Release: v4.4.0

Currently translated at 97.6% (493 of 505 strings)

Translation: OpenTracks/opentracks.src-main-res-values-strings-xml--main
Translate-URL: https://hosted.weblate.org/projects/opentracks/opentracks-src-main-res-values-strings-xml-main/nb_NO/

.github/workflows/build_apk.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: 'adopt'
-          java-version: '11'
+          java-version: '17'
 
       - name: Assemble APK
         shell: bash

.github/workflows/lint.yml

@@ -16,6 +16,6 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: 'zulu'
-          java-version: '11'
+          java-version: '17'
 
       - run: ./gradlew lint

README.md

@@ -2,7 +2,7 @@
 
 _OpenTracks_ is a sport tracking application that completely respects your privacy.
 
-[![Awesome Humane Tech](https://raw.githubusercontent.com/humanetech-community/awesome-humane-tech/main/humane-tech-badge.svg?sanitize=true)](https://github.com/humanetech-community/awesome-humane-tech)
+[![Awesome Humane Tech](https://codeberg.org/teaserbot-labs/delightful-humane-design/raw/branch/main/humane-tech-badge.svg)](https://delightful.club/delightful-humane-design/#health)
 
 <table>
     <tr>
@@ -40,8 +40,10 @@ _OpenTracks_ is a sport tracking application that completely respects your priva
     </tr>
 </table>
 
+Translations are hosted on <a href="https://hosted.weblate.org/engage/opentracks/">
+hosted.weblate.org</a>.
 <a href="https://hosted.weblate.org/engage/opentracks/">
-  <img src="https://hosted.weblate.org/widgets/opentracks/-/horizontal-auto.svg" alt="Translation status" />
+<img src="https://hosted.weblate.org/widgets/opentracks/-/horizontal-auto.svg" alt="Translation status" />
 </a>
 
 ## Screenshots
@@ -150,7 +152,7 @@ The developer documentation is in [README_API.md](README_API.md).
 ## Project history
 
 _OpenTracks_ is based upon Google _My Tracks app_ ([code](https://code.google.com/archive/p/mytracks/)).
-Initially, _My Tracks_ was initially released by Google in 2010 as [open-source software](http://google-latlong.blogspot.fr/2010/05/code-for-my-tracks-is-now-yours.html).
+_My Tracks_ was initially released by Google in 2010 as [open-source software](http://google-latlong.blogspot.fr/2010/05/code-for-my-tracks-is-now-yours.html).
 In 2016, [Google decided to discontinue](https://support.google.com/maps/answer/6333516) _My Tracks_ and stopped distributing it via the Google Play store in April 2016.
 Then [Plonk42](https://github.com/plonk42) conducted some maintenance work until 2016, so _My Tracks_ could still be used (based upon version _Google's MyTracks_ version 2.0.6).
 Plonk42's version is available [here](https://github.com/Plonk42/mytracks).

README_RELEASE.md

@@ -17,7 +17,7 @@ Application id: de.dennisguse.opentracks
 It if it properly tagged F-Droid takes care of building the app and publishing.
 Usually, it takes two days before the update is published (build, signed, and published). 
 
-The recent build activity can be found [here](https://f-droid.org/wiki/index.php?title=Special:RecentChanges&days=7&from=&hidebots=0&hideanons=1&hideliu=1&limit=500)
+The recent build activity can be found [here](https://monitor.f-droid.org/builds/build)
 
 ## Google Play Store
 Application id: `de.dennisguse.opentracks.playstore`

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.3.1'
+        classpath 'com.android.tools.build:gradle:8.1.0-beta03'
     }
 }
 
@@ -47,20 +47,25 @@ android {
     compileOptions {
         coreLibraryDesugaringEnabled true
 
-        sourceCompatibility JavaVersion.VERSION_11
+        sourceCompatibility JavaVersion.VERSION_17
-        targetCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_17
     }
 
     compileSdk 33
 
     buildFeatures {
         viewBinding true
+        buildConfig true
+    }
+
+    androidResources {
+        generateLocaleConfig = true
     }
 
     defaultConfig {
         applicationId "de.dennisguse.opentracks"
-        versionCode 5119
+        versionCode 5222
-        versionName "v4.2.0"
+        versionName "v4.4.0"
 
         buildConfigField "String", "VERSION_NAME_FULL", "\"${getVersionName()}\""
 
@@ -106,11 +111,11 @@ android {
         }
     }
 
-    applicationVariants.all { variant ->
+    applicationVariants.configureEach { variant ->
         variant.resValue "string", "applicationId", variant.applicationId
 
         if (variant.buildType.name == 'nightly') {
-            variant.outputs.all {
+            variant.outputs.configureEach {
                 setVersionCodeOverride(getVersionCode())
                 setVersionNameOverride(getVersionName())
                 outputFileName = "${applicationId}_${variant.versionCode}.apk"
@@ -120,22 +125,23 @@ android {
 }
 
 dependencies {
-    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.2.2'
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.3'
 
-    implementation 'androidx.appcompat:appcompat:1.6.0-rc01'
+    implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'androidx.preference:preference:1.2.0'
     implementation 'androidx.documentfile:documentfile:1.0.1'
     implementation 'androidx.gridlayout:gridlayout:1.0.0'
-    implementation 'com.google.android.material:material:1.7.0'
+    implementation 'com.google.android.material:material:1.9.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
-    implementation 'androidx.core:core-splashscreen:1.0.0'
+    implementation 'androidx.core:core-splashscreen:1.0.1'
+    implementation 'androidx.mediarouter:mediarouter:1.4.0'
 
     androidTestImplementation 'androidx.test:core:1.5.0'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.4'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test:rules:1.5.0'
-    androidTestImplementation 'androidx.test:runner:1.5.1'
+    androidTestImplementation 'androidx.test:runner:1.5.2'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
-    androidTestImplementation 'org.mockito:mockito-android:4.11.0'
+    androidTestImplementation 'org.mockito:mockito-android:5.3.1'
 
