
     // Modes of operation
     private boolean chartByDistance;
-    private boolean[] chartShow = new boolean[]{true, true, true, true, true, true};
+    private final boolean[] chartShow = new boolean[]{true, true, true, true, true, true};
 
     // UI elements
     private ChartView chartView;
 
+    private final SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() {
+        @Override
+        public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
+            if (!isResumed()) {
+                return;
+            }
+            if (PreferencesUtils.isKey(getContext(), R.string.stats_units_key, key)) {
+                boolean metric = PreferencesUtils.isMetricUnits(getContext());
+                if (metricUnits != metric) {
+                    metricUnits = metric;
+                    chartView.setMetricUnits(metricUnits);
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            if (isResumed()) {
+                                chartView.requestLayout();
+                            }
+                        }
+                    });
+                }
+            }
+            if (PreferencesUtils.isKey(getContext(), R.string.stats_rate_key, key)) {
+                boolean speed = PreferencesUtils.isReportSpeed(getContext());
+                if (reportSpeed != speed) {
+                    reportSpeed = speed;
+                    chartView.setReportSpeed(reportSpeed);
+                    setSeriesEnabled(ChartView.SPEED_SERIES, reportSpeed);
+                    setSeriesEnabled(ChartView.PACE_SERIES, !reportSpeed);
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            if (isResumed()) {
+                                chartView.requestLayout();
+                            }
+                        }
+                    });
+                }
+            }
+
+            if (PreferencesUtils.isKey(getContext(), R.string.recording_distance_interval_key, key)) {
+                recordingDistanceInterval = PreferencesUtils.getRecordingDistanceInterval(getContext());
+            }
+        }
+    };
+
     /**
      * A runnable that will set the orange pointer as appropriate and redraw.
      */
@@ -93,14 +147,13 @@ public abstract class ChartFragment extends Fragment implements TrackDataListene
         }
     };
 
-    public ChartFragment(boolean chartByDistance) {
-        this.chartByDistance = chartByDistance;
-    }
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        chartByDistance = getArguments().getBoolean(KEY_CHART_VIEW_BY_DISTANCE_KEY, chartByDistance);
+
         recordingDistanceInterval = PreferencesUtils.getRecordingDistanceIntervalDefault(getContext());
 
         // Create a chartView here to store data thus won't need to reload all the data on every onStart or onResume.
@@ -124,6 +177,8 @@ public abstract class ChartFragment extends Fragment implements TrackDataListene
     public void onResume() {
         super.onResume();
         resumeTrackDataHub();
+        PreferencesUtils.register(getContext(), sharedPreferenceChangeListener);
+
         checkChartSettings();
         getActivity().runOnUiThread(updateChart);
     }
@@ -132,6 +187,7 @@ public abstract class ChartFragment extends Fragment implements TrackDataListene
     public void onPause() {
         super.onPause();
         pauseTrackDataHub();
+        PreferencesUtils.register(getContext(), sharedPreferenceChangeListener);
     }
 
     @Override
@@ -141,20 +197,6 @@ public abstract class ChartFragment extends Fragment implements TrackDataListene
         layout.removeView(chartView);
     }
 
-    @Override
-    public void onSaveInstanceState(@NonNull Bundle outState) {
-        super.onSaveInstanceState(outState);
-        outState.putBoolean(STATE_CHART_VIEW_BY_DISTANCE_KEY, chartByDistance);
-    }
-
-    @Override
-    public void onViewStateRestored(@Nullable Bundle savedInstanceState) {
-        super.onViewStateRestored(savedInstanceState);
-        if (savedInstanceState != null) {
-            chartByDistance = savedInstanceState.getBoolean(STATE_CHART_VIEW_BY_DISTANCE_KEY);
-        }
-    }
-
     @Override
     public void onTrackUpdated(Track track) {
         if (isResumed()) {
@@ -229,68 +271,6 @@ public abstract class ChartFragment extends Fragment implements TrackDataListene
         }
     }
 
-    @Override
-    public boolean onMetricUnitsChanged(boolean metric) {
-        if (isResumed()) {
-            if (metricUnits == metric) {
-                return false;
-            }
-            metricUnits = metric;
-            chartView.setMetricUnits(metricUnits);
-            runOnUiThread(new Runnable() {
-                @Override
-                public void run() {
-                    if (isResumed()) {
-                        chartView.requestLayout();
-                    }
-                }
-            });
-            return true;
-        }
-        return false;
-    }
-
-    @Override
-    public boolean onReportSpeedChanged(boolean speed) {
-        if (isResumed()) {
-            if (reportSpeed == speed) {
-                return false;
-            }
-            reportSpeed = speed;
-            chartView.setReportSpeed(reportSpeed);
-            setSeriesEnabled(ChartView.SPEED_SERIES, reportSpeed);
-            setSeriesEnabled(ChartView.PACE_SERIES, !reportSpeed);
-            runOnUiThread(new Runnable() {
-                @Override
-                public void run() {
-                    if (isResumed()) {
-                        chartView.requestLayout();
-                    }
-                }
-            });
-            return true;
-        }
-        return false;
-    }
-
-    @Override
-    public boolean onRecordingGpsAccuracy(int minRequiredAccuracy) {
-        // We don't care.
-        return false;
-    }
-
-    @Override
-    public boolean onRecordingDistanceIntervalChanged(int value) {
-        if (isResumed()) {
-            if (recordingDistanceInterval == value) {
-                return false;
-            }
-            recordingDistanceInterval = value;
-            return true;
-        }
-        return false;
-    }
-
     /**
      * Checks the chart settings.
      */
@@ -334,7 +314,7 @@ public abstract class ChartFragment extends Fragment implements TrackDataListene
         trackDataHub = ((TrackDetailActivity) getActivity()).getTrackDataHub();
         trackDataHub.registerTrackDataListener(this, EnumSet.of(TrackDataType.TRACKS_TABLE,
                 TrackDataType.WAYPOINTS_TABLE, TrackDataType.SAMPLED_IN_TRACK_POINTS_TABLE,
-                TrackDataType.SAMPLED_OUT_TRACK_POINTS_TABLE, TrackDataType.PREFERENCE));
+                TrackDataType.SAMPLED_OUT_TRACK_POINTS_TABLE));
     }
 
     /**

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

@@ -1,10 +0,0 @@
-package de.dennisguse.opentracks.fragments;
-
-public class ChartTimeFragment extends ChartFragment {
-
-    public static final String CHART_FRAGMENT_TAG = ChartTimeFragment.class.getSimpleName();
-
-    public ChartTimeFragment() {
-        super(false);
-    }
-}

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

@@ -39,7 +39,7 @@ public class ChooseActivityTypeDialogFragment extends DialogFragment implements
         return TrackIconUtils.getAllIconValues().indexOf(iconValue);
     }
 
-    private String preselectedCategory;
+    private final String preselectedCategory;
 
     private ChooseActivityTypeCaller chooseActivityTypeCaller;
 
@@ -71,7 +71,6 @@ public class ChooseActivityTypeDialogFragment extends DialogFragment implements
         int position = getPosition(getContext(), preselectedCategory);
         if (position != -1) {
             imageAdapter.setSelected(position);
-            imageAdapter.notifyDataSetChanged();
         }
 
         gridView.setOnItemClickListener(this);

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

@@ -56,12 +56,9 @@ public class ChooseActivityTypeImageAdapter extends BaseAdapter {
         return 0;
     }
 
-    public int getSelected() {
-        return selected;
-    }
-
     public void setSelected(int position) {
         selected = position;
+        notifyDataSetChanged();
     }
 
     @Override

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

@@ -36,12 +36,9 @@ import de.dennisguse.opentracks.util.DialogUtils;
 public class ConfirmDeleteDialogFragment extends DialogFragment {
 
     private static final String CONFIRM_DELETE_DIALOG_TAG = "confirmDeleteDialog";
-    private ConfirmDeleteCaller caller;
-    private long[] trackIds;
+    private static final String KEY_TRACK_IDS = "trackIds";
 
-    public ConfirmDeleteDialogFragment(long[] trackIds) {
-        this.trackIds = trackIds;
-    }
+    private ConfirmDeleteCaller caller;
 
     /**
      * Create a new instance.
@@ -49,7 +46,12 @@ public class ConfirmDeleteDialogFragment extends DialogFragment {
      * @param trackIds list of track ids to delete. To delete all, set to size 1 with trackIds[0] == -1L
      */
     public static void showDialog(FragmentManager fragmentManager, long[] trackIds) {
-        new ConfirmDeleteDialogFragment(trackIds).show(fragmentManager, CONFIRM_DELETE_DIALOG_TAG);
+        Bundle bundle = new Bundle();
+        bundle.putLongArray(KEY_TRACK_IDS, trackIds);
+
+        ConfirmDeleteDialogFragment deleteTrackDialogFragment = new ConfirmDeleteDialogFragment();
+        deleteTrackDialogFragment.setArguments(bundle);
+        deleteTrackDialogFragment.show(fragmentManager, CONFIRM_DELETE_DIALOG_TAG);
     }
 
     @Override
@@ -65,6 +67,8 @@ public class ConfirmDeleteDialogFragment extends DialogFragment {
     @Override
     @NonNull
     public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final long[] trackIds = getArguments().getLongArray(KEY_TRACK_IDS);
+
         int titleId;
         int messageId;
         titleId = trackIds.length > 1 ? R.string.generic_delete_selected_confirm_title : R.string.track_delete_one_confirm_title;

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

@@ -27,7 +27,7 @@ import androidx.fragment.app.FragmentActivity;
 import androidx.fragment.app.FragmentManager;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.util.DialogUtils;
 
 /**
@@ -38,16 +38,17 @@ import de.dennisguse.opentracks.util.DialogUtils;
 public class DeleteMarkerDialogFragment extends DialogFragment {
 
     private static final String DELETE_MARKER_DIALOG_TAG = "deleteMarkerDialog";
-    private long[] markerIds;
+    private static final String KEY_MARKER_IDS = "markerIds";
 
     private DeleteMarkerCaller caller;
 
-    public DeleteMarkerDialogFragment(long[] markerIds) {
-        this.markerIds = markerIds;
-    }
-
     public static void showDialog(FragmentManager fragmentManager, long[] markerIds) {
-        new DeleteMarkerDialogFragment(markerIds).show(fragmentManager, DELETE_MARKER_DIALOG_TAG);
+        Bundle bundle = new Bundle();
+        bundle.putLongArray(KEY_MARKER_IDS, markerIds);
+
+        DeleteMarkerDialogFragment deleteMarkerDialogFragment = new DeleteMarkerDialogFragment();
+        deleteMarkerDialogFragment.setArguments(bundle);
+        deleteMarkerDialogFragment.show(fragmentManager, DELETE_MARKER_DIALOG_TAG);
     }
 
     @Override
@@ -63,6 +64,8 @@ public class DeleteMarkerDialogFragment extends DialogFragment {
     @Override
     @NonNull
     public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final long[] markerIds = getArguments().getLongArray(KEY_MARKER_IDS);
+
         final FragmentActivity fragmentActivity = getActivity();
         int titleId;
         int messageId;
@@ -82,7 +85,7 @@ public class DeleteMarkerDialogFragment extends DialogFragment {
                             public void run() {
                                 ContentProviderUtils contentProviderUtils = new ContentProviderUtils(fragmentActivity);
                                 for (long markerId : markerIds) {
-                                    contentProviderUtils.deleteWaypoint(fragmentActivity, markerId);
+                                    contentProviderUtils.deleteWaypoint(markerId);
                                 }
                                 caller.onDeleteMarkerDone();
                             }

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

@@ -40,18 +40,19 @@ import de.dennisguse.opentracks.io.file.TrackFileFormat;
 public class FileTypeDialogFragment extends DialogFragment {
 
     private static final String FILE_TYPE_DIALOG_TAG = "fileType";
-    private int titleId;
+    private static final String KEY_TITLE_ID = "titleId";
+    private static final String KEY_OPTION_ID = "optionId";
 
     private FileTypeCaller caller;
-    private int optionId;
-
-    public FileTypeDialogFragment(int titleId, int optionId) {
-        this.titleId = titleId;
-        this.optionId = optionId;
-    }
 
     public static void showDialog(FragmentManager fragmentManager, int titleId, int optionId) {
-        new FileTypeDialogFragment(titleId, optionId).show(fragmentManager, FILE_TYPE_DIALOG_TAG);
+        Bundle bundle = new Bundle();
+        bundle.putInt(KEY_TITLE_ID, titleId);
+        bundle.putInt(KEY_OPTION_ID, optionId);
+
+        FileTypeDialogFragment fileTypeDialogFragment = new FileTypeDialogFragment();
+        fileTypeDialogFragment.setArguments(bundle);
+        fileTypeDialogFragment.show(fragmentManager, FILE_TYPE_DIALOG_TAG);
     }
 
     @Override
@@ -67,12 +68,17 @@ public class FileTypeDialogFragment extends DialogFragment {
     @Override
     @NonNull
     public Dialog onCreateDialog(Bundle savedInstanceState) {
-        final TrackFileFormat[] trackFileFormats = {TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA_AND_PICTURES, TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA, TrackFileFormat.GPX};
+        int optionId = getArguments().getInt(KEY_OPTION_ID);
+        final int titleId = getArguments().getInt(KEY_TITLE_ID);
+
+        final TrackFileFormat[] trackFileFormats = {TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA_AND_PICTURES, TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA, TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA, TrackFileFormat.GPX};
         String[] choices = new String[trackFileFormats.length];
         for (int i = 0; i < choices.length; i++) {
             TrackFileFormat trackFileFormat = trackFileFormats[i];
             String trackFileFormatUpperCase = trackFileFormat.getExtension().toUpperCase(Locale.US); //ASCII upper case
-            choices[i] = getString(optionId, trackFileFormatUpperCase);
+            int photoMessageId = trackFileFormat.includesPhotos() ? R.string.export_with_photos : R.string.export_without_photos;
+            String trackFileFormatDisplayName = String.format("%s (%s)", trackFileFormatUpperCase, getString(photoMessageId));
+            choices[i] = getString(optionId, trackFileFormatDisplayName);
         }
         return new AlertDialog.Builder(getActivity())
                 .setNegativeButton(R.string.generic_cancel, new OnClickListener() {