     androidTestUtil 'androidx.test:orchestrator:1.4.2'
 }

fastlane/metadata/android/en-US/changelogs/5132.txt

@@ -0,0 +1,8 @@
+v4.2.1: OpenTracks
+
+Changes:
+- Speed sensor: acceptable wheel diameter is 100mm-4000mm
+
+Bugfix:
+- Reconnect to a sensor if connection is lost
+

fastlane/metadata/android/en-US/changelogs/5141.txt

@@ -0,0 +1,9 @@
+v4.2.2: OpenTracks
+
+Bugfix:
+- Track icon wrongly shown in dialog
+- Textcolor for heartrate zone 1 was ignoring theme
+- Not all activityTypes were shown in dropdownlist
+- Crash due to color not found
+
+

fastlane/metadata/android/en-US/changelogs/5151.txt

@@ -0,0 +1,5 @@
+v4.3.0: OpenTracks
+
+Changes:
+- Allow backups (incl. encrypted to the Google)
+- Android 13: allow app-specific language settings

fastlane/metadata/android/en-US/changelogs/5168.txt

@@ -0,0 +1,8 @@
+v4.3.1: OpenTracks
+
+Changes:
+- Setting to skip voice announcements on device speaker
+
+Bugfix:
+- GPS disabled warning was falsely shown
+

fastlane/metadata/android/en-US/changelogs/5189.txt

@@ -0,0 +1,9 @@
+v4.3.2: OpenTracks
+
+Bugfix:
+- KML header was misformed (#1522)
+
+Developer:
+- Use Java 17 (multi-line text, switch)
+- API33: locale config is generated
+

fastlane/metadata/android/en-US/changelogs/5194.txt

@@ -0,0 +1,5 @@
+v4.3.3: OpenTracks
+
+Bugfixes:
+- Hidden fields were shown (introduced in v4.2.0)
+- Speed was shown instead of pace (introduced in v4.2.0)

fastlane/metadata/android/en-US/changelogs/5196.txt

@@ -0,0 +1,4 @@
+v4.3.4: OpenTracks
+
+Bugfix:
+- Android 13: regional locales could not be selected (introduced in v4.3.0)

fastlane/metadata/android/en-US/changelogs/5211.txt

@@ -0,0 +1,6 @@
+v4.3.5: OpenTracks
+
+Bugfix:
+- Sensor parsing had a overflow one off bug (#1559)
+- Insert marker: don't crash if no camera app is installed (#1561)
+

fastlane/metadata/android/en-US/changelogs/5222.txt

@@ -0,0 +1,4 @@
+v4.4.0: OpenTracks
+
+Changes:
+- Export all tracks as one file

fastlane/metadata/android/nl/changelogs/4358.txt

@@ -2,13 +2,13 @@ v3.19.0: OpenTracks
 
 Wijzigingen:
 - Ondersteuning voor Running Speed en Cadence (RCS) sensoren
-- Bij het delen van een track wordt een afbeelding gemaakt
+- Bij delen van een track: maakt een deel-afbeelding
 - Niet trillen bij starten van opnemen
-- Bij opnemen: UI toont recentst ontvangen hoogte, snelheid en richting (ook al is deze niet opgeslagen)
+- Bij opnemen: UI toont meest recente hoogte, snelheid en richting (zelfs als niet opgeslagen)
 
 Bugfix:
-- Berekening van totale tijd mag geen pauze-tijd bevatten (vereist opnieuw importeren)
+- Berekening totale tijd mag geen pauze-tijd bevatten (vereist opnieuw importeren)
-- (opnieuw) Gebruik aangepaste overzichten indien aanwezig
+- (opnieuw) Gebruik aanwezige aangepaste overzichten
 
 Ontwikkelaar:
 - Upgrade naar SDK31 en AGP7.0.0 (vereist JDK11)

fastlane/metadata/android/nl/changelogs/4773.txt

@@ -5,4 +5,4 @@ Wijzigingen:
 - Gesproken meldingen van hartslag
 
 Bugfix:
-- Crash due to race condition
+- Vastloper door race condities

fastlane/metadata/android/zh-TW/full_description.txt

@@ -0,0 +1,22 @@
+一個尊重您的隱私的運動蹤跡紀錄器。
+
+運動與戶外活動賦予幸福、技能與自信。
+
+由保持追蹤您的訓練來重視您的健康。
+紀錄您的跑步或健行，並且在您騎自行車時給您一台具有大螢幕的自行車電腦。
+用照片標記您一路上有趣的地點。
+保持紀錄非常詳細的統計資料以供分析。
+僅分享資料給您想要分享的其他人。
+
+* 語音播報。
+* 支援藍芽 LE 感測器：心律、速度與距離 (騎自行車)、踏頻 (騎自行車)、功率計 (騎自行車)。
+* 海拔上升與下降：通過氣壓感測器。
+* EGM2008 海拔顯示 (平均海平面以上)；匯出為 WGS84。
+* 匯出蹤跡資料為 KMZ (包含照片)、KML、GPX。
+* 沒有網路存取或額外的權限需求。
+* 深色與淺色主題，取決於系統設定。
+* 沒有廣告。
+
+此為 自由軟體 / 免費軟體 / 開放原始碼
+這意味您可以使用、學習、修改與分享此專案的原始碼。
+授權條款：Apache 2.0

fastlane/metadata/android/zh-TW/short_description.txt

@@ -0,0 +1 @@
+一個尊重您的隱私的運動蹤跡紀錄器。

fastlane/metadata/android/zh-TW/title.txt

@@ -0,0 +1 @@
+OpenTracks

gradle.properties

@@ -1,2 +1,2 @@
 android.useAndroidX=true
-org.gradle.jvmargs=-Xmx1024m -XX:MaxPermSize=256m
+org.gradle.jvmargs=-Xmx1024m

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.0.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -205,6 +205,12 @@ set -- \
         org.gradle.wrapper.GradleWrapperMain \
         "$@"
 
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
 # Use "xargs" to parse quoted args.
 #
 # With -n1 it outputs one arg per line, with the quotes and backslashes removed.