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

@@ -40,8 +40,8 @@ import androidx.fragment.app.FragmentActivity;
 
 import de.dennisguse.opentracks.MarkerEditActivity;
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.Waypoint;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.util.IntentUtils;
 import de.dennisguse.opentracks.util.ListItemUtils;
 import de.dennisguse.opentracks.util.MarkerUtils;
@@ -57,14 +57,16 @@ public class MarkerDetailFragment extends Fragment {
 
     private static final String TAG = MarkerDetailFragment.class.getSimpleName();
     private static final String KEY_MARKER_ID = "markerId";
-    private static final long HIDE_TEXT_DELAY = 4 * UnitConversions.ONE_SECOND;
+
+    private static final long HIDE_TEXT_DELAY = 4 * UnitConversions.ONE_SECOND_MS;
+
     private ContentProviderUtils contentProviderUtils;
     private Handler handler;
     private ImageView photoView;
     private ImageView textGradient;
     private LinearLayout waypointInfo;
     private Waypoint waypoint;
-    private Runnable hideText = new Runnable() {
+    private final Runnable hideText = new Runnable() {
         @Override
         public void run() {
             Animation animation = AnimationUtils.loadAnimation(getActivity(), R.anim.fadeout);
@@ -219,7 +221,7 @@ public class MarkerDetailFragment extends Fragment {
             photoView.setImageResource(MarkerUtils.ICON_ID);
         }
 
-        setName(R.id.marker_detail_waypoint_name, hasPhoto);
+        setName(hasPhoto);
 
         TextView category = getView().findViewById(R.id.marker_detail_waypoint_category);
         ListItemUtils.setTextView(getActivity(), category, StringUtils.getCategory(waypoint.getCategory()), hasPhoto);
@@ -227,16 +229,16 @@ public class MarkerDetailFragment extends Fragment {
         TextView description = getView().findViewById(R.id.marker_detail_waypoint_description);
         ListItemUtils.setTextView(getActivity(), description, waypoint.getDescription(), hasPhoto);
 
-        setLocation(R.id.marker_detail_waypoint_location, hasPhoto);
+        setLocation(hasPhoto);
     }
 
-    private void setName(int resId, boolean addShadow) {
-        TextView textView = getView().findViewById(resId);
+    private void setName(boolean addShadow) {
+        TextView textView = getView().findViewById(R.id.marker_detail_waypoint_name);
         ListItemUtils.setTextView(getActivity(), textView, waypoint.getName(), addShadow);
     }
 
-    private void setLocation(int resId, boolean addShadow) {
-        TextView textView = getView().findViewById(resId);
+    private void setLocation(boolean addShadow) {
+        TextView textView = getView().findViewById(R.id.marker_detail_waypoint_location);
         Location location = waypoint.getLocation();
         String value;
         if (location == null) {

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

@@ -16,6 +16,7 @@
 
 package de.dennisguse.opentracks.fragments;
 
+import android.content.SharedPreferences;
 import android.location.Location;
 import android.os.Bundle;
 import android.os.Handler;
@@ -43,8 +44,8 @@ import de.dennisguse.opentracks.content.TrackDataType;
 import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.Waypoint;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
-import de.dennisguse.opentracks.services.ITrackRecordingService;
 import de.dennisguse.opentracks.services.TrackRecordingServiceConnection;
+import de.dennisguse.opentracks.services.TrackRecordingServiceInterface;
 import de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager;
 import de.dennisguse.opentracks.stats.TripStatistics;
 import de.dennisguse.opentracks.util.LocationUtils;
@@ -61,9 +62,9 @@ import de.dennisguse.opentracks.util.UnitConversions;
  */
 public class StatsFragment extends Fragment implements TrackDataListener {
 
-    public static final String STATS_FRAGMENT_TAG = StatsFragment.class.getSimpleName();
+    private static final String STATS_FRAGMENT_TAG = StatsFragment.class.getSimpleName();
 
-    private static final long UI_UPDATE_INTERVAL = UnitConversions.ONE_SECOND;
+    private static final long UI_UPDATE_INTERVAL = UnitConversions.ONE_SECOND_MS;
 
     private TrackDataHub trackDataHub;
     private Handler handlerUpdateUI;
@@ -75,8 +76,30 @@ public class StatsFragment extends Fragment implements TrackDataListener {
     private TripStatistics lastTripStatistics = null;
 
     private String category = "";
+    @Deprecated //TODO This should be handled somewhere else; not in the UI.
     private int recordingGpsAccuracy;
 
+    private final SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() {
+        @Override
+        public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
+            if (PreferencesUtils.isKey(getContext(), R.string.stats_units_key, key) || PreferencesUtils.isKey(getContext(), R.string.stats_rate_key, key)) {
+                if (isResumed()) {
+                    getActivity().runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            if (isResumed()) {
+                                updateUI();
+                            }
+                        }
+                    });
+                }
+            }
+            if (PreferencesUtils.isKey(getContext(), R.string.recording_track_id_key, key)) {
+                recordingGpsAccuracy = PreferencesUtils.getRecordingGPSAccuracy(getContext());
+            }
+        }
+    };
+
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         return inflater.inflate(R.layout.stats, container, false);
@@ -221,6 +244,7 @@ public class StatsFragment extends Fragment implements TrackDataListener {
     public void onResume() {
         super.onResume();
         resumeTrackDataHub();
+        PreferencesUtils.register(getContext(), sharedPreferenceChangeListener);
 
         trackRecordingServiceConnection = new TrackRecordingServiceConnection(getContext(), null);
         trackRecordingServiceConnection.startConnection(getContext());
@@ -232,6 +256,8 @@ public class StatsFragment extends Fragment implements TrackDataListener {
     public void onPause() {
         super.onPause();
         pauseTrackDataHub();
+        PreferencesUtils.unregister(getContext(), sharedPreferenceChangeListener);
+
         handlerUpdateUI.removeCallbacks(updateUIeachSecond);
     }
 
@@ -370,48 +396,6 @@ public class StatsFragment extends Fragment implements TrackDataListener {
         // We don't care.
     }
 
-    @Override
-    public boolean onMetricUnitsChanged(final boolean metric) {
-        if (isResumed()) {
-            getActivity().runOnUiThread(new Runnable() {
-                @Override
-                public void run() {
-                    if (isResumed()) {
-                        updateUI();
-                    }
-                }
-            });
-        }
-        return true;
-    }
-
-    @Override
-    public boolean onReportSpeedChanged(final boolean speed) {
-        if (isResumed()) {
-            getActivity().runOnUiThread(new Runnable() {
-                @Override
-                public void run() {
-                    if (isResumed()) {
-                        updateUI();
-                    }
-                }
-            });
-        }
-        return true;
-    }
-
-    @Override
-    public boolean onRecordingGpsAccuracy(int newValue) {
-        recordingGpsAccuracy = newValue;
-        return false;
-    }
-
-    @Override
-    public boolean onRecordingDistanceIntervalChanged(int minRecordingDistance) {
-        // We don't care.
-        return false;
-    }
-
     /**
      * Resumes the trackDataHub.
      * Needs to be synchronized because trackDataHub can be accessed by multiple threads.
@@ -419,8 +403,7 @@ public class StatsFragment extends Fragment implements TrackDataListener {
     private synchronized void resumeTrackDataHub() {
         trackDataHub = ((TrackDetailActivity) getActivity()).getTrackDataHub();
         trackDataHub.registerTrackDataListener(this, EnumSet.of(TrackDataType.TRACKS_TABLE,
-                TrackDataType.SAMPLED_IN_TRACK_POINTS_TABLE, TrackDataType.SAMPLED_OUT_TRACK_POINTS_TABLE,
-                TrackDataType.PREFERENCE));
+                TrackDataType.SAMPLED_IN_TRACK_POINTS_TABLE, TrackDataType.SAMPLED_OUT_TRACK_POINTS_TABLE));
     }
 
     /**
@@ -458,7 +441,7 @@ public class StatsFragment extends Fragment implements TrackDataListener {
      * Tries to fetch most recent {@link SensorDataSet} {@link de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager}.
      */
     private void updateSensorDataUI() {
-        ITrackRecordingService trackRecordingService = trackRecordingServiceConnection.getServiceIfBound();
+        TrackRecordingServiceInterface trackRecordingService = trackRecordingServiceConnection.getServiceIfBound();
 
         SensorDataSet sensorDataSet = null;
         if (trackRecordingService == null) {

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

@@ -5,8 +5,8 @@ import android.content.Context;
 import java.util.Locale;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 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;
 import de.dennisguse.opentracks.io.file.exporter.KmlTrackWriter;
@@ -67,7 +67,7 @@ public enum TrackFileFormat {
     },
     KMZ_ONLY_TRACK {
 
-        private final static boolean exportPhotos = false;
+        private static final boolean exportPhotos = false;
 
         @Override
         public TrackWriter newTrackWriter(Context context, boolean multiple) {
@@ -86,10 +86,15 @@ public enum TrackFileFormat {
         public String getExtension() {
             return "kmz";
         }
+
+        @Override
+        public boolean includesPhotos() {
+            return exportPhotos;
+        }
     },
     KMZ_WITH_TRACKDETAIL {
 
-        private final static boolean exportPhotos = false;
+        private static final boolean exportPhotos = false;
 
         @Override
         public TrackWriter newTrackWriter(Context context, boolean multiple) {
@@ -108,10 +113,16 @@ public enum TrackFileFormat {
         public String getExtension() {
             return "kmz";
         }
+
+        @Override
+        public boolean includesPhotos() {
+            return exportPhotos;
+        }
+
     },
     KMZ_WITH_TRACKDETAIL_AND_SENSORDATA {
 
-        private final static boolean exportPhotos = false;
+        private static final boolean exportPhotos = false;
 
         @Override
         public TrackWriter newTrackWriter(Context context, boolean multiple) {
@@ -130,10 +141,17 @@ public enum TrackFileFormat {
         public String getExtension() {
             return "kmz";
         }
+
+        @Override
+        public boolean includesPhotos() {
+            return exportPhotos;
+        }
+
+
     },
     KMZ_WITH_TRACKDETAIL_AND_SENSORDATA_AND_PICTURES {
 
-        private final static boolean exportPhotos = true;
+        private static final boolean exportPhotos = true;
 
         @Override
         public TrackWriter newTrackWriter(Context context, boolean multiple) {
@@ -152,6 +170,12 @@ public enum TrackFileFormat {
         public String getExtension() {
             return "kmz";
         }
+
+        @Override
+        public boolean includesPhotos() {
+            return exportPhotos;
+        }
+
     },
     GPX {
         @Override
@@ -205,6 +229,13 @@ public enum TrackFileFormat {
      */
     public abstract String getExtension();
 
+    /**
+     * Returns whether the format supports photos.
+     */
+    public boolean includesPhotos() {
+        return false;
+    }
+
     /**
      * Returns the name of for each format.
      */

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

@@ -28,11 +28,10 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.OutputStream;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 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.io.file.TrackFileFormat;
-import de.dennisguse.opentracks.util.PreferencesUtils;
 import de.dennisguse.opentracks.util.SystemUtils;
 
 /**
@@ -51,10 +50,10 @@ public class ExportAsyncTask extends AsyncTask<Void, Integer, Boolean> {
     private ExportActivity exportActivity;
     private WakeLock wakeLock;
 
-    private boolean completed;
+    private boolean completed = false;
 
-    private int processedTrackCount;
-    private int totalTrackCount;
+    private int processedTrackCount = 0;
+    private int totalTrackCount = 0;
 
     /**
      * Creates an AsyncTask.
@@ -69,10 +68,6 @@ public class ExportAsyncTask extends AsyncTask<Void, Integer, Boolean> {
         this.directory = directory;
         context = exportActivity.getApplicationContext();
         contentProviderUtils = new ContentProviderUtils(context);
-
-        completed = false;
-        processedTrackCount = 0;
-        totalTrackCount = 0;
     }
 
     /**
@@ -98,17 +93,12 @@ public class ExportAsyncTask extends AsyncTask<Void, Integer, Boolean> {
     protected Boolean doInBackground(Void... params) {
         try {
             Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
-            boolean isRecording = PreferencesUtils.isRecording(exportActivity);
-            boolean isPaused = PreferencesUtils.isRecordingTrackPaused(exportActivity);
-            // Get the wake lock if not recording or paused
-            if (!isRecording || isPaused) {
-                wakeLock = SystemUtils.acquireWakeLock(exportActivity, wakeLock);
-            }
-            return saveAllTracks();
+
+            wakeLock = SystemUtils.acquireWakeLock(exportActivity, wakeLock);
+
+            return exportAllTracks();
         } finally {
-            if (wakeLock != null && wakeLock.isHeld()) {
-                wakeLock.release();
-            }
+            wakeLock = SystemUtils.releaseWakeLock(wakeLock);
         }
     }
 
@@ -136,15 +126,11 @@ public class ExportAsyncTask extends AsyncTask<Void, Integer, Boolean> {
     }
 
     /**
-     * Saves tracks to one file (uses first track to determine the filename).
+     * Export the track to one file.
      *
-     * @param tracks the tracks
+     * @param track the track
      */
-    private Boolean saveTracks(Track[] tracks) {
-        if (tracks.length == 0) {
-            return false;
-        }
-
+    private Boolean exportTrack(Track track) {
         TrackExporterListener trackExporterListener = new TrackExporterListener() {
             @Override
             public void onProgressUpdate(int number, int max) {
@@ -155,11 +141,15 @@ public class ExportAsyncTask extends AsyncTask<Void, Integer, Boolean> {
             }
         };
 
-        TrackExporter trackExporter = trackFileFormat.newTrackExporter(context, tracks, trackExporterListener);
-        Track track = tracks[0];
+        TrackExporter trackExporter = trackFileFormat.newTrackExporter(context, new Track[]{track}, trackExporterListener);
 