gradlew.bat

@@ -14,7 +14,7 @@
 @rem limitations under the License.
 @rem
 
-@if "%DEBUG%" == "" @echo off
+@if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
 @rem
 @rem  Gradle startup script for Windows
@@ -25,7 +25,7 @@
 if "%OS%"=="Windows_NT" setlocal
 
 set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
+if "%DIRNAME%"=="" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
@@ -40,7 +40,7 @@ if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
+if %ERRORLEVEL% equ 0 goto execute
 
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
@@ -75,13 +75,15 @@ set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
 :end
 @rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
+if %ERRORLEVEL% equ 0 goto mainEnd
 
 :fail
 rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
 rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+set EXIT_CODE=%ERRORLEVEL%
-exit /b 1
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
 
 :mainEnd
 if "%OS%"=="Windows_NT" endlocal

src/androidTest/java/de/dennisguse/opentracks/EspressoDeleteTrackTest.java

@@ -13,6 +13,8 @@ import static org.hamcrest.Matchers.allOf;
 import static org.hamcrest.Matchers.anything;
 import static de.dennisguse.opentracks.util.EspressoUtils.waitFor;
 
+import android.Manifest;
+
 import androidx.test.ext.junit.rules.ActivityScenarioRule;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.LargeTest;
@@ -30,7 +32,11 @@ public class EspressoDeleteTrackTest {
     public ActivityScenarioRule<TrackListActivity> mActivityTestRule = new ActivityScenarioRule<>(TrackListActivity.class);
 
     @Rule
-    public GrantPermissionRule mGrantPermissionRule = GrantPermissionRule.grant(android.Manifest.permission.ACCESS_FINE_LOCATION);
+    public GrantPermissionRule mGrantPermissionRuleLocation = GrantPermissionRule.grant(android.Manifest.permission.ACCESS_FINE_LOCATION);
+    @Rule
+    public GrantPermissionRule mGrantPermissionRuleBluetooth = GrantPermissionRule.grant(Manifest.permission.BLUETOOTH_CONNECT);
+    @Rule
+    public GrantPermissionRule mGrantPermissionRuleNotifications = GrantPermissionRule.grant(Manifest.permission.POST_NOTIFICATIONS);
 
     @Test
     public void espressoDeleteTrackTest() {

src/androidTest/java/de/dennisguse/opentracks/EspressoEditTrackRecordingTest.java

@@ -15,6 +15,8 @@ import static androidx.test.espresso.matcher.ViewMatchers.withText;
 import static org.hamcrest.Matchers.allOf;
 import static de.dennisguse.opentracks.util.EspressoUtils.waitFor;
 
+import android.Manifest;
+
 import androidx.test.espresso.ViewInteraction;
 import androidx.test.ext.junit.rules.ActivityScenarioRule;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
@@ -38,7 +40,11 @@ public class EspressoEditTrackRecordingTest {
     public ActivityScenarioRule<TrackListActivity> mActivityTestRule = new ActivityScenarioRule<>(TrackListActivity.class);
 
     @Rule
-    public GrantPermissionRule mGrantPermissionRule = GrantPermissionRule.grant(android.Manifest.permission.ACCESS_FINE_LOCATION);
+    public GrantPermissionRule mGrantPermissionRuleLocation = GrantPermissionRule.grant(android.Manifest.permission.ACCESS_FINE_LOCATION);
+    @Rule
+    public GrantPermissionRule mGrantPermissionRuleBluetooth = GrantPermissionRule.grant(android.Manifest.permission.BLUETOOTH_CONNECT);
+    @Rule
+    public GrantPermissionRule mGrantPermissionRuleNotifications = GrantPermissionRule.grant(Manifest.permission.POST_NOTIFICATIONS);
 
     @LargeTest
     @Test

src/androidTest/java/de/dennisguse/opentracks/EspressoUITest.java

@@ -13,6 +13,8 @@ import static org.hamcrest.Matchers.anything;
 import static de.dennisguse.opentracks.util.EspressoUtils.selectTabAtIndex;
 import static de.dennisguse.opentracks.util.EspressoUtils.waitFor;
 
+import android.Manifest;
+
 import androidx.test.espresso.ViewInteraction;
 import androidx.test.ext.junit.rules.ActivityScenarioRule;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
@@ -31,7 +33,11 @@ public class EspressoUITest {
     public ActivityScenarioRule<TrackListActivity> mActivityTestRule = new ActivityScenarioRule<>(TrackListActivity.class);
 
     @Rule
-    public GrantPermissionRule mGrantPermissionRule = GrantPermissionRule.grant(android.Manifest.permission.ACCESS_FINE_LOCATION);
+    public GrantPermissionRule mGrantPermissionRuleLocation = GrantPermissionRule.grant(android.Manifest.permission.ACCESS_FINE_LOCATION);
+    @Rule
+    public GrantPermissionRule mGrantPermissionRuleBluetooth = GrantPermissionRule.grant(android.Manifest.permission.BLUETOOTH_CONNECT);
+    @Rule
+    public GrantPermissionRule mGrantPermissionRuleNotifications = GrantPermissionRule.grant(Manifest.permission.POST_NOTIFICATIONS);
 
     @LargeTest
     @Test

src/androidTest/java/de/dennisguse/opentracks/io/file/exporter/KmlTrackExporterTest.java

@@ -27,21 +27,23 @@ public class KmlTrackExporterTest {
      */
     @Test
     public void writeCloseSegment_only_write_sensordata_if_present() {
-        String expected = "<when>1970-01-01T00:00:00Z</when>\n" +
+        String expected = """
-                "<coord/>\n" +
+                <when>1970-01-01T00:00:00Z</when>
-                "<when>1970-01-01T01:00:00+01:00</when>\n" +
+                <coord/>
-                "<coord/>\n" +
+                <when>1970-01-01T01:00:00+01:00</when>
-                "<ExtendedData>\n" +
+                <coord/>
-                "<SchemaData schemaUrl=\"#schema\">\n" +
+                <ExtendedData>
-                "</SchemaData>\n" +
+                <SchemaData schemaUrl="#schema">
-                "</ExtendedData>\n" +
+                </SchemaData>
-                "</Track>\n";
+                </ExtendedData>
+                </Track>
+                """;
 