         String fileName = track.getId() + "." + trackFileFormat.getExtension();
-        DocumentFile file = directory.createFile(trackFileFormat.getMimeType(), fileName);
+
+        // 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);
+        if (file == null) {
+            file = directory.createFile(trackFileFormat.getMimeType(), fileName);
+        }
 
         try (OutputStream outputStream = context.getContentResolver().openOutputStream(file.getUri())) {
             if (trackExporter.writeTrack(context, outputStream)) {
@@ -183,7 +173,7 @@ public class ExportAsyncTask extends AsyncTask<Void, Integer, Boolean> {
     /**
      * Saves all the tracks.
      */
-    private Boolean saveAllTracks() {
+    private Boolean exportAllTracks() {
         try (Cursor cursor = contentProviderUtils.getTrackCursor(null, null, TracksColumns._ID)) {
             if (cursor == null) {
                 return false;
@@ -195,7 +185,7 @@ public class ExportAsyncTask extends AsyncTask<Void, Integer, Boolean> {
                 }
                 cursor.moveToPosition(i);
                 Track track = contentProviderUtils.createTrack(cursor);
-                if (track != null && saveTracks(new Track[]{track})) {
+                if (track != null && exportTrack(track)) {
                     processedTrackCount++;
                 }
                 publishProgress(i + 1, totalTrackCount);

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

@@ -25,12 +25,12 @@ import androidx.annotation.NonNull;
 
 import java.io.OutputStream;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
-import de.dennisguse.opentracks.content.LocationFactory;
-import de.dennisguse.opentracks.content.LocationIterator;
 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.provider.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.TrackPointFactory;
+import de.dennisguse.opentracks.content.provider.TrackPointIterator;
 import de.dennisguse.opentracks.util.LocationUtils;
 
 /**
@@ -126,10 +126,10 @@ public class FileTrackExporter implements TrackExporter {
         boolean wroteTrack = false;
         boolean wroteSegment = false;
         boolean isLastLocationValid = false;
-        TrackWriterLocationFactory locationFactory = new TrackWriterLocationFactory();
+        TrackWriterTrackPointFactory trackPointFactory = new TrackWriterTrackPointFactory();
         int locationNumber = 0;
 
-        try (LocationIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(track.getId(), -1L, false, locationFactory)) {
+        try (TrackPointIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(track.getId(), -1L, false, trackPointFactory)) {
 
             while (locationIterator.hasNext()) {
                 if (Thread.interrupted()) {
@@ -144,7 +144,7 @@ public class FileTrackExporter implements TrackExporter {
                 boolean isSegmentValid = isLocationValid && isLastLocationValid;
                 if (!wroteTrack && isSegmentValid) {
                     // Found the first two consecutive locations that are valid
-                    trackWriter.writeBeginTrack(track, locationFactory.lastLocation);
+                    trackWriter.writeBeginTrack(track, trackPointFactory.lastLocation);
                     wroteTrack = true;
                 }
 
@@ -155,7 +155,7 @@ public class FileTrackExporter implements TrackExporter {
                         wroteSegment = true;
 
                         // Write the previous location, which we had previously skipped
-                        trackWriter.writeLocation(locationFactory.lastLocation);
+                        trackWriter.writeLocation(trackPointFactory.lastLocation);
                     }
 
                     // Write the current location
@@ -169,7 +169,7 @@ public class FileTrackExporter implements TrackExporter {
                         wroteSegment = false;
                     }
                 }
-                locationFactory.swapLocations();
+                trackPointFactory.swapLocations();
                 isLastLocationValid = isLocationValid;
             }
 
@@ -207,12 +207,12 @@ public class FileTrackExporter implements TrackExporter {
      *
      * @author Jimmy Shih
      */
-    private class TrackWriterLocationFactory extends LocationFactory {
-        Location currentLocation;
-        Location lastLocation;
+    private class TrackWriterTrackPointFactory extends TrackPointFactory {
+        TrackPoint currentLocation;
+        TrackPoint lastLocation;
 
         @Override
-        public Location createLocation() {
+        public TrackPoint createLocation() {
             if (currentLocation == null) {
                 currentLocation = new TrackPoint("");
             }
@@ -220,7 +220,7 @@ public class FileTrackExporter implements TrackExporter {
         }
 
         void swapLocations() {
-            Location tempLocation = lastLocation;
+            TrackPoint tempLocation = lastLocation;
             lastLocation = currentLocation;
             currentLocation = tempLocation;
             if (currentLocation != null) {

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

@@ -26,11 +26,11 @@ import java.util.ArrayList;
 import java.util.List;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.DescriptionGenerator;
 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.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
 import de.dennisguse.opentracks.util.StringUtils;
 
@@ -65,9 +65,9 @@ public class KmlTrackWriter implements TrackWriter {
     private final ContentProviderUtils contentProviderUtils;
 
     private PrintWriter printWriter;
-    private List<Float> powerList = new ArrayList<>();
-    private List<Float> cadenceList = new ArrayList<>();
-    private List<Float> heartRateList = new ArrayList<>();
+    private final List<Float> powerList = new ArrayList<>();
+    private final List<Float> cadenceList = new ArrayList<>();
+    private final List<Float> heartRateList = new ArrayList<>();
 
     private Location startLocation;
 
@@ -164,7 +164,7 @@ public class KmlTrackWriter implements TrackWriter {
         if (printWriter != null && exportTrackDetail) {
             if (waypoint.hasPhoto() && exportPhotos) {
                 float heading = getHeading(waypoint.getTrackId(), waypoint.getLocation());
-                writePhotoOverlay(waypoint.getName(), waypoint.getCategory(), waypoint.getDescription(), WAYPOINT_STYLE, waypoint.getLocation(), waypoint.getPhotoUrl(), heading);
+                writePhotoOverlay(waypoint.getName(), waypoint.getCategory(), waypoint.getDescription(), waypoint.getLocation(), waypoint.getPhotoUrl(), heading);
             } else {
                 writePlacemark(waypoint.getName(), waypoint.getCategory(), waypoint.getDescription(), WAYPOINT_STYLE, waypoint.getLocation());
             }
@@ -321,16 +321,14 @@ public class KmlTrackWriter implements TrackWriter {
 
     /**
      * Writes a photo overlay.
-     *
-     * @param name        the name
+     *  @param name        the name
      * @param category    the category
      * @param description the description
-     * @param styleName   the style name
      * @param location    the location
      * @param photoUrl    the photo url
      * @param heading     the heading
      */
-    private void writePhotoOverlay(String name, String category, String description, String styleName, Location location, String photoUrl, float heading) {
+    private void writePhotoOverlay(String name, String category, String description, Location location, String photoUrl, float heading) {
         if (location != null && exportTrackDetail) {
             printWriter.println("<PhotoOverlay>");
             printWriter.println("<name>" + StringUtils.formatCData(name) + "</name>");
@@ -343,7 +341,7 @@ public class KmlTrackWriter implements TrackWriter {
             printWriter.print("<tilt>90</tilt>");
             printWriter.println("</Camera>");
             printWriter.println("<TimeStamp><when>" + getTime(location) + "</when></TimeStamp>");
-            printWriter.println("<styleUrl>#" + styleName + "</styleUrl>");
+            printWriter.println("<styleUrl>#" + KmlTrackWriter.WAYPOINT_STYLE + "</styleUrl>");
             writeCategory(category);
 
             if (exportPhotos) {

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

@@ -31,9 +31,9 @@ import java.io.OutputStream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 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.util.FileUtils;
 
 /**
@@ -52,7 +52,7 @@ public class KmzTrackExporter implements TrackExporter {
     private final TrackExporter fileTrackExporter;
     private final Track[] tracks;
 
-    private boolean exportPhotos;
+    private final boolean exportPhotos;
 
     /**
      * Constructor.

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

@@ -38,12 +38,12 @@ import javax.xml.parsers.SAXParser;
 import javax.xml.parsers.SAXParserFactory;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
-import de.dennisguse.opentracks.content.LocationFactory;
-import de.dennisguse.opentracks.content.LocationIterator;
 import de.dennisguse.opentracks.content.data.Track;
+import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.data.Waypoint;
-import de.dennisguse.opentracks.services.TrackRecordingService;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.TrackPointFactory;
+import de.dennisguse.opentracks.content.provider.TrackPointIterator;
 import de.dennisguse.opentracks.stats.TripStatisticsUpdater;
 import de.dennisguse.opentracks.util.FileUtils;
 import de.dennisguse.opentracks.util.LocationUtils;
@@ -160,9 +160,10 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
         Waypoint waypoint = null;
         Location location = null;
         TripStatisticsUpdater trackTripStatisticstrackUpdater = new TripStatisticsUpdater(track.getTripStatistics().getStartTime());
-        TripStatisticsUpdater markerTripStatisticsUpdater = new TripStatisticsUpdater(track.getTripStatistics().getStartTime());
+        @Deprecated // TODO Should not be necessary anymore?
+                TripStatisticsUpdater markerTripStatisticsUpdater = new TripStatisticsUpdater(track.getTripStatistics().getStartTime());
 
-        try (LocationIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(track.getId(), -1L, false, LocationFactory.DEFAULT_LOCATION_FACTORY)) {
+        try (TrackPointIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(track.getId(), -1L, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY)) {
 
             while (true) {
                 if (waypoint == null) {
@@ -273,7 +274,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
 
         //If not the first segment, add a pause separator if there is at least one location in the last segment.
         if (trackData.numberOfSegments > 1 && trackData.lastLocationInCurrentSegment != null) {
-            insertLocation(createLocation(TrackRecordingService.PAUSE_LATITUDE, 0.0, 0.0, trackData.lastLocationInCurrentSegment.getTime()));
+            insertLocation(createLocation(TrackPointsColumns.PAUSE_LATITUDE, 0.0, 0.0, trackData.lastLocationInCurrentSegment.getTime()));
         }
         trackData.lastLocationInCurrentSegment = null;
     }
@@ -343,8 +344,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
 
         if (trackData.numberOfSegments > 1 && trackData.lastLocationInCurrentSegment == null) {
             // If not the first segment, add a resume separator before adding the first location.
-            insertLocation(
-                    createLocation(TrackRecordingService.RESUME_LATITUDE, 0.0, 0.0, location.getTime()));
+            insertLocation(createLocation(TrackPointsColumns.RESUME_LATITUDE, 0.0, 0.0, location.getTime()));
         }
         trackData.lastLocationInCurrentSegment = location;
         return location;
@@ -411,7 +411,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
             timeValue = trackData.importTime;
         } else {
             try {
-                timeValue = StringUtils.getTime(time);
+                timeValue = StringUtils.parseTime(time);
             } catch (IllegalArgumentException e) {
                 throw new SAXException(createErrorMessage(String.format(Locale.US, "Unable to parse time: %s", time)), e);
             }
@@ -493,7 +493,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
     // TODO Why private inner class?
     private class TrackData {
         // The current track
-        Track track = new Track();
+        final Track track = new Track();
 
         // The number of segments processed for the current track
         int numberOfSegments = 0;
@@ -508,10 +508,10 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
         TripStatisticsUpdater tripStatisticsUpdater;
 
         // The import time of the track.
-        long importTime = System.currentTimeMillis();
+        final long importTime = System.currentTimeMillis();
 
         // The buffered locations
-        Location[] bufferedLocations = new Location[MAX_BUFFERED_LOCATIONS];
+        final Location[] bufferedLocations = new Location[MAX_BUFFERED_LOCATIONS];
 
         // The number of buffered locations
         int numBufferedLocations = 0;

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

@@ -24,7 +24,7 @@ import androidx.annotation.VisibleForTesting;
 import org.xml.sax.Attributes;
 import org.xml.sax.SAXException;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 
 /**
  * Imports a GPX file.

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

@@ -29,8 +29,8 @@ import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.Track;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
 import de.dennisguse.opentracks.util.FileUtils;
 import de.dennisguse.opentracks.util.PreferencesUtils;

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

@@ -28,8 +28,8 @@ import org.xml.sax.SAXException;
 
 import java.util.ArrayList;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.TrackPoint;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
 import de.dennisguse.opentracks.io.file.exporter.KmlTrackWriter;
 

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

@@ -28,7 +28,7 @@ import java.io.InputStream;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.io.file.exporter.KmzTrackExporter;
 import de.dennisguse.opentracks.util.FileUtils;
 import de.dennisguse.opentracks.util.PreferencesUtils;

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

@@ -1,67 +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.services;
-
-import android.annotation.SuppressLint;
-import android.content.Context;
-import android.location.LocationListener;
-import android.location.LocationManager;
-import android.os.Handler;
-import android.os.Looper;
-
-/**
- * Handles connection to {@link LocationManager}.
- *
- * @author Jimmy Shih
- */
-public class LocationManagerConnector {
-
-    private final Handler handler;
-    private final LocationManager locationManager;
-
-    public LocationManagerConnector(Context context, Looper looper) {
-        this.handler = new Handler(looper);
-
-        locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
-    }
-
-    /**
-     * Requests location updates.
-     *
-     * @param minTime          the minimal time
-     * @param minDistance      the minimal distance
-     * @param locationListener the location listener
-     */
-    public void requestLocationUpdates(final long minTime, final float minDistance, final LocationListener locationListener) {
-        handler.post(new Runnable() {
-            @Override
-            @SuppressLint("MissingPermission")
-            public void run() {
-                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, minTime, minDistance, locationListener);
-            }
-        });
-    }
-
-    /**
-     * Removes location updates.
-     *
-     * @param locationListener the location listener
-     */
-    public void removeLocationUpdates(final LocationListener locationListener) {
-        locationManager.removeUpdates(locationListener);
-    }
-}

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

@@ -18,6 +18,7 @@ package de.dennisguse.opentracks.services;
 
 import android.app.PendingIntent;
 import android.app.Service;
+import android.content.ContentUris;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -28,12 +29,10 @@ import android.location.LocationListener;
 import android.location.LocationManager;
 import android.net.Uri;
 import android.os.Bundle;
-import android.os.Handler;
 import android.os.IBinder;
 import android.os.PowerManager.WakeLock;
 import android.util.Log;
 
-import androidx.annotation.VisibleForTesting;
 import androidx.core.app.TaskStackBuilder;
 
 import java.util.concurrent.ExecutorService;
@@ -42,13 +41,14 @@ import java.util.concurrent.Executors;
 import de.dennisguse.opentracks.R;
 import de.dennisguse.opentracks.TrackDetailActivity;
 import de.dennisguse.opentracks.TrackListActivity;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
-import de.dennisguse.opentracks.content.CustomContentProvider;
-import de.dennisguse.opentracks.content.LocationFactory;
-import de.dennisguse.opentracks.content.LocationIterator;
 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.data.Waypoint;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.CustomContentProvider;
+import de.dennisguse.opentracks.content.provider.TrackPointFactory;
+import de.dennisguse.opentracks.content.provider.TrackPointIterator;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
 import de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager;
 import de.dennisguse.opentracks.services.tasks.AnnouncementPeriodicTaskFactory;
@@ -71,35 +71,26 @@ import de.dennisguse.opentracks.util.UnitConversions;
  */
 public class TrackRecordingService extends Service {
 
-    private static final int NOTIFICATION_ID = 123;
-
-    public static final double PAUSE_LATITUDE = 100.0;
-    public static final double RESUME_LATITUDE = 200.0;
-
     // Anything faster than that (in meters per second) will be considered moving.
-    public static final double MAX_NO_MOVEMENT_SPEED = 0.224;
     private static final String TAG = TrackRecordingService.class.getSimpleName();
-    // 1 minute in milliseconds
-    private static final long ONE_MINUTE = (long) (UnitConversions.MIN_TO_S * UnitConversions.S_TO_MS);
+
+    public static final double MAX_NO_MOVEMENT_SPEED = 0.224;
+
     // The following variables are set in onCreate:
     private ExecutorService executorService;
     private ContentProviderUtils contentProviderUtils;
-    private Handler handler;
-    private LocationManagerConnector locationManagerConnector;
+    private LocationManager locationManager;
     private PeriodicTaskExecutor voiceExecutor;
-    private SharedPreferences sharedPreferences;
     private TrackRecordingServiceNotificationManager notificationManager;
+    private LocationListenerPolicy locationListenerPolicy;
+
     private long recordingTrackId;
     private boolean recordingTrackPaused;
-    private LocationListenerPolicy locationListenerPolicy;
     private int recordingDistanceInterval;
     private int maxRecordingDistance;
     private int recordingGpsAccuracy;
     private long currentRecordingInterval;
 
-    // The following variables are set when recording:
-    private TripStatisticsUpdater trackTripStatisticsUpdater;
-    // Note that sharedPreferenceChangeListener cannot be an anonymous inner class; anonymous inner class will get garbage collected.
     private final OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new OnSharedPreferenceChangeListener() {
         @Override
         public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
@@ -124,12 +115,12 @@ public class TrackRecordingService extends Service {
                 int minRecordingInterval = PreferencesUtils.getMinRecordingInterval(context);
                 if (minRecordingInterval == PreferencesUtils.getMinRecordingIntervalAdaptBatteryLife(context)) {
                     // Choose battery life over moving time accuracy.
-                    locationListenerPolicy = new AdaptiveLocationListenerPolicy(30 * UnitConversions.ONE_SECOND, 5 * ONE_MINUTE, 5);
+                    locationListenerPolicy = new AdaptiveLocationListenerPolicy(30 * UnitConversions.ONE_SECOND_MS, 5 * UnitConversions.ONE_MINUTE_MS, 5);
                 } else if (minRecordingInterval == PreferencesUtils.getMinRecordingIntervalAdaptAccuracy(context)) {
                     // Get all the updates.
-                    locationListenerPolicy = new AdaptiveLocationListenerPolicy(UnitConversions.ONE_SECOND, 30 * UnitConversions.ONE_SECOND, 0);
+                    locationListenerPolicy = new AdaptiveLocationListenerPolicy(UnitConversions.ONE_SECOND_MS, 30 * UnitConversions.ONE_SECOND_MS, 0);
                 } else {
-                    locationListenerPolicy = new AbsoluteLocationListenerPolicy(minRecordingInterval * UnitConversions.ONE_SECOND);
+                    locationListenerPolicy = new AbsoluteLocationListenerPolicy(minRecordingInterval * UnitConversions.ONE_SECOND_MS);
                 }
             }
             if (PreferencesUtils.isKey(context, R.string.recording_distance_interval_key, key)) {
@@ -144,20 +135,21 @@ public class TrackRecordingService extends Service {
         }
     };
 
+    // The following variables are set when recording:
     private WakeLock wakeLock;
     private BluetoothRemoteSensorManager remoteSensorManager;
+
+    private TripStatisticsUpdater trackTripStatisticsUpdater;
     private Location lastLocation;
     private boolean currentSegmentHasLocation;
-    private boolean isIdle; // true if idle
-    private ServiceBinder binder = new ServiceBinder(this);
-    private LocationListener locationListener = new LocationListener() {
+    private boolean isIdle;
+
+    private TrackRecordingServiceBinder binder = new TrackRecordingServiceBinder(this);
+    private final LocationListener locationListener = new LocationListener() {
 
         @Override
         public void onLocationChanged(final Location location) {
-            if (locationManagerConnector == null
-                    || executorService == null
-                    || executorService.isShutdown()
-                    || executorService.isTerminated()) {
+            if (executorService == null || executorService.isShutdown() || executorService.isTerminated()) {
                 return;
             }
             executorService.submit(new Runnable() {
@@ -184,35 +176,21 @@ public class TrackRecordingService extends Service {
         }
     };
 
-    private final Runnable registerLocationRunnable = new Runnable() {
-        @Override
-        public void run() {
-            if (isRecording() && !isPaused()) {
-                registerLocationListener();
-            }
-            handler.postDelayed(this, ONE_MINUTE);
-        }
-    };
-
     @Override
     public void onCreate() {
         super.onCreate();
         executorService = Executors.newSingleThreadExecutor();
         contentProviderUtils = new ContentProviderUtils(this);
-        handler = new Handler();
-        locationManagerConnector = new LocationManagerConnector(this, handler.getLooper());
+        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
         voiceExecutor = new PeriodicTaskExecutor(this, new AnnouncementPeriodicTaskFactory());
-        sharedPreferences = PreferencesUtils.getSharedPreferences(this);
-        sharedPreferences.registerOnSharedPreferenceChangeListener(sharedPreferenceChangeListener);
+
         notificationManager = new TrackRecordingServiceNotificationManager(this);
 
         // onSharedPreferenceChanged might not set recordingTrackId.
         recordingTrackId = PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
 
-        // Require voiceExecutor and splitExecutor to be created.
-        sharedPreferenceChangeListener.onSharedPreferenceChanged(sharedPreferences, null);
-
-        handler.post(registerLocationRunnable);
+        PreferencesUtils.register(this, sharedPreferenceChangeListener);
+        sharedPreferenceChangeListener.onSharedPreferenceChanged(null, null);
 
         // Try to restart the previous recording track in case the service has been restarted by the system, which can sometimes happen.
         Track track = contentProviderUtils.getTrack(recordingTrackId);
@@ -247,11 +225,10 @@ public class TrackRecordingService extends Service {
         // Reverse order from onCreate
         showNotification(false); //TODO Why?
 
-        handler.removeCallbacks(registerLocationRunnable);
         unregisterLocationListener();
+        locationManager = null;
 
-        // unregister sharedPreferences before shutting down splitExecutor and voiceExecutor
-        sharedPreferences.unregisterOnSharedPreferenceChangeListener(sharedPreferenceChangeListener);
+        PreferencesUtils.unregister(this, sharedPreferenceChangeListener);
 
         try {
             voiceExecutor.shutdown();
@@ -259,14 +236,13 @@ public class TrackRecordingService extends Service {
             voiceExecutor = null;
         }
 
-        locationManagerConnector = null;
         contentProviderUtils = null;
 
         binder.detachFromService();
         binder = null;
 
         // This should be the next to last operation
-        releaseWakeLock();
+        wakeLock = SystemUtils.releaseWakeLock(wakeLock);
 
         // Shutdown the executorService last to avoid sending events to a dead executor.
         executorService.shutdown();
@@ -281,6 +257,10 @@ public class TrackRecordingService extends Service {
         return recordingTrackPaused;
     }
 
+    public long getRecordingTrackId() {
+        return recordingTrackId;
+    }
+
     public TripStatistics getTripStatistics() {
         if (trackTripStatisticsUpdater == null) {
             return null;
@@ -288,6 +268,16 @@ public class TrackRecordingService extends Service {
         return trackTripStatisticsUpdater.getTripStatistics();
     }
 
+    public long getTotalTime() {
+        if (trackTripStatisticsUpdater == null) {
+            return 0;
+        }
+        if (!isPaused()) {
+            trackTripStatisticsUpdater.updateTime(System.currentTimeMillis());
+        }
+        return trackTripStatisticsUpdater.getTripStatistics().getTotalTime();
+    }
+
     /**
      * Inserts a waypoint.
      *
@@ -324,7 +314,7 @@ public class TrackRecordingService extends Service {
         // Insert waypoint
         Waypoint waypoint = new Waypoint(name, description, category, icon, recordingTrackId, length, duration, location, photoUrl);
         Uri uri = contentProviderUtils.insertWaypoint(waypoint);
-        return Long.parseLong(uri.getLastPathSegment());
+        return ContentUris.parseId(uri);
     }
 
     /**
@@ -332,7 +322,7 @@ public class TrackRecordingService extends Service {
      *
      * @return the track id
      */
-    private long startNewTrack() {
+    long startNewTrack() {
         if (isRecording()) {
             Log.d(TAG, "Ignore startNewTrack. Already recording.");
             return -1L;
@@ -343,7 +333,7 @@ public class TrackRecordingService extends Service {
         // Insert a track
         Track track = new Track();
         Uri uri = contentProviderUtils.insertTrack(track);
-        long trackId = Long.parseLong(uri.getLastPathSegment());
+        long trackId = ContentUris.parseId(uri);
 
         // Update shared preferences
         updateRecordingState(trackId, false);
@@ -358,37 +348,25 @@ public class TrackRecordingService extends Service {
         track.setTripStatistics(trackTripStatisticsUpdater.getTripStatistics());
         contentProviderUtils.updateTrack(track);
 
-        startRecording(true);
+        startRecording();
         return trackId;
     }
 
-    /**
-     * Restart a track.
-     *
-     * @param track the track
-     */
     private void restartTrack(Track track) {
         Log.d(TAG, "Restarting track: " + track.getId());
 
         TripStatistics tripStatistics = track.getTripStatistics();
         trackTripStatisticsUpdater = new TripStatisticsUpdater(tripStatistics.getStartTime());
 
-        try (LocationIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(track.getId(), -1L, false, LocationFactory.DEFAULT_LOCATION_FACTORY)) {
-
-            while (locationIterator.hasNext()) {
-                Location location = locationIterator.next();
-                trackTripStatisticsUpdater.addLocation(location, recordingDistanceInterval);
-            }
+        try (TrackPointIterator locationIterator = contentProviderUtils.getTrackPointLocationIterator(track.getId(), -1L, false, TrackPointFactory.DEFAULT_LOCATION_FACTORY)) {
+            trackTripStatisticsUpdater.addLocation(locationIterator, recordingDistanceInterval);
         } catch (RuntimeException e) {
             Log.e(TAG, "RuntimeException", e);
         }
-        startRecording(true);
+        startRecording();
     }
 
-    /**
-     * Resumes current track.
-     */
-    private void resumeCurrentTrack() {
+    void resumeCurrentTrack() {
         if (!isRecording() || !isPaused()) {
             Log.d(TAG, "Ignore resumeCurrentTrack. Not recording or not paused.");
             return;
@@ -403,20 +381,18 @@ public class TrackRecordingService extends Service {
         if (track != null) {
             Location resume = new Location(LocationManager.GPS_PROVIDER);
             resume.setLongitude(0);
-            resume.setLatitude(RESUME_LATITUDE);
+            resume.setLatitude(TrackPointsColumns.RESUME_LATITUDE);
             resume.setTime(System.currentTimeMillis());
             insertLocation(track, resume, null);
         }
 
-        startRecording(false);
+        startRecording();
     }
 
     /**
      * Common code for starting a new track, resuming a track, or restarting after phone reboot.
-     *
-     * @param trackStarted true if track is started, false if track is resumed
      */
-    private void startRecording(boolean trackStarted) {
+    private void startRecording() {
         // Update instance variables
         remoteSensorManager = new BluetoothRemoteSensorManager(this);
         remoteSensorManager.start();
@@ -430,19 +406,19 @@ public class TrackRecordingService extends Service {
         voiceExecutor.restore();
     }
 
-    /**
-     * Starts gps.
-     */
+    void tryStartGps() {
+        if (isRecording()) return;
+
+        startGps();
+    }
+
     private void startGps() {
         wakeLock = SystemUtils.acquireWakeLock(this, wakeLock);
         registerLocationListener();
         showNotification(true);
     }
 
-    /**
-     * Ends the current track.
-     */
-    private void endCurrentTrack() {
+    void endCurrentTrack() {
         if (!isRecording()) {
             Log.d(TAG, "Ignore endCurrentTrack. Not recording.");
             return;
@@ -475,10 +451,7 @@ public class TrackRecordingService extends Service {
         endRecording(true);
     }
 
-    /**
-     * Pauses the current track.
-     */
-    private void pauseCurrentTrack() {
+    void pauseCurrentTrack() {
         if (!isRecording() || isPaused()) {
             Log.d(TAG, "Ignore pauseCurrentTrack. Not recording or paused.");
             return;
@@ -495,7 +468,7 @@ public class TrackRecordingService extends Service {
 
             Location pause = new Location(LocationManager.GPS_PROVIDER);
             pause.setLongitude(0);
-            pause.setLatitude(PAUSE_LATITUDE);
+            pause.setLatitude(TrackPointsColumns.PAUSE_LATITUDE);
             pause.setTime(System.currentTimeMillis());
             insertLocation(track, pause, null);
         }
@@ -527,13 +500,15 @@ public class TrackRecordingService extends Service {
     /**
      * Stops gps.
      *
-     * @param stop true to stop self
+     * @param shutdown true to shutdown self
      */
-    private void stopGps(boolean stop) {
+    void stopGps(boolean shutdown) {
+        if (!isRecording()) return;
+
         unregisterLocationListener();
         showNotification(false);
-        releaseWakeLock();
-        if (stop) {
+        wakeLock = SystemUtils.releaseWakeLock(wakeLock);
+        if (shutdown) {
             stopSelf();
         }
     }
@@ -564,107 +539,94 @@ public class TrackRecordingService extends Service {
         PreferencesUtils.setBoolean(this, R.string.recording_track_paused_key, recordingTrackPaused);
     }
 