         // given
         TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.SEGMENT_START_MANUAL, Instant.ofEpochSecond(0));
 
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-        KMLTrackExporter kmlTrackWriter = (KMLTrackExporter) TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.createTrackExporter(context);
+        KMLTrackExporter kmlTrackWriter = (KMLTrackExporter) TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.createTrackExporter(context, null);
         kmlTrackWriter.prepare(outputStream);
 
         kmlTrackWriter.writeTrackPoint(ZoneOffset.UTC, trackPoint);

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

@@ -166,7 +166,7 @@ public class ExportImportTest {
 
         trackPointCreator.setClock("2020-02-02T02:02:18Z");
         BluetoothRemoteSensorManager mockRemoteSensorManager = Mockito.mock(BluetoothRemoteSensorManager.class);
-        trackPointCreator.setRemoteSensorManager(mockRemoteSensorManager);
+        trackPointCreator.getSensorManager().setBluetoothSensorManager(mockRemoteSensorManager);
         service.endCurrentTrack();
 
         trackPointCreator.setClock("2020-02-02T02:03:20Z");
@@ -179,7 +179,7 @@ public class ExportImportTest {
         sendLocation(trackPointCreator, "2020-02-02T02:03:23Z", 3, 16.001, 10, 27, 15, 10, 0);
 
         trackPointCreator.setClock("2020-02-02T02:03:24Z");
-        trackPointCreator.setRemoteSensorManager(mockRemoteSensorManager);
+        trackPointCreator.getSensorManager().setBluetoothSensorManager(mockRemoteSensorManager);
         service.endCurrentTrack();
 
         Track track = contentProviderUtils.getTrack(trackId);
@@ -204,11 +204,11 @@ public class ExportImportTest {
         // given
         Track track = contentProviderUtils.getTrack(trackId);
 
-        TrackExporter trackExporter = TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA.createTrackExporter(context);
+        TrackExporter trackExporter = TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA.createTrackExporter(context, contentProviderUtils);
 
         // when
         // 1. export
-        trackExporter.writeTrack(track, context.getContentResolver().openOutputStream(tmpFileUri));
+        trackExporter.writeTrack(List.of(track), context.getContentResolver().openOutputStream(tmpFileUri));
         contentProviderUtils.deleteTrack(context, trackId);
 
         // 2. import
@@ -287,10 +287,10 @@ public class ExportImportTest {
         editor.commit();
         Track track = contentProviderUtils.getTrack(trackId);
 
-        TrackExporter trackExporter = TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.createTrackExporter(context);
+        TrackExporter trackExporter = TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA.createTrackExporter(context, contentProviderUtils);
 
         // when
-        trackExporter.writeTrack(track, context.getContentResolver().openOutputStream(tmpFileUri));
+        trackExporter.writeTrack(List.of(track), context.getContentResolver().openOutputStream(tmpFileUri));
 
         // 2. import
         InputStream inputStream = context.getContentResolver().openInputStream(tmpFileUri);
@@ -310,11 +310,11 @@ public class ExportImportTest {
         // given
         Track track = contentProviderUtils.getTrack(trackId);
 
-        TrackExporter trackExporter = TrackFileFormat.GPX.createTrackExporter(context);
+        TrackExporter trackExporter = TrackFileFormat.GPX.createTrackExporter(context, contentProviderUtils);
 
         // when
         // 1. export
-        trackExporter.writeTrack(track, context.getContentResolver().openOutputStream(tmpFileUri));
+        trackExporter.writeTrack(List.of(track), context.getContentResolver().openOutputStream(tmpFileUri));
         contentProviderUtils.deleteTrack(context, trackId);
 
         // 2. import
@@ -428,11 +428,11 @@ public class ExportImportTest {
         editor.commit();
         Track track = contentProviderUtils.getTrack(trackId);
 
-        TrackExporter trackExporter = TrackFileFormat.GPX.createTrackExporter(context);
+        TrackExporter trackExporter = TrackFileFormat.GPX.createTrackExporter(context, contentProviderUtils);
 
         // when
         // 1. export
-        trackExporter.writeTrack(track, context.getContentResolver().openOutputStream(tmpFileUri));
+        trackExporter.writeTrack(List.of(track), context.getContentResolver().openOutputStream(tmpFileUri));
 
         // 2. import
         InputStream inputStream = context.getContentResolver().openInputStream(tmpFileUri);
@@ -453,11 +453,11 @@ public class ExportImportTest {
         // given
         Track track = contentProviderUtils.getTrack(trackId);
 
-        TrackExporter trackExporter = TrackFileFormat.CSV.createTrackExporter(context);
+        TrackExporter trackExporter = TrackFileFormat.CSV.createTrackExporter(context, contentProviderUtils);
 
         // when
         // 1. export
-        trackExporter.writeTrack(track, context.getContentResolver().openOutputStream(tmpFileUri));
+        trackExporter.writeTrack(List.of(track), context.getContentResolver().openOutputStream(tmpFileUri));
         contentProviderUtils.deleteTrack(context, trackId);
 
         // then
@@ -521,12 +521,12 @@ public class ExportImportTest {
             sensorDataSet.fillTrackPoint(trackPoint);
             return sensorDataSet;
         });
-        trackPointCreator.setRemoteSensorManager(remoteSensorManager);
+        trackPointCreator.getSensorManager().setBluetoothSensorManager(remoteSensorManager);
         trackPointCreator.onChange(new SensorDataSet());
     }
 
     private void mockAltitudeChange(TrackPointCreator trackPointCreator, float altitudeGain) {
-        AltitudeSumManager altitudeSumManager = trackPointCreator.getAltitudeSumManager();
+        AltitudeSumManager altitudeSumManager = trackPointCreator.getSensorManager().getAltitudeSumManager();
         altitudeSumManager.setAltitudeGain_m(altitudeGain);
         altitudeSumManager.setAltitudeLoss_m(altitudeGain);
     }

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

@@ -231,8 +231,8 @@ public class GPXTrackImporterTest {
         importTrackId = importer.importFile(inputStream).get(0);
         Track importedTrack = contentProviderUtils.getTrack(importTrackId);
 