-    /**
-     * Called when location changed.
-     *
-     * @param location the location
-     */
-    private void onLocationChangedAsync(Location location) {
-        try {
-            if (!isRecording() || isPaused()) {
-                Log.w(TAG, "Ignore onLocationChangedAsync. Not recording or paused.");
-                return;
-            }
-
-            Track track = contentProviderUtils.getTrack(recordingTrackId);
-            if (track == null) {
-                Log.w(TAG, "Ignore onLocationChangedAsync. No track.");
-                return;
-            }
-
-            if (!LocationUtils.isValidLocation(location)) {
-                Log.w(TAG, "Ignore onLocationChangedAsync. location is invalid.");
-                return;
-            }
-
-            notificationManager.updateLocation(this, location, recordingGpsAccuracy);
-
-            if (!location.hasAccuracy() || location.getAccuracy() >= recordingGpsAccuracy) {
-                Log.d(TAG, "Ignore onLocationChangedAsync. Poor accuracy.");
-                return;
-            }
-
-            //TODO Necessary?
-            // Fix for phones that do not set the time field
-            if (location.getTime() == 0L) {
-                location.setTime(System.currentTimeMillis());
-            }
-
-            Location lastValidTrackPoint = getLastValidTrackPointInCurrentSegment(track.getId());
-            long idleTime = 0L;
-            if (lastValidTrackPoint != null && location.getTime() > lastValidTrackPoint.getTime()) {
-                idleTime = location.getTime() - lastValidTrackPoint.getTime();
-            }
-            locationListenerPolicy.updateIdleTime(idleTime);
-            if (currentRecordingInterval != locationListenerPolicy.getDesiredPollingInterval()) {
-                registerLocationListener();
-            }
-
-            SensorDataSet sensorDataSet = getSensorDataSet();
-            if (sensorDataSet != null) {
-                location = new TrackPoint(location, sensorDataSet);
-            }
-
-            // Always insert the first segment location
-            if (!currentSegmentHasLocation) {
-                insertLocation(track, location, null);
-                currentSegmentHasLocation = true;
-                lastLocation = location;
-                return;
-            }
-
-            if (!LocationUtils.isValidLocation(lastValidTrackPoint)) {
-                // Should not happen. The current segment should have a location. Just insert the current location.
-                insertLocation(track, location, null);
-                lastLocation = location;
-                return;
-            }
-
-            double distanceToLastTrackLocation = location.distanceTo(lastValidTrackPoint);
-            if (distanceToLastTrackLocation > maxRecordingDistance) {
-                insertLocation(track, lastLocation, lastValidTrackPoint);
-
-                Location pause = new Location(LocationManager.GPS_PROVIDER);
-                pause.setLongitude(0);
-                pause.setLatitude(PAUSE_LATITUDE);
-                pause.setTime(lastLocation.getTime());
-                insertLocation(track, pause, null);
-
-                insertLocation(track, location, null);
-                isIdle = false;
-            } else if (sensorDataSet != null || distanceToLastTrackLocation >= recordingDistanceInterval) {
-                insertLocation(track, lastLocation, lastValidTrackPoint);
-                insertLocation(track, location, null);
-                isIdle = false;
-            } else if (!isIdle && location.hasSpeed() && location.getSpeed() < MAX_NO_MOVEMENT_SPEED) {
-                insertLocation(track, lastLocation, lastValidTrackPoint);
-                insertLocation(track, location, null);
-                isIdle = true;
-            } else if (isIdle && location.hasSpeed() && location.getSpeed() >= MAX_NO_MOVEMENT_SPEED) {
-                insertLocation(track, lastLocation, lastValidTrackPoint);
-                insertLocation(track, location, null);
-                isIdle = false;
-            } else {
-                Log.d(TAG, "Not recording location, idle");
-            }
-            lastLocation = location;
-        } catch (Error e) {
-            Log.e(TAG, "Error in onLocationChangedAsync", e);
-            throw e;
-        } catch (RuntimeException e) {
-            Log.e(TAG, "RuntimeException in onLocationChangedAsync", e);
-            throw e;
+    void onLocationChangedAsync(Location location) {
+        if (!isRecording() || isPaused()) {
+            Log.w(TAG, "Ignore onLocationChangedAsync. Not recording or paused.");
+            return;
         }
+
+        Track track = contentProviderUtils.getTrack(recordingTrackId);
+        if (track == null) {
+            Log.w(TAG, "Ignore onLocationChangedAsync. No track.");
+            return;
+        }
+
+        if (!LocationUtils.isValidLocation(location)) {
+            Log.w(TAG, "Ignore onLocationChangedAsync. location is invalid.");
+            return;
+        }
+
+        notificationManager.updateLocation(this, location, recordingGpsAccuracy);
+
+        if (!location.hasAccuracy() || location.getAccuracy() >= recordingGpsAccuracy) {
+            Log.d(TAG, "Ignore onLocationChangedAsync. Poor accuracy.");
+            return;
+        }
+
+        //TODO Necessary?
+        // Fix for phones that do not set the time field
+        if (location.getTime() == 0L) {
+            location.setTime(System.currentTimeMillis());
+        }
+
+        Location lastValidTrackPoint = getLastValidTrackPointInCurrentSegment(track.getId());
+        long idleTime = 0L;
+        if (lastValidTrackPoint != null && location.getTime() > lastValidTrackPoint.getTime()) {
+            idleTime = location.getTime() - lastValidTrackPoint.getTime();
+        }
+        locationListenerPolicy.updateIdleTime(idleTime);
+        if (currentRecordingInterval != locationListenerPolicy.getDesiredPollingInterval()) {
+            registerLocationListener();
+        }
+
+        SensorDataSet sensorDataSet = getSensorDataSet();
+        if (sensorDataSet != null) {
+            location = new TrackPoint(location, sensorDataSet);
+        }
+
+        // Always insert the first segment location
+        if (!currentSegmentHasLocation) {
+            insertLocation(track, location, null);
+            currentSegmentHasLocation = true;
+            lastLocation = location;
+            return;
+        }
+
+        if (!LocationUtils.isValidLocation(lastValidTrackPoint)) {
+            // Should not happen. The current segment should have a location. Just insert the current location.
+            insertLocation(track, location, null);
+            lastLocation = location;
+            return;
+        }
+
+        double distanceToLastTrackLocation = location.distanceTo(lastValidTrackPoint);
+        if (distanceToLastTrackLocation > maxRecordingDistance) {
+            insertLocation(track, lastLocation, lastValidTrackPoint);
+
+            Location pause = new Location(LocationManager.GPS_PROVIDER);
+            pause.setLongitude(0);
+            pause.setLatitude(TrackPointsColumns.PAUSE_LATITUDE);
+            pause.setTime(lastLocation.getTime());
+            insertLocation(track, pause, null);
+
+            insertLocation(track, location, null);
+            isIdle = false;
+        } else if (sensorDataSet != null || distanceToLastTrackLocation >= recordingDistanceInterval) {
+            insertLocation(track, lastLocation, lastValidTrackPoint);
+            insertLocation(track, location, null);
+            isIdle = false;
+        } else if (!isIdle && location.hasSpeed() && location.getSpeed() < MAX_NO_MOVEMENT_SPEED) {
+            insertLocation(track, lastLocation, lastValidTrackPoint);
+            insertLocation(track, location, null);
+            isIdle = true;
+        } else if (isIdle && location.hasSpeed() && location.getSpeed() >= MAX_NO_MOVEMENT_SPEED) {
+            insertLocation(track, lastLocation, lastValidTrackPoint);
+            insertLocation(track, location, null);
+            isIdle = false;
+        } else {
+            Log.d(TAG, "Not recording location, idle");
+        }
+        lastLocation = location;
     }
 
     /**
@@ -686,7 +648,7 @@ public class TrackRecordingService extends Service {
         }
 
         try {
-            Uri uri = contentProviderUtils.insertTrackPoint(location, track.getId());
+            contentProviderUtils.insertTrackPoint(location, track.getId());
             trackTripStatisticsUpdater.addLocation(location, recordingDistanceInterval);
             updateRecordingTrack(track, LocationUtils.isValidLocation(location));
         } catch (SQLiteException e) {
@@ -700,7 +662,7 @@ public class TrackRecordingService extends Service {
     }
 
     /**
-     * Updates the recording track time as well as the startId and the stopId.
+     * Updates the recording track time.
      * Increase the number of points if it is a new and valid track point.
      *
      * @param track                  the track
@@ -716,57 +678,37 @@ public class TrackRecordingService extends Service {
         contentProviderUtils.updateTrack(track);
     }
 
-    private SensorDataSet getSensorDataSet() {
+    SensorDataSet getSensorDataSet() {
         if (remoteSensorManager == null || !remoteSensorManager.isEnabled() || !remoteSensorManager.isSensorDataSetValid()) {
             return null;
         }
         return remoteSensorManager.getSensorDataSet();
     }
 
-    /**
-     * Registers the location listener.
-     */
     private void registerLocationListener() {
-        if (locationManagerConnector == null) {
+        if (locationManager == null) {
             Log.e(TAG, "locationManager is null.");
             return;
         }
         try {
             long interval = locationListenerPolicy.getDesiredPollingInterval();
-            locationManagerConnector.requestLocationUpdates(interval, locationListenerPolicy.getMinDistance_m(), locationListener);
+            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, interval, locationListenerPolicy.getMinDistance_m(), locationListener);
             currentRecordingInterval = interval;
-        } catch (RuntimeException e) {
-            Log.e(TAG, "Could not register location listener.", e);
+        } catch (SecurityException e) {
+            Log.e(TAG, "Could not register location listener; permissions not granted.", e);
         }
     }
 
-    /**
-     * Unregisters the location manager.
-     */
     private void unregisterLocationListener() {
-        if (locationManagerConnector == null) {
+        if (locationManager == null) {
             Log.e(TAG, "locationManager is null.");
             return;
         }
-        locationManagerConnector.removeLocationUpdates(locationListener);
-    }
-
-    /**
-     * Releases the wake lock.
-     */
-    private void releaseWakeLock() {
-        if (wakeLock != null && wakeLock.isHeld()) {
-            wakeLock.release();
-            wakeLock = null;
-        }
+        locationManager.removeUpdates(locationListener);
     }
 
     private void showNotification(boolean isGpsStarted) {
-        if ((isRecording() && isPaused()) || (!isRecording() && !isGpsStarted)) {
-            stopForeground(true);
-        }
-
-        if (isRecording() && !isPaused()) {
+        if (isRecording()) {
             Intent intent = IntentUtils.newIntent(this, TrackDetailActivity.class)
                     .putExtra(TrackDetailActivity.EXTRA_TRACK_ID, recordingTrackId);
             PendingIntent pendingIntent = TaskStackBuilder.create(this)
@@ -776,7 +718,7 @@ public class TrackRecordingService extends Service {
 
             notificationManager.updatePendingIntent(pendingIntent);
             notificationManager.updateContent(getString(R.string.gps_starting));
-            startForeground(NOTIFICATION_ID, notificationManager.getNotification());
+            startForeground(TrackRecordingServiceNotificationManager.NOTIFICATION_ID, notificationManager.getNotification());
         }
         if (!isRecording() && isGpsStarted) {
             Intent intent = IntentUtils.newIntent(this, TrackListActivity.class);
@@ -786,109 +728,11 @@ public class TrackRecordingService extends Service {
 
             notificationManager.updatePendingIntent(pendingIntent);
             notificationManager.updateContent(getString(R.string.gps_starting));
-
-            startForeground(NOTIFICATION_ID, notificationManager.getNotification());
+            startForeground(TrackRecordingServiceNotificationManager.NOTIFICATION_ID, notificationManager.getNotification());
         }
-    }
-
-    /**
-     * TODO: There is a bug in Android that leaks Binder instances. This bug is
-     * especially visible if we have a non-static class, as there is no way to
-     * nullify reference to the outer class (the service). A workaround is to use
-     * a static class and explicitly clear service and detach it from the
-     * underlying Binder. With this approach, we minimize the leak to 24 bytes per
-     * each service instance. For more details, see the following bug:
-     * http://code.google.com/p/android/issues/detail?id=6426.
-     */
-    private static class ServiceBinder extends android.os.Binder implements ITrackRecordingService {
-        private TrackRecordingService trackRecordingService;
-
-        public ServiceBinder(TrackRecordingService trackRecordingService) {
-            this.trackRecordingService = trackRecordingService;
-        }
-
-        @Override
-        public void startGps() {
-            if (!trackRecordingService.isRecording()) {
-                trackRecordingService.startGps();
-            }
-        }
-
-        public void stopGps() {
-            if (!trackRecordingService.isRecording()) {
-                trackRecordingService.stopGps(true);
-            }
-        }
-
-        @Override
-        public long startNewTrack() {
-            return trackRecordingService.startNewTrack();
-        }
-
-        @Override
-        public void pauseCurrentTrack() {
-            trackRecordingService.pauseCurrentTrack();
-        }
-
-        @Override
-        public void resumeCurrentTrack() {
-            trackRecordingService.resumeCurrentTrack();
-        }
-
-        @Override
-        public void endCurrentTrack() {
-            trackRecordingService.endCurrentTrack();
-        }
-
-        @Override
-        public boolean isRecording() {
-            return trackRecordingService.isRecording();
-        }
-
-        @Override
-        public boolean isPaused() {
-            return trackRecordingService.isPaused();
-        }
-
-        @Override
-        public long getRecordingTrackId() {
-            return trackRecordingService.recordingTrackId;
-        }
-
-        @Override
-        public long getTotalTime() {
-            TripStatisticsUpdater updater = trackRecordingService.trackTripStatisticsUpdater;
-            if (updater == null) {
-                return 0;
-            }
-            if (!trackRecordingService.isPaused()) {
-                updater.updateTime(System.currentTimeMillis());
-            }
-            return updater.getTripStatistics().getTotalTime();
-        }
-
-        @Override
-        public long insertWaypoint(String name, String category, String description, String photoUrl) {
-            return trackRecordingService.insertWaypoint(name, category, description, photoUrl);
-        }
-
-        @VisibleForTesting
-        @Override
-        public void insertTrackPoint(Location location) {
-            trackRecordingService.onLocationChangedAsync(location);
-        }
-
-        @Override
-        public SensorDataSet getSensorData() {
-            return trackRecordingService.getSensorDataSet();
-        }
-
-        /**
-         * Detaches from the track recording service. Clears the reference to the
-         * outer class to minimize the leak.
-         */
-        private void detachFromService() {
-            trackRecordingService = null;
+        if (!isRecording() && !isGpsStarted) {
+            stopForeground(true);
+            notificationManager.cancelNotification();
         }
     }
 }