-        TrackExporter trackExporter = TrackFileFormat.GPX.createTrackExporter(context);
+        TrackExporter trackExporter = TrackFileFormat.GPX.createTrackExporter(context, contentProviderUtils);
-        trackExporter.writeTrack(importedTrack, outputStream);
+        trackExporter.writeTrack(List.of(importedTrack), outputStream);
 
         // then
         String expected = new BufferedReader(

src/androidTest/java/de/dennisguse/opentracks/sensors/UintUtilsTest.java

@@ -11,13 +11,44 @@ public class UintUtilsTest {
         assertEquals(0, UintUtils.diff(1, 1, UintUtils.UINT16_MAX));
         assertEquals(1, UintUtils.diff(2, 1, UintUtils.UINT16_MAX));
         assertEquals(3, UintUtils.diff(5, 2, UintUtils.UINT16_MAX));
-        assertEquals(65534, UintUtils.diff(1, 2, UintUtils.UINT16_MAX));
+        assertEquals(65535, UintUtils.diff(1, 2, UintUtils.UINT16_MAX));     /* unsigned 16 arithmetic is modulo UINT16_MAX + 1, not modulo UINT16_MAX */
-
         assertEquals(65530, UintUtils.diff(UintUtils.UINT16_MAX, 5, UintUtils.UINT16_MAX));
+
+        /*   Test modulo arithmetic for arguments that are out of range */
+
+        if (false) {   /*  false means UintUtils.diff() throws if arguments out of range */
+            assertEquals(0, UintUtils.diff(65537, 1, UintUtils.UINT16_MAX));
+            assertEquals(0, UintUtils.diff(1, 65537, UintUtils.UINT16_MAX));
+            assertEquals(0, UintUtils.diff(65537, 65537, UintUtils.UINT16_MAX));
+            assertEquals(0, UintUtils.diff(-65535, 1, UintUtils.UINT16_MAX));
+            assertEquals(0, UintUtils.diff(1, -65535, UintUtils.UINT16_MAX));
+            assertEquals(0, UintUtils.diff(-65535, -65535, UintUtils.UINT16_MAX));
+            assertEquals(0, UintUtils.diff(-65535, 65537, UintUtils.UINT16_MAX));
+            assertEquals(0, UintUtils.diff(65537, -65535, UintUtils.UINT16_MAX));
+        }
+
+        /*  The following tests are the above, but for 32-bit unsigned. */
+
+        assertEquals(0, UintUtils.diff(1, 1, UintUtils.UINT32_MAX));
+        assertEquals(1, UintUtils.diff(2, 1, UintUtils.UINT32_MAX));
+        assertEquals(3, UintUtils.diff(5, 2, UintUtils.UINT32_MAX));
+        assertEquals(4294967295L, UintUtils.diff(1, 2, UintUtils.UINT32_MAX));
+        assertEquals(4294967290L, UintUtils.diff(UintUtils.UINT32_MAX, 5, UintUtils.UINT32_MAX));
+
+        if (false) { /*  false means UintUtils.diff() throws if arguments out of range */
+            assertEquals(0, UintUtils.diff(4294967297L, 1, UintUtils.UINT32_MAX));
+            assertEquals(0, UintUtils.diff(1, 4294967297L, UintUtils.UINT32_MAX));
+            assertEquals(0, UintUtils.diff(4294967297L, 4294967297L, UintUtils.UINT32_MAX));
+            assertEquals(0, UintUtils.diff(-4294967295L, 1, UintUtils.UINT32_MAX));
+            assertEquals(0, UintUtils.diff(1, -4294967295L, UintUtils.UINT32_MAX));
+            assertEquals(0, UintUtils.diff(-4294967295L, -4294967295L, UintUtils.UINT32_MAX));
+            assertEquals(0, UintUtils.diff(-4294967295L, 4294967297L, UintUtils.UINT32_MAX));
+            assertEquals(0, UintUtils.diff(65537, -4294967297L, UintUtils.UINT32_MAX));
+        }
     }
 
     @Test
     public void realData() {
         assertEquals(1, UintUtils.diff(381616, 381615, UintUtils.UINT32_MAX));
     }
-}
+}

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

@@ -45,6 +45,8 @@ import de.dennisguse.opentracks.stats.TrackStatistics;
 
 /**
  * Tests insert location.
+ * Note: on API23, the TrackRecordingService may not be stopped properly before the next test.
+ * So, if something fails, subsequent tests may be affected.
  */
 @RunWith(AndroidJUnit4.class)
 public class TrackRecordingServiceTestRecording {
@@ -112,7 +114,7 @@ public class TrackRecordingServiceTestRecording {
         String startTime = "2020-02-02T02:02:02Z";
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // then
         assertEquals(new TrackStatistics(startTime, startTime, 0, 0, 0, 0, null, null)
@@ -149,7 +151,7 @@ public class TrackRecordingServiceTestRecording {
 
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // when
         String pauseTime = "2020-02-02T02:02:03Z";
@@ -195,7 +197,7 @@ public class TrackRecordingServiceTestRecording {
         String starTime = "2020-02-02T02:02:02Z";
         trackPointCreator.setClock(starTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         String pauseTime = "2020-02-02T02:02:03Z";
         trackPointCreator.setClock(pauseTime);
@@ -227,7 +229,7 @@ public class TrackRecordingServiceTestRecording {
 
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         String stopTime = "2020-02-02T02:02:03Z";
         trackPointCreator.setClock(stopTime);
@@ -237,7 +239,7 @@ public class TrackRecordingServiceTestRecording {
         String resumeTime = "2020-02-02T02:02:04Z";
         trackPointCreator.setClock(resumeTime);
         service.resumeTrack(trackId);
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // then
         new TrackPointAssert().assertEquals(List.of(
@@ -258,12 +260,13 @@ public class TrackRecordingServiceTestRecording {
 
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
-        BluetoothRemoteSensorManager remoteSensorManager = trackPointCreator.getRemoteSensorManager();
+        BluetoothRemoteSensorManager remoteSensorManager = trackPointCreator.getSensorManager().getBluetoothSensorManager();
 
         // when
         String sensor1 = "2020-02-02T02:02:03Z";
         trackPointCreator.setClock(sensor1);
+
         remoteSensorManager.onChanged(new SensorDataHeartRate("", "", HeartRate.of(5))); //Should be ignored
 
         String sensor3 = "2020-02-02T02:02:13Z";
@@ -297,7 +300,7 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
 
         // when
@@ -371,7 +374,7 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // when
         String gps1 = "2020-02-02T02:02:03Z";
@@ -436,7 +439,7 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // when
         String gps1 = "2020-02-02T02:02:03Z";
@@ -500,7 +503,7 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // when
         String gps1 = "2020-02-02T02:02:03Z";
@@ -564,7 +567,7 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // when
         String gps1 = "2020-02-02T02:02:03Z";
@@ -652,7 +655,7 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // when
         String gps1 = "2020-02-02T02:02:03Z";
@@ -702,7 +705,7 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // when
         String gps1 = "2020-02-02T02:02:03Z";
@@ -748,7 +751,7 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
 
         // when
         String gps1 = "2020-02-02T02:02:03Z";
@@ -812,8 +815,8 @@ public class TrackRecordingServiceTestRecording {
         TrackPointCreator trackPointCreator = service.getTrackPointCreator();
         trackPointCreator.setClock(startTime);
         Track.Id trackId = service.startNewTrack();
-        trackPointCreator.setAltitudeSumManager(altitudeSumManager);
+        trackPointCreator.getSensorManager().setAltitudeSumManager(altitudeSumManager);
-        BluetoothRemoteSensorManager remoteSensorManager = trackPointCreator.getRemoteSensorManager();
+        BluetoothRemoteSensorManager remoteSensorManager = trackPointCreator.getSensorManager().getBluetoothSensorManager();
 
         // when
         String sensor1 = "2020-02-02T02:02:03Z";

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

@@ -1,17 +1,12 @@
 package de.dennisguse.opentracks.services;
 
 import android.content.Context;
-import android.content.Intent;
 import android.location.Location;
 
 import androidx.test.rule.ServiceTestRule;
 
-import org.mockito.Mockito;
-
-import java.time.Clock;
 import java.util.concurrent.TimeoutException;
 
-import de.dennisguse.opentracks.sensors.BluetoothRemoteSensorManager;
 import de.dennisguse.opentracks.services.handlers.TrackPointCreator;
 import de.dennisguse.opentracks.settings.PreferencesUtils;
 
@@ -24,15 +19,6 @@ public class TrackRecordingServiceTestUtils {
     public static void resetService(ServiceTestRule mServiceRule, Context context) throws TimeoutException {
         // Let's use default values.
         PreferencesUtils.clear();
-
-        // Reset service (if some previous test failed)
-        TrackRecordingService service = ((TrackRecordingService.Binder) mServiceRule.bindService(new Intent(context, TrackRecordingService.class)))
-                .getService();
-
-        BluetoothRemoteSensorManager remoteSensorManager = Mockito.mock(BluetoothRemoteSensorManager.class);
-        service.getTrackPointCreator().setRemoteSensorManager(remoteSensorManager);
-        service.getTrackPointCreator().setClock(Clock.systemUTC());
-        service.endCurrentTrack();
     }
 
     static void sendGPSLocation(TrackPointCreator trackPointCreator, String time, double latitude, double longitude, float accuracy, long speed) {

src/androidTest/java/de/dennisguse/opentracks/services/handlers/GPSManagerTest.java

@@ -26,7 +26,7 @@ import de.dennisguse.opentracks.data.models.Distance;
 import de.dennisguse.opentracks.settings.PreferencesUtils;
 
 @RunWith(MockitoJUnitRunner.class)
-public class GPSHandlerTest {
+public class GPSManagerTest {
 
     private final Context context = ApplicationProvider.getApplicationContext();
 
@@ -34,7 +34,7 @@ public class GPSHandlerTest {
     private TrackPointCreator trackPointCreator;
 
     @InjectMocks
-    private GPSHandler locationHandler;
+    private GPSManager locationHandler;
 
     @BeforeClass
     public static void preSetUp() {
@@ -50,7 +50,7 @@ public class GPSHandlerTest {
         Mockito.when(trackPointCreator.createNow())
                 .thenReturn(Instant.now());
 
-        locationHandler.onStart(context, new Handler());
+        locationHandler.start(context, new Handler());
     }
 
     /**

src/androidTest/java/de/dennisguse/opentracks/services/handlers/TrackPointCreatorTest.java

@@ -25,7 +25,7 @@ public class TrackPointCreatorTest {
     private TrackPointCreator.Callback server;
 
     @Mock
-    private GPSHandler locationHandler;
+    private GPSManager locationHandler;
 
     private TrackPointCreator subject;
 

src/androidTest/java/de/dennisguse/opentracks/util/EGM2008UtilsTest.java

@@ -34,23 +34,24 @@ public class EGM2008UtilsTest {
         int expectedLength = 18671444;
         int expectedHeaderLength = 404;
 
-        String expectedHeader = "P5\n" +
+        String expectedHeader = """
-                "# Geoid file in PGM format for the GeographicLib::Geoid class\n" +
+                P5
-                "# Description WGS84 EGM2008, 5-minute grid\n" +
+                # Geoid file in PGM format for the GeographicLib::Geoid class
-                "# URL http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008\n" +
+                # Description WGS84 EGM2008, 5-minute grid
-                "# DateTime 2009-08-29 18:45:00\n" +
+                # URL http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008
-                "# MaxBilinearError 0.478\n" +
+                # DateTime 2009-08-29 18:45:00
-                "# RMSBilinearError 0.012\n" +
+                # MaxBilinearError 0.478
-                "# MaxCubicError 0.294\n" +
+                # RMSBilinearError 0.012
-                "# RMSCubicError 0.005\n" +
+                # MaxCubicError 0.294
-                "# Offset -108\n" +
+                # RMSCubicError 0.005
-                "# Scale 0.003\n" +
+                # Offset -108
-                "# Origin 90N 0E\n" +
+                # Scale 0.003
-                "# AREA_OR_POINT Point\n" +
+                # Origin 90N 0E
-                "# Vertical_Datum WGS84\n" +
+                # AREA_OR_POINT Point
-                "4320    2161\n" +
+                # Vertical_Datum WGS84
-                "65535" +
+                4320    2161
-                "\n";
+                65535
+                """;
 