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

@@ -0,0 +1,97 @@
+package de.dennisguse.opentracks.services;
+
+import android.location.Location;
+
+import androidx.annotation.VisibleForTesting;
+
+import de.dennisguse.opentracks.content.sensor.SensorDataSet;
+
+/**
+ * TODO: There is a bug in Android that leaks Binder instances. This bug is
+ * especially visible if we have a non-static class, as there is no way to
+ * nullify reference to the outer class (the service). A workaround is to use
+ * a static class and explicitly clear service and detach it from the
+ * underlying Binder. With this approach, we minimize the leak to 24 bytes per
+ * each service instance. For more details, see the following bug:
+ * http://code.google.com/p/android/issues/detail?id=6426.
+ */
+class TrackRecordingServiceBinder extends android.os.Binder implements TrackRecordingServiceInterface {
+    private TrackRecordingService trackRecordingService;
+
+    TrackRecordingServiceBinder(TrackRecordingService trackRecordingService) {
+        this.trackRecordingService = trackRecordingService;
+    }
+
+    @Override
+    public void startGps() {
+        trackRecordingService.tryStartGps();
+    }
+
+    public void stopGps() {
+        trackRecordingService.stopGps(true);
+    }
+
+    @Override
+    public long startNewTrack() {
+        return trackRecordingService.startNewTrack();
+    }
+
+    @Override
+    public void pauseCurrentTrack() {
+        trackRecordingService.pauseCurrentTrack();
+    }
+
+    @Override
+    public void resumeCurrentTrack() {
+        trackRecordingService.resumeCurrentTrack();
+    }
+
+    @Override
+    public void endCurrentTrack() {
+        trackRecordingService.endCurrentTrack();
+    }
+
+    @Override
+    public boolean isRecording() {
+        return trackRecordingService.isRecording();
+    }
+
+    @Override
+    public boolean isPaused() {
+        return trackRecordingService.isPaused();
+    }
+
+    @Override
+    public long getRecordingTrackId() {
+        return trackRecordingService.getRecordingTrackId();
+    }
+
+    @Override
+    public long getTotalTime() {
+        return trackRecordingService.getTotalTime();
+    }
+
+    @Override
+    public long insertWaypoint(String name, String category, String description, String photoUrl) {
+        return trackRecordingService.insertWaypoint(name, category, description, photoUrl);
+    }
+
+    @VisibleForTesting
+    @Override
+    public void insertTrackPoint(Location location) {
+        trackRecordingService.onLocationChangedAsync(location);
+    }
+
+    @Override
+    public SensorDataSet getSensorData() {
+        return trackRecordingService.getSensorDataSet();
+    }
+
+    /**
+     * Detaches from the track recording service. Clears the reference to the
+     * outer class to minimize the leak.
+     */
+    void detachFromService() {
+        trackRecordingService = null;
+    }
+}

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

@@ -49,7 +49,7 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
 
     private final Runnable callback;
 
-    private ITrackRecordingService trackRecordingService;
+    private TrackRecordingServiceInterface trackRecordingService;
 
     /**
      * Constructor.
@@ -86,7 +86,7 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
     /**
      * Gets the track recording service if bound. Returns null otherwise
      */
-    public ITrackRecordingService getServiceIfBound() {
+    public TrackRecordingServiceInterface getServiceIfBound() {
         return trackRecordingService;
     }
 
@@ -96,7 +96,7 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
      *
      * @param value the value
      */
-    private void setTrackRecordingService(ITrackRecordingService value) {
+    private void setTrackRecordingService(TrackRecordingServiceInterface value) {
         trackRecordingService = value;
         if (callback != null) {
             callback.run();
@@ -123,7 +123,7 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
         } catch (RemoteException e) {
             Log.e(TAG, "Failed to bind a death recipient.", e);
         }
-        setTrackRecordingService((ITrackRecordingService) service);
+        setTrackRecordingService((TrackRecordingServiceInterface) service);
     }
 
     @Override
@@ -180,7 +180,7 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
      * Resumes the recording track.
      */
     public void resumeTrack() {
-        ITrackRecordingService service = getServiceIfBound();
+        TrackRecordingServiceInterface service = getServiceIfBound();
         if (service != null) {
             service.resumeCurrentTrack();
         }
@@ -190,7 +190,7 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
      * Pauses the recording track.
      */
     public void pauseTrack() {
-        ITrackRecordingService service = getServiceIfBound();
+        TrackRecordingServiceInterface service = getServiceIfBound();
         if (service != null) {
             service.pauseCurrentTrack();
         }
@@ -212,7 +212,7 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
      * @return the id of the marker or -1L if none could be created.
      */
     public long addMarker(Context context, String name, String category, String description, String photoUrl) {
-        ITrackRecordingService trackRecordingService = getServiceIfBound();
+        TrackRecordingServiceInterface trackRecordingService = getServiceIfBound();
         if (trackRecordingService == null) {
             Log.d(TAG, "Unable to add marker, no track recording service");
         } else {
@@ -238,7 +238,7 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
      * @param showEditor true to show the editor
      */
     public void stopRecording(@NonNull Context context, boolean showEditor) {
-        ITrackRecordingService trackRecordingService = getServiceIfBound();
+        TrackRecordingServiceInterface trackRecordingService = getServiceIfBound();
         if (trackRecordingService == null) {
             resetRecordingState(context);
         } else {

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

@@ -25,7 +25,7 @@ import de.dennisguse.opentracks.content.sensor.SensorDataSet;
  * App's service.
  * This service is the process that actually records and manages tracks.
  */
-public interface ITrackRecordingService {
+public interface TrackRecordingServiceInterface {
 
     /**
      * Starts gps.

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

@@ -20,13 +20,13 @@ import de.dennisguse.opentracks.util.StringUtils;
  */
 class TrackRecordingServiceNotificationManager {
 
-    private final static int NOTIFICATION_ID = 123;
+    static final int NOTIFICATION_ID = 123;
 
-    private final static String CHANNEL_ID = TrackRecordingServiceNotificationManager.class.getSimpleName();
+    private static final String CHANNEL_ID = TrackRecordingServiceNotificationManager.class.getSimpleName();
 
-    private NotificationCompat.Builder notificationBuilder;
+    private final NotificationCompat.Builder notificationBuilder;
 
-    private NotificationManager notificationManager;
+    private final NotificationManager notificationManager;
 
     private boolean previousLocationWasAccurate = true;
 
@@ -76,6 +76,7 @@ class TrackRecordingServiceNotificationManager {
 
         notificationBuilder.setContentText(context.getString(R.string.track_recording_notification_accuracy, formattedAccuracy));
         updateNotification();
+
         notificationBuilder.setOnlyAlertOnce(true);
     }
 
@@ -84,6 +85,10 @@ class TrackRecordingServiceNotificationManager {
         updateNotification();
     }
 
+    void cancelNotification() {
+        notificationManager.cancel(NOTIFICATION_ID);
+    }
+
     Notification getNotification() {
         return notificationBuilder.build();
     }

src/main/java/de/dennisguse/opentracks/services/sensors/BluetoothConnectionManager.java

@@ -57,9 +57,9 @@ public class BluetoothConnectionManager {
     private SensorState sensorState;
 
     private BluetoothGatt bluetoothGatt;
-    private BluetoothDevice bluetoothDevice;
+    private final BluetoothDevice bluetoothDevice;
 
-    private BluetoothGattCallback connectCallback = new BluetoothGattCallback() {
+    private final BluetoothGattCallback connectCallback = new BluetoothGattCallback() {
         @Override
         public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
             switch (newState) {

src/main/java/de/dennisguse/opentracks/services/tasks/AnnouncementPeriodicTask.java

@@ -61,11 +61,7 @@ public class AnnouncementPeriodicTask implements PeriodicTask {
                     stop = false;
                     break;
                 case AudioManager.AUDIOFOCUS_LOSS:
-                    stop = true;
-                    break;
                 case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
-                    stop = true;
-                    break;
                 case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                     stop = true;
                     break;

src/main/java/de/dennisguse/opentracks/settings/BluetoothLeAdapter.java

@@ -74,7 +74,7 @@ public class BluetoothLeAdapter extends BaseAdapter {
 
     public class Device {
         private String name;
-        private String address;
+        private final String address;
 
         public Device(String name, String address) {
             this.name = name;

src/main/java/de/dennisguse/opentracks/settings/BluetoothLePreference.java

@@ -32,9 +32,9 @@ import de.dennisguse.opentracks.util.PreferencesUtils;
  */
 public class BluetoothLePreference extends DialogPreference {
 
-    private final static String TAG = BluetoothLePreference.class.getSimpleName();
+    private static final String TAG = BluetoothLePreference.class.getSimpleName();
 
-    private final static int DEVICE_NONE_RESOURCEID = R.string.value_none;
+    private static final int DEVICE_NONE_RESOURCEID = R.string.value_none;
 
     public BluetoothLePreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
         super(context, attrs, defStyleAttr, defStyleRes);
@@ -88,10 +88,10 @@ public class BluetoothLePreference extends DialogPreference {
     public static class BluetoothLePreferenceDialog extends PreferenceDialogFragmentCompat {
 
         private int selectedEntryIndex;
-        private BluetoothLeAdapter listAdapter = new BluetoothLeAdapter();
+        private final BluetoothLeAdapter listAdapter = new BluetoothLeAdapter();
 
         private BluetoothLeScanner scanner = null;
-        private ScanCallback scanCallback = new ScanCallback() {
+        private final ScanCallback scanCallback = new ScanCallback() {
             @Override
             public void onScanResult(int callbackType, ScanResult result) {
                 super.onScanResult(callbackType, result);

src/main/java/de/dennisguse/opentracks/settings/SettingsActivity.java

@@ -50,10 +50,6 @@ public class SettingsActivity extends AppCompatActivity implements ChooseActivit
 
     public static class PrefsFragment extends PreferenceFragmentCompat {
 
-        /*
-         * Note that sharedPreferenceChangeListener cannot be an anonymous inner class.
-         * Anonymous inner class will get garbage collected.
-         */
         private final SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() {
             @Override
             public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {

src/main/java/de/dennisguse/opentracks/stats/TripStatisticsUpdater.java

@@ -21,10 +21,11 @@ import android.util.Log;
 
 import androidx.annotation.VisibleForTesting;
 
+import de.dennisguse.opentracks.content.data.TrackPointsColumns;
+import de.dennisguse.opentracks.content.provider.TrackPointIterator;
 import de.dennisguse.opentracks.util.LocationUtils;
 
 import static de.dennisguse.opentracks.services.TrackRecordingService.MAX_NO_MOVEMENT_SPEED;
-import static de.dennisguse.opentracks.services.TrackRecordingService.PAUSE_LATITUDE;
 
 /**
  * Updater for {@link TripStatistics}.
@@ -122,7 +123,7 @@ public class TripStatisticsUpdater {
         updateTime(location.getTime());
         if (!LocationUtils.isValidLocation(location)) {
             // Either pause or resume marker
-            if (location.getLatitude() == PAUSE_LATITUDE) {
+            if (location.getLatitude() == TrackPointsColumns.PAUSE_LATITUDE) {
                 if (lastLocation != null && lastMovingLocation != null && lastLocation != lastMovingLocation) {
                     currentSegment.addTotalDistance(lastMovingLocation.distanceTo(lastLocation));
                 }
@@ -178,6 +179,13 @@ public class TripStatisticsUpdater {
         lastMovingLocation = location;
     }
 
+    public void addLocation(TrackPointIterator iterator, int minRecordingDistance) {
+        while (iterator.hasNext()) {
+            Location location = iterator.next();
+            addLocation(location, minRecordingDistance);
+        }
+    }
+
     /**
      * Gets the smoothed elevation over several readings.
      * The elevation readings is noisy so the smoothed elevation is better than the raw elevation for many tasks.

src/main/java/de/dennisguse/opentracks/util/BluetoothUtils.java

@@ -60,7 +60,7 @@ public class BluetoothUtils {
         while (adapters.isEmpty()) {
             synchronized (mutex) {
                 try {
-                    mutex.wait(UnitConversions.ONE_SECOND);
+                    mutex.wait(UnitConversions.ONE_SECOND_MS);
                 } catch (InterruptedException e) {
                     Log.e(TAG, "Interrupted while waiting for default bluetooth adapter", e);
                 }

src/main/java/de/dennisguse/opentracks/util/FileUtils.java

@@ -80,19 +80,6 @@ public class FileUtils {
         return buildUniqueFileName(directory, fileBaseName, extension, 0);
     }
 
-    /**
-     * Gets the name from a file name, without the extension.
-     *
-     * @param fileName the file name
-     */
-    public static String getName(String fileName) {
-        int index = fileName.lastIndexOf('.');
-        if (index == -1) {
-            return fileName;
-        }
-        return fileName.substring(0, index);
-    }
-
     /**
      * Gets the extension from a file name.
      * Returns null if there is no extension.