         // when
         try (InputStream inputStream = context.getResources().openRawResource(EGM2008Utils.EGM2008_5_DATA)) {
@@ -78,7 +79,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
 
         // then
-        assertEquals(-14.8980, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
+        assertEquals(-14.8980, altitude_egm2008.correctAltitude(trackPoint.getLocation()).toM(), MAX_BILINEAR_ERROR);
     }
 
     @Test
@@ -93,7 +94,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
 
         // then
-        assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
+        assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()).toM(), MAX_BILINEAR_ERROR);
     }
 
     @Test
@@ -108,7 +109,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
 
         // then
-        assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
+        assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()).toM(), MAX_BILINEAR_ERROR);
     }
 
     @Test
@@ -123,7 +124,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
 
         // then
-        assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
+        assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()).toM(), MAX_BILINEAR_ERROR);
     }
 
     @Test
@@ -138,7 +139,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
 
         // then
-        assertEquals(-17.2260, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
+        assertEquals(-17.2260, altitude_egm2008.correctAltitude(trackPoint.getLocation()).toM(), MAX_BILINEAR_ERROR);
     }
 
     @Test
@@ -153,7 +154,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
 
         // then
-        assertEquals(-39.4865, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
+        assertEquals(-39.4865, altitude_egm2008.correctAltitude(trackPoint.getLocation()).toM(), MAX_BILINEAR_ERROR);
     }
 
     @Test
@@ -173,7 +174,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint1.getLocation());
 
         // then
-        assertNotEquals(altitude_egm2008.correctAltitude(trackPoint1.getLocation()), altitude_egm2008.correctAltitude(trackPoint2.getLocation()), 0.0001);
+        assertNotEquals(altitude_egm2008.correctAltitude(trackPoint1.getLocation()).toM(), altitude_egm2008.correctAltitude(trackPoint2.getLocation()).toM(), 0.0001);
     }
 
     @Test
@@ -189,7 +190,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
 
         // then
-        assertEquals(22.99, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
+        assertEquals(22.99, altitude_egm2008.correctAltitude(trackPoint.getLocation()).toM(), MAX_BILINEAR_ERROR);
     }
 
     @Test
@@ -204,7 +205,7 @@ public class EGM2008UtilsTest {
         EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
 
         // then
-        assertEquals(-85.824, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
+        assertEquals(-85.824, altitude_egm2008.correctAltitude(trackPoint.getLocation()).toM(), MAX_BILINEAR_ERROR);
     }
 
 

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

@@ -17,11 +17,14 @@ package de.dennisguse.opentracks.util;
 
 import static org.junit.Assert.assertEquals;
 
+import androidx.test.core.app.ApplicationProvider;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.Arrays;
 
 /**
@@ -37,7 +40,7 @@ public class FileUtilsTest {
      */
     @Test
     public void testBuildUniqueFileName_new() {
-        String filename = FileUtils.buildUniqueFileName(new File("/dir"), "Filename", "ext");
+        String filename = FileUtils.buildUniqueFileName(FileUtils.getPhotoDir(ApplicationProvider.getApplicationContext()), "Filename", "ext");
         assertEquals("Filename.ext", filename);
     }
 
@@ -45,9 +48,14 @@ public class FileUtilsTest {
      * Tests {@link FileUtils#buildUniqueFileName(File, String, String)} when the file exists already.
      */
     @Test
-    public void testBuildUniqueFileName_exist() {
+    public void testBuildUniqueFileName_exist() throws IOException {
-        // Expect "/default.prop" to exist on the phone/emulator
+        // given
-        String filename = FileUtils.buildUniqueFileName(new File("/"), "default", "prop");
+        new File(FileUtils.getPhotoDir(ApplicationProvider.getApplicationContext()), "default.prop").createNewFile();
+
+        //when
+        String filename = FileUtils.buildUniqueFileName(FileUtils.getPhotoDir(ApplicationProvider.getApplicationContext()), "default", "prop");
+
+        // then
         assertEquals("default(1).prop", filename);
     }
 

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

@@ -52,8 +52,8 @@ public class StatisticsUtilsTest extends TestCase {
         recordingLayout.addField(new DataField("key5", true, true, false));
 
         // when
-        RecordingLayout resultTrue = StatisticsUtils.filterVisible(recordingLayout, true);
+        RecordingLayout resultTrue = recordingLayout.toRecordingLayout(true);
-        RecordingLayout resultFalse = StatisticsUtils.filterVisible(recordingLayout, false);
+        RecordingLayout resultFalse = recordingLayout.toRecordingLayout(false);
 
         // then
         assertEquals(resultTrue.getFields().size(), 3);

src/main/AndroidManifest.xml

@@ -62,7 +62,9 @@ limitations under the License.
 
     <application
         android:name=".Startup"
-        android:allowBackup="false"
+        android:allowBackup="true"
+        android:fullBackupContent="@xml/backup_rules_30_lower"
+        android:dataExtractionRules="@xml/backup_rules_31_higher"
         android:hardwareAccelerated="true"
         android:hasFragileUserData="false"
         android:icon="@drawable/ic_launcher"
@@ -87,6 +89,7 @@ limitations under the License.
             </intent-filter>
         </activity>
 
+        <!-- NOTE: the name of the MAIN/LAUNCHER is used by icon packs; if this is changed, icon packs break.-->
         <activity
             android:name=".introduction.IntroductionActivity"
             android:exported="true"
@@ -346,6 +349,7 @@ limitations under the License.
         <activity android:name=".ui.aggregatedStatistics.AggregatedStatisticsActivity" />
 
         <activity android:name=".io.file.importer.DirectoryChooserActivity$ExportDirectoryChooserActivity" />
+        <activity android:name=".io.file.importer.DirectoryChooserActivity$ExportDirectoryChooserOneFileActivity" />
         <activity android:name=".io.file.importer.DirectoryChooserActivity$DefaultTrackExportDirectoryChooserActivity" />
 