src/main/java/de/dennisguse/opentracks/util/IntentDashboardUtils.java

@@ -1,7 +1,6 @@
 package de.dennisguse.opentracks.util;
 
 import android.content.ClipData;
-import android.content.ContentUris;
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
@@ -10,6 +9,7 @@ import java.util.ArrayList;
 
 import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.data.TracksColumns;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 
 /**
  * Create an {@link Intent} to request showing a Dashboard.
@@ -24,11 +24,12 @@ public class IntentDashboardUtils {
     private IntentDashboardUtils() {
     }
 
-    public static boolean startDashboardPlugin(Context context, long trackId) {
+    public static boolean startDashboard(Context context, long[] trackIds) {
         ArrayList<Uri> uris = new ArrayList<>();
+        String trackIdList = ContentProviderUtils.formatIdListForUri(trackIds);
 
-        uris.add(0, ContentUris.withAppendedId(TracksColumns.CONTENT_URI, trackId));
-        uris.add(1, ContentUris.withAppendedId(TrackPointsColumns.CONTENT_URI, trackId));
+        uris.add(0, Uri.withAppendedPath(TracksColumns.CONTENT_URI, trackIdList));
+        uris.add(1, Uri.withAppendedPath(TrackPointsColumns.CONTENT_URI_BY_TRACKID, trackIdList));
 
         Intent intent = new Intent(ACTION_DASHBOARD);
         intent.putParcelableArrayListExtra(ACTION_DASHBOARD_PAYLOAD, uris);
@@ -47,4 +48,5 @@ public class IntentDashboardUtils {
 
         return false;
     }
+
 }

src/main/java/de/dennisguse/opentracks/util/IntentUtils.java

@@ -33,12 +33,12 @@ import java.util.ArrayList;
 import java.util.Date;
 
 import de.dennisguse.opentracks.R;
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.DescriptionGenerator;
-import de.dennisguse.opentracks.content.ShareContentProvider;
 import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TrackPointsColumns;
 import de.dennisguse.opentracks.content.data.Waypoint;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
+import de.dennisguse.opentracks.content.provider.ShareContentProvider;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
 
 /**
@@ -48,7 +48,7 @@ import de.dennisguse.opentracks.io.file.TrackFileFormat;
  */
 public class IntentUtils {
 
-    private final static String TAG = IntentUtils.class.getSimpleName();
+    private static final String TAG = IntentUtils.class.getSimpleName();
 
     private static final String JPEG_EXTENSION = "jpeg";
 
@@ -140,7 +140,7 @@ public class IntentUtils {
             return;
         }
 
-        if (IntentDashboardUtils.startDashboardPlugin(context, trackIds[0])) {
+        if (IntentDashboardUtils.startDashboard(context, trackIds)) {
             return;
         }
 
@@ -151,9 +151,9 @@ public class IntentUtils {
         intent.setDataAndType(uriAndMime.first, uriAndMime.second);
 
         intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
-        try {
+        if (intent.resolveActivity(context.getPackageManager()) != null) {
             context.startActivity(intent);
-        } catch (ActivityNotFoundException e) {
+        } else {
             Toast.makeText(context, context.getString(R.string.app_not_installed_show_on_map), Toast.LENGTH_SHORT).show();
         }
     }

src/main/java/de/dennisguse/opentracks/util/PreferencesUtils.java

@@ -20,6 +20,7 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.SharedPreferences.Editor;
 
+import androidx.annotation.VisibleForTesting;
 import androidx.preference.PreferenceManager;
 
 import de.dennisguse.opentracks.R;
@@ -38,21 +39,30 @@ public class PreferencesUtils {
         return PreferenceManager.getDefaultSharedPreferences(context);
     }
 
+    public static void register(Context context, SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener) {
+        getSharedPreferences(context).registerOnSharedPreferenceChangeListener(sharedPreferenceChangeListener);
+    }
+
+    public static void unregister(Context context, SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener) {
+        getSharedPreferences(context).unregisterOnSharedPreferenceChangeListener(sharedPreferenceChangeListener);
+    }
+
     @Deprecated
     //NOTE: is at the moment still used to determine if a track is currently recorded; better ask the service directly.
     //NOTE: This was also used to recover from a reboot, but this data should not be exposed to the whole application.
     public static final long RECORDING_TRACK_ID_DEFAULT = -1L;
 
     public static long getRecordingTrackId(Context context) {
-        return PreferencesUtils.getLong(context, R.string.recording_track_id_key, RECORDING_TRACK_ID_DEFAULT);
+        SharedPreferences sharedPreferences = getSharedPreferences(context);
+        return sharedPreferences.getLong(getKey(context, R.string.recording_track_id_key), RECORDING_TRACK_ID_DEFAULT);
     }
 
     public static String getDefaultActivity(Context context) {
-        return PreferencesUtils.getString(context, R.string.default_activity_key, context.getString(R.string.default_activity_default));
+        return getString(context, R.string.default_activity_key, context.getString(R.string.default_activity_default));
     }
 
     public static void setDefaultActivity(Context context, String newDefaultActivity) {
-        PreferencesUtils.setString(context, R.string.default_activity_key, newDefaultActivity);
+        setString(context, R.string.default_activity_key, newDefaultActivity);
     }
 
     /**
@@ -73,7 +83,7 @@ public class PreferencesUtils {
      * @return true if key == null or key belongs to keyId
      */
     public static boolean isKey(Context context, int keyId, String key) {
-        return key == null || key.equals(PreferencesUtils.getKey(context, keyId));
+        return key == null || key.equals(getKey(context, keyId));
     }
 
     /**
@@ -134,6 +144,7 @@ public class PreferencesUtils {
      * @param keyId   the key id
      * @param value   the value
      */
+    @VisibleForTesting
     public static void setInt(Context context, int keyId, int value) {
         SharedPreferences sharedPreferences = getSharedPreferences(context);
         Editor editor = sharedPreferences.edit();
@@ -141,17 +152,6 @@ public class PreferencesUtils {
         editor.apply();
     }
 
-    /**
-     * Gets a long preference value.
-     *
-     * @param context the context
-     * @param keyId   the key id
-     */
-    private static long getLong(Context context, int keyId, long defaultValue) {
-        SharedPreferences sharedPreferences = getSharedPreferences(context);
-        return sharedPreferences.getLong(getKey(context, keyId), defaultValue);
-    }
-
     /**
      * Sets a long preference value.
      *
@@ -203,7 +203,7 @@ public class PreferencesUtils {
     }
 
     public static boolean isRecordingTrackPaused(Context context) {
-        return PreferencesUtils.getBoolean(context, R.string.recording_track_paused_key, isRecordingTrackPausedDefault(context));
+        return getBoolean(context, R.string.recording_track_paused_key, isRecordingTrackPausedDefault(context));
     }
 
     public static boolean isRecordingTrackPausedDefault(Context context) {
@@ -212,7 +212,7 @@ public class PreferencesUtils {
 
     public static void defaultRecordingTrackPaused(Context context) {
         final boolean RECORDING_TRACK_PAUSED = context.getResources().getBoolean(R.bool.recording_track_paused_default);
-        PreferencesUtils.setBoolean(context, R.string.recording_track_paused_key, RECORDING_TRACK_PAUSED);
+        setBoolean(context, R.string.recording_track_paused_key, RECORDING_TRACK_PAUSED);
     }
 
     public static String getBluetoothHeartRateSensorAddressNone(Context context) {
@@ -228,7 +228,7 @@ public class PreferencesUtils {
     }
 
     public static String getBluetoothHeartRateSensorAddress(Context context) {
-        return PreferencesUtils.getString(context, R.string.settings_sensor_bluetooth_heart_rate_key, getBluetoothHeartRateSensorAddressNone(context));
+        return getString(context, R.string.settings_sensor_bluetooth_heart_rate_key, getBluetoothHeartRateSensorAddressNone(context));
     }
 
     public static boolean shouldShowStatsOnLockscreen(Context context) {
@@ -243,21 +243,21 @@ public class PreferencesUtils {
 
     public static boolean isShowStatsGradeElevation(Context context) {
         final boolean STATS_SHOW_GRADE_ELEVATION = context.getResources().getBoolean(R.bool.stats_show_grade_elevation_default);
-        return PreferencesUtils.getBoolean(context, R.string.stats_show_grade_elevation_key, STATS_SHOW_GRADE_ELEVATION);
+        return getBoolean(context, R.string.stats_show_grade_elevation_key, STATS_SHOW_GRADE_ELEVATION);
     }
 
     public static boolean isStatsShowCoordinate(Context context) {
         final boolean STATS_SHOW_COORDINATE = context.getResources().getBoolean(R.bool.stats_show_coordinate_default);
-        return PreferencesUtils.getBoolean(context, R.string.stats_show_coordinate_key, STATS_SHOW_COORDINATE);
+        return getBoolean(context, R.string.stats_show_coordinate_key, STATS_SHOW_COORDINATE);
     }
 
     public static int getVoiceFrequency(Context context) {
         final int VOICE_FREQUENCY_DEFAULT = Integer.parseInt(context.getResources().getString(R.string.voice_frequency_default));
-        return PreferencesUtils.getInt(context, R.string.voice_frequency_key, VOICE_FREQUENCY_DEFAULT);
+        return getInt(context, R.string.voice_frequency_key, VOICE_FREQUENCY_DEFAULT);
     }
 
     public static int getRecordingDistanceInterval(Context context) {
-        return PreferencesUtils.getInt(context, R.string.recording_distance_interval_key, getRecordingDistanceIntervalDefault(context));
+        return getInt(context, R.string.recording_distance_interval_key, getRecordingDistanceIntervalDefault(context));
     }
 
     public static int getRecordingDistanceIntervalDefault(Context context) {
@@ -266,12 +266,12 @@ public class PreferencesUtils {
 
     public static int getMaxRecordingDistance(Context context) {
         final int MAX_RECORDING_DISTANCE = Integer.parseInt(context.getResources().getString(R.string.max_recording_distance_default));
-        return PreferencesUtils.getInt(context, R.string.max_recording_distance_key, MAX_RECORDING_DISTANCE);
+        return getInt(context, R.string.max_recording_distance_key, MAX_RECORDING_DISTANCE);
     }
 
     public static int getMinRecordingInterval(Context context) {
         final int MIN_RECORDING_INTERVAL = Integer.parseInt(context.getResources().getString(R.string.min_recording_interval_default));
-        return PreferencesUtils.getInt(context, R.string.min_recording_interval_key, MIN_RECORDING_INTERVAL);
+        return getInt(context, R.string.min_recording_interval_key, MIN_RECORDING_INTERVAL);
     }
 
     public static int getMinRecordingIntervalAdaptAccuracy(Context context) {
@@ -286,19 +286,20 @@ public class PreferencesUtils {
         return Integer.parseInt(context.getResources().getString(R.string.min_recording_interval_default));
     }
 
-
     public static int getRecordingGPSAccuracy(Context context) {
         final int RECORDING_GPS_ACCURACY = Integer.parseInt(context.getResources().getString(R.string.recording_gps_accuracy_default));
-        return PreferencesUtils.getInt(context, R.string.recording_gps_accuracy_key, RECORDING_GPS_ACCURACY);
+        return getInt(context, R.string.recording_gps_accuracy_key, RECORDING_GPS_ACCURACY);
     }
 
     public static boolean isRecording(Context context) {
-        long recordingTrackId = PreferencesUtils.getRecordingTrackId(context);
-        return recordingTrackId != PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+        long recordingTrackId = getRecordingTrackId(context);
+        return isRecording(recordingTrackId);
     }
 
+    @Deprecated
+    //TODO Method is very misleading: it only checks if the provided trackId not the default value (i.e., not recording).
     public static boolean isRecording(long recordingTrackId) {
-        return recordingTrackId != PreferencesUtils.RECORDING_TRACK_ID_DEFAULT;
+        return recordingTrackId != RECORDING_TRACK_ID_DEFAULT;
     }
 
     public static void resetPreferences(Context context, boolean readAgain) {

src/main/java/de/dennisguse/opentracks/util/StringUtils.java

@@ -17,6 +17,7 @@ package de.dennisguse.opentracks.util;
 
 import android.content.Context;
 import android.location.Location;
+import android.os.Build;
 import android.text.TextUtils;
 import android.text.format.DateUtils;
 import android.util.Pair;
@@ -24,6 +25,9 @@ import android.util.Pair;
 import java.text.DecimalFormat;
 import java.text.ParsePosition;
 import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.TemporalAccessor;
 import java.util.Date;
 import java.util.Locale;
 import java.util.TimeZone;
@@ -42,8 +46,16 @@ public class StringUtils {
 
     private static final String COORDINATE_DEGREE = "\u00B0";
 
+    //TODO Remove when upgrading to API level 26+.
+    @Deprecated
     private static final SimpleDateFormat ISO_8601_DATE_TIME_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
+
+    //TODO Remove when upgrading to API level 26+.
+    @Deprecated
     private static final SimpleDateFormat ISO_8601_BASE = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss", Locale.US);
+
+    //TODO Remove when upgrading to API level 26+.
+    @Deprecated
     private static final Pattern ISO_8601_EXTRAS = Pattern.compile("^(\\.\\d+)?(?:Z|([+-])(\\d{2}):(\\d{2}))?$");
 
     static {
@@ -51,7 +63,6 @@ public class StringUtils {
         ISO_8601_BASE.setTimeZone(TimeZone.getTimeZone("UTC"));
     }
 
-
     private StringUtils() {
     }
 
@@ -73,7 +84,11 @@ public class StringUtils {
      * @param time_ms the time in milliseconds
      */
     public static String formatDateTimeIso8601(long time_ms) {
-        return ISO_8601_DATE_TIME_FORMAT.format(time_ms);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            return Instant.ofEpochMilli(time_ms).toString();
+        } else {
+            return ISO_8601_DATE_TIME_FORMAT.format(time_ms);
+        }
     }
 
     /**
@@ -269,8 +284,19 @@ public class StringUtils {
      *
      * @param xmlDateTime the XML date time string
      */
-    //TODO Can this be replaced using java.time?
-    public static long getTime(String xmlDateTime) {
+    public static long parseTime(String xmlDateTime) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            try {
+                TemporalAccessor t = DateTimeFormatter.ISO_DATE_TIME.parse(xmlDateTime);
+                return Instant.from(t).toEpochMilli();
+            } catch (Exception e) {
+                throw new IllegalArgumentException("Invalid XML dateTime value: " + e);
+            }
+        }
+
+        //TODO Remove the following when upgrading to API level 26+.
+        //ATTENTION: The following code does not require a time zone (+01 or Z); while ISO_DATE_TIME requires this!
+
         // Parse the date time base
         ParsePosition position = new ParsePosition(0);
         Date date = ISO_8601_BASE.parse(xmlDateTime, position);

src/main/java/de/dennisguse/opentracks/util/SystemUtils.java

@@ -99,4 +99,16 @@ public class SystemUtils {
         }
         return wakeLock;
     }
+
+    /**
+     * Releases the wake lock if it is held.
+     *
+     * @return null
+     */
+    public static WakeLock releaseWakeLock(WakeLock wakeLock) {
+        if (wakeLock != null && wakeLock.isHeld()) {
+            wakeLock.release();
+        }
+        return null;
+    }
 }

src/main/java/de/dennisguse/opentracks/util/TrackUtils.java

@@ -18,9 +18,9 @@ package de.dennisguse.opentracks.util;
 
 import android.content.Context;
 
-import de.dennisguse.opentracks.content.ContentProviderUtils;
 import de.dennisguse.opentracks.content.data.Track;
 import de.dennisguse.opentracks.content.data.TracksColumns;
+import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 
 /**
  * Utilities for updating track.
@@ -29,7 +29,7 @@ import de.dennisguse.opentracks.content.data.TracksColumns;
  */
 public class TrackUtils {
 
-    public static String TRACK_SORT_ORDER = TracksColumns.STARTTIME + " DESC";
+    public static final String TRACK_SORT_ORDER = TracksColumns.STARTTIME + " DESC";
 
     private TrackUtils() {
     }

src/main/java/de/dennisguse/opentracks/util/UnitConversions.java

@@ -27,7 +27,9 @@ public class UnitConversions {
 
     // Time
     // 1 second in milliseconds
-    public static final long ONE_SECOND = UnitConversions.S_TO_MS;
+    public static final long ONE_SECOND_MS = UnitConversions.S_TO_MS;
+    public static final long ONE_MINUTE_MS = (long) (UnitConversions.MIN_TO_S * UnitConversions.S_TO_MS);
+
     // multiplication factor to convert milliseconds to seconds
     public static final double MS_TO_S = 1d / S_TO_MS;
     // multiplication factor to convert minutes to seconds

src/main/res/layout/about.xml

@@ -10,8 +10,8 @@
         android:id="@+id/imageView"
         android:layout_width="match_parent"
         android:layout_height="239dp"
-        android:scaleType="fitCenter"
         android:contentDescription="@string/app_name"
+        android:scaleType="fitCenter"
         android:src="@drawable/ic_logo_color_24dp" />
 
     <TextView
@@ -80,6 +80,7 @@
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:autoLink="web"
         android:gravity="center"
         android:text="@string/third_party_libraries" />
 

src/main/res/layout/help.xml

@@ -44,20 +44,6 @@
                 android:linksClickable="true"
                 android:text="@string/help_track_map_content" />
 
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:layout_marginTop="20dp"
-                android:text="@string/help_data_statistics_customized_title"
-                android:textStyle="bold" />
-
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:text="@string/help_data_statistics_customized_content" />
-
             <TextView
                 style="@style/TextMedium"
                 android:layout_width="match_parent"
@@ -72,34 +58,6 @@
                 android:layout_height="wrap_content"
                 android:text="@string/help_recording_content" />
 
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:layout_marginTop="20dp"
-                android:text="@string/help_gps_imprecise_title"
-                android:textStyle="bold" />
-
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:text="@string/help_gps_imprecise_content" />
-
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:layout_marginTop="20dp"
-                android:text="@string/help_heart_rate_sensors_title"
-                android:textStyle="bold" />
-
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:text="@string/help_heart_rate_sensors_content" />
-
             <TextView
                 style="@style/TextMedium"
                 android:layout_width="match_parent"
@@ -128,20 +86,6 @@
                 android:layout_height="wrap_content"
                 android:text="@string/help_track_export_content" />
 
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:layout_marginTop="20dp"
-                android:text="@string/help_data_upload_title"
-                android:textStyle="bold" />
-
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:text="@string/generic_no" />
-
             <TextView
                 style="@style/TextMedium"
                 android:layout_width="match_parent"
@@ -155,20 +99,6 @@
                 android:layout_height="wrap_content"
                 android:text="@string/generic_no" />
 
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:layout_marginTop="20dp"
-                android:text="@string/help_data_online_title"
-                android:textStyle="bold" />
-
-            <TextView
-                style="@style/TextMedium"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:text="@string/generic_no" />
-
             <TextView
                 style="@style/TextMedium"
                 android:layout_width="match_parent"
@@ -182,6 +112,36 @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:text="@string/help_data_storage_content" />
+
+            <TextView
+                style="@style/TextMedium"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="20dp"
+                android:text="@string/help_gps_troubleshooting_title"
+                android:textStyle="bold" />
+
+            <TextView
+                style="@style/TextMedium"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:linksClickable="true"
+                android:text="@string/help_gps_troubleshooting_content" />
+
+            <TextView
+                style="@style/TextMedium"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="20dp"
+                android:text="@string/help_support_title"
+                android:textStyle="bold" />
+
+            <TextView
+                style="@style/TextMedium"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:linksClickable="true"
+                android:text="@string/help_support_content" />
         </LinearLayout>
     </ScrollView>
 

src/main/res/menu/list_context_menu.xml

@@ -15,16 +15,16 @@ limitations under the License.
 -->
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
-    <item
-        android:id="@+id/list_context_menu_share"
-        android:icon="@drawable/ic_share_24dp"
-        android:title="@string/menu_share"
-        app:showAsAction="ifRoom" />
     <item
         android:id="@+id/list_context_menu_show_on_map"
         android:icon="@drawable/ic_map_24dp"
         android:title="@string/menu_show_on_map"
         app:showAsAction="ifRoom" />
+    <item
+        android:id="@+id/list_context_menu_share"
+        android:icon="@drawable/ic_share_24dp"
+        android:title="@string/menu_share"
+        app:showAsAction="ifRoom" />
     <item
         android:id="@+id/list_context_menu_edit"
         android:icon="@drawable/ic_edit_24dp"

src/main/res/values-de/strings.xml

@@ -102,6 +102,8 @@
     <string name="description_track_segment">Segment</string>
     <string name="export_all_option">Alle als %1$s</string>
     <string name="export_all_title">In externen Speicher exportieren</string>
+    <string name="export_with_photos">mit Fotos</string>
+    <string name="export_without_photos">ohne Fotos</string>
     <string name="export_external_storage">Externer Speicher</string>
     <string name="export_external_storage_error">%1$d von %2$s in %3$s exportiert</string>
     <string name="export_external_storage_option">als %1$s in %2$s</string>

src/main/res/values-es/strings.xml

@@ -102,6 +102,8 @@
     <string name="description_track_segment">Segmento</string>
     <string name="export_all_option">Todo como %1$s</string>
     <string name="export_all_title">Exportar a unidad de almacenamiento externa</string>
+    <string name="export_with_photos">con fotos</string>
+    <string name="export_without_photos">sin fotos</string>
     <string name="export_external_storage">Unidad de almacenamiento externa</string>
     <string name="export_external_storage_error">Se exportaron %1$d de %2$s a %3$s</string>
     <string name="export_external_storage_option">como %1$s a %2$s</string>

src/main/res/values/strings.xml

@@ -24,43 +24,77 @@ limitations under the License.
     <!-- Help -->
     <string name="help_feature_title">OpenTracks has the following features:</string>
     <string name="help_feature_content">
-        * Create markers (incl. pictures)\n
-        * Heart rate sensor (Bluetooth LE)\n
-        * Voice announcements by time or distance\n
-        * While recording, show on lock screen\n
-        * Share tracks
+        * create GPS tracks\n
+        * use a heart rate sensor (Bluetooth LE only)\n
+        * voice announcements (by time or distance)\n
+        * create markers (incl. pictures)\n
+        * works completely offline\n
+        * show tracks on a map (see below)
     </string>
-    <string name="help_data_statistics_customized_title">Can the statistics view be customized?</string>
-    <string name="help_data_statistics_customized_content">Yes, it can be customized in the Settings.</string>
-    <string name="help_recording_title">How does OpenTracks record data?</string>
-    <string name="help_recording_content">OpenTracks uses the GPS sensor of the device to record the location continuously.</string>
-    <string name="help_gps_imprecise_title">Statistics (e.g., speed) reported by OpenTracks are imprecise?</string>
-    <string name="help_gps_imprecise_content">OpenTracks directly uses the data provided by the GPS of the mobile device. If the GPS device reports inaccurate locations, OpenTracks cannot do anything about it.</string>
-    <string name="help_heart_rate_sensors_title">Which heart rate sensors does OpenTracks support?</string>
-    <string name="help_heart_rate_sensors_content">OpenTracks should work with any Bluetooth LE heart sensor that support streaming the data in real-time. Smartwatches that store the heart rate data are not supported.</string>
+
     <string name="help_track_map_title">How to show a track on a map?</string>
     <string name="help_track_map_content">
-This requires a 3rd party application to be installed that can consume KMZ-encoded geo data.
-This works well with <a href="http://osmand.net/">OsmAnd~</a> and <a href="https://maps.me/">Maps.ME</a>.
-In fact, an App needs to support <i>ACTION_VIEW</i> with MIME <i>application/vnd.google-earth.kmz</i>.
-At the moment, the recorded locations as well as the timestamps are send to an App while pictures and sensor data are not shared.</string>
+        Use the small map icon.\n
+        a)
+        (live updates) Install <a href="https://github.com/OpenTracksApp/OSMDashboard">OSMDashboard</a>.
+        It provides online or offline maps via <a href="https://www.openstreetmap.org">OpenStreetmap</a>.\n
+        Actually, OSMDashboard is a separate app that only can access (temporarily) access the data of track(s) that are going to be shown.
+
+        \n
+        b)
+        Via a "normal" map application (e.g., <a href="http://osmand.net/">OsmAnd</a> and <a href="https://maps.me/">MAPS.ME</a>).
+        Those app need to support the KMZ file format (only locations and timestamps).
+        In fact, an app needs to support <i>ACTION_VIEW</i> with MIME <i>application/vnd.google-earth.kmz</i>.
+    </string>
+
     <string name="help_storage_pictures_title">How does OpenTracks store pictures that were taken as markers?</string>
-    <string name="help_storage_pictures_content">These are stored directly on the file system.</string>
+    <string name="help_storage_pictures_content">These are stored in the app internal storage (i.e., only accessible within OpenTracks).</string>
+
     <string name="help_track_export_title">How can I export/share recorded tracks?</string>
     <string name="help_track_export_content">
         Tracks can be exported from the Settings as KMZ, KML, or GPX.
-        KMZ contains all data incl. images, while KML contains only the sensor data, and GPX only the location.
-        Tracks shared via the <i>share icon</i> are shared as KMZ and any App can be used to send the data.
+        KMZ/KML all data; GPX only locations.
+        Tracks shared via the <i>share icon</i> are shared as KMZ.
     </string>
-    <string name="help_data_upload_title">Can OpenTracks upload the data automatically?</string>
+
     <string name="help_data_google_play_services_title">Does OpenTracks require/use Google Play Service?</string>
-    <string name="help_data_online_title">Does OpenTracks use online services?</string>
+
+    <string name="help_recording_title">How does OpenTracks record data?</string>
+    <string name="help_recording_content">
+        OpenTracks uses the GPS sensor of the device to record the location continuously.
+        If the GPS device reports inaccurate data (e.g., location, speed, elevation), OpenTracks cannot do anything about it.
+    </string>
+
     <string name="help_data_storage_title">How does OpenTracks store sensor data?</string>
     <string name="help_data_storage_content">
-        OpenTracks stores sensor data per recorded location.
-        In terms of a heart rate sensor this means that only <i>one</i> heart rate measurement is stored per location.
+        Sensor data is stored per recorded location.
+        In terms of a heart rate sensor, this means that only <i>one</i> heart rate measurement is stored per location.
         If you are standing still or are indoors, no sensor data will be recorded (but it will be shown).
     </string>
+
+    <string name="help_gps_troubleshooting_title">OpenTracks is not recording locations?</string>
+    <string name="help_gps_troubleshooting_content">
+        What you can do:\n
+        a) check if GPS is enabled,\n
+        b) improve GPS reception (e.g., go outdoors),\n
+        c) check if with <a href="https://f-droid.org/en/packages/com.android.gpstest.osmdroid/">GPSTest</a> app, and\n
+        d) disable power saving.\n
+        \n
+        If everything does not help please report a bug.
+    </string>
+
+    <string name="help_support_title">How can I support OpenTracks?</string>
+    <string name="help_support_content">
+        You can:\n
+        a) spread the word about OpenTracks,\n
+        b) <a href="https://github.com/OpenTracksApp/OpenTracks/issues">propose features</a>,\n
+        c) <a href="https://github.com/OpenTracksApp/OpenTracks/issues">report bugs</a>,\n
+        d) help in software development,\n
+        e) buy in <a href="https://play.google.com/store/apps/details?id=de.dennisguse.opentracks.playstore">Google Play Store</a>,\n
+        f) donate, and\n
+        g) do whatever you think helps OpenTracks.
+    </string>
+
     <!-- Activity Type -->
     <string name="activity_type_airplane">airplane</string>
     <string name="activity_type_atv">ATV</string>
@@ -167,6 +201,8 @@ At the moment, the recorded locations as well as the timestamps are send to an A
     <!-- Export -->
     <string name="export_all_option">All as %1$s</string>
     <string name="export_all_title">Export to external storage</string>
+    <string name="export_with_photos">with photos</string>
+    <string name="export_without_photos">without photos</string>
     <string name="export_external_storage">External storage</string>
     <string name="export_external_storage_error">Exported %1$d of %2$s to %3$s</string>
     <string name="export_external_storage_option">as %1$s to %2$s</string>