         <activity android:name=".io.file.exporter.ExportActivity" />

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

@@ -24,6 +24,7 @@ import android.widget.ArrayAdapter;
 import androidx.annotation.NonNull;
 
 import de.dennisguse.opentracks.data.ContentProviderUtils;
+import de.dennisguse.opentracks.data.models.ActivityType;
 import de.dennisguse.opentracks.data.models.Track;
 import de.dennisguse.opentracks.databinding.TrackEditBinding;
 import de.dennisguse.opentracks.fragments.ChooseActivityTypeDialogFragment;
@@ -75,7 +76,7 @@ public class TrackEditActivity extends AbstractActivity implements ChooseActivit
 
         viewBinding.fields.trackEditActivityType.setText(track.getCategory());
 
-        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.activity_types, android.R.layout.simple_dropdown_item_1line);
+        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line, ActivityType.getLocalizedStrings(this));
         viewBinding.fields.trackEditActivityType.setAdapter(adapter);
         viewBinding.fields.trackEditActivityType.setOnItemClickListener((parent, view, position, id) -> setActivityTypeIcon(TrackIconUtils.getIconValue(this, (String) viewBinding.fields.trackEditActivityType.getAdapter().getItem(position))));
         viewBinding.fields.trackEditActivityType.setOnFocusChangeListener((v, hasFocus) -> {

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

@@ -25,7 +25,6 @@ import android.database.Cursor;
 import android.graphics.drawable.AnimatedVectorDrawable;
 import android.location.LocationManager;
 import android.os.Bundle;
-import android.os.Vibrator;
 import android.provider.Settings;
 import android.util.Pair;
 import android.view.KeyEvent;
@@ -246,7 +245,7 @@ public class TrackListActivity extends AbstractTrackDeleteActivity implements Co
             }
 
             // Recording -> Stop
-            ((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).vibrate(1000);
+            ActivityUtils.vibrate(this, 1000);
             updateGpsMenuItem(false, false);
             trackRecordingServiceConnection.stopRecording(TrackListActivity.this);
             viewBinding.trackListFabAction.setImageResource(R.drawable.ic_baseline_record_24);
@@ -311,9 +310,9 @@ public class TrackListActivity extends AbstractTrackDeleteActivity implements Co
         searchMenuItem = menu.findItem(R.id.track_list_search);
         SearchView searchView = ActivityUtils.configureSearchWidget(this, searchMenuItem);
 
-        searchView.findViewById(R.id.search_edit_frame).setPadding(0, 0, 48, 0);
+        searchView.findViewById(androidx.appcompat.R.id.search_edit_frame).setPadding(0, 0, 48, 0);
 
-        SearchView.SearchAutoComplete searchAutoComplete = searchView.findViewById(R.id.search_src_text);
+        SearchView.SearchAutoComplete searchAutoComplete = searchView.findViewById(androidx.appcompat.R.id.search_src_text);
         searchAutoComplete.setHintTextColor(ContextCompat.getColor(this, android.R.color.white));
         searchAutoComplete.setTextColor(ContextCompat.getColor(this, android.R.color.white));
 
@@ -382,6 +381,12 @@ public class TrackListActivity extends AbstractTrackDeleteActivity implements Co
             SearchView searchView = (SearchView) searchMenuItem.getActionView();
             searchView.setIconified(false);
             searchMenuItem.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
+            return true;
+        }
+
+        if (item.getItemId() == R.id.track_list_help) {
+            startActivity(IntentUtils.newIntent(this, HelpActivity.class));
+            return true;
         }
 
         return super.onOptionsItemSelected(item);

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

@@ -274,18 +274,14 @@ public class TrackRecordedActivity extends AbstractTrackDeleteActivity implement
         @NonNull
         @Override
         public Fragment createFragment(int position) {
-            switch (position) {
+            return switch (position) {
-                case 0:
+                case 0 -> StatisticsRecordedFragment.newInstance(trackId);
-                    return StatisticsRecordedFragment.newInstance(trackId);
+                case 1 -> IntervalsFragment.newInstance(trackId, true);
-                case 1:
+                case 2 -> ChartFragment.newInstance(false);
-                    return IntervalsFragment.newInstance(trackId, true);
+                case 3 -> ChartFragment.newInstance(true);
-                case 2:
+                default ->
-                    return ChartFragment.newInstance(false);
+                        throw new RuntimeException("There isn't Fragment associated with the position: " + position);
-                case 3:
+            };
-                    return ChartFragment.newInstance(true);
-                default:
-                    throw new RuntimeException("There isn't Fragment associated with the position: " + position);
-            }
         }
 
         @Override
@@ -294,18 +290,14 @@ public class TrackRecordedActivity extends AbstractTrackDeleteActivity implement
         }
 
         public CharSequence getPageTitle(int position) {
-            switch (position) {
+            return switch (position) {
-                case 0:
+                case 0 -> getString(R.string.track_detail_stats_tab);
-                    return getString(R.string.track_detail_stats_tab);
+                case 1 -> getString(R.string.track_detail_intervals_tab);
-                case 1:
+                case 2 -> getString(R.string.settings_chart_by_time);
-                    return getString(R.string.track_detail_intervals_tab);
+                case 3 -> getString(R.string.settings_chart_by_distance);
-                case 2:
+                default ->
-                    return getString(R.string.settings_chart_by_time);
+                        throw new RuntimeException("There isn't Fragment associated with the position: " + position);
-                case 3:
+            };
-                    return getString(R.string.settings_chart_by_distance);
-                default:
-                    throw new RuntimeException("There isn't Fragment associated with the position: " + position);
-            }
         }
     }
 

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

@@ -1,12 +1,10 @@
 package de.dennisguse.opentracks;
 
 import android.app.AlertDialog;
-import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.os.Build;
 import android.os.Bundle;
-import android.os.Vibrator;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -45,6 +43,7 @@ import de.dennisguse.opentracks.settings.SettingsActivity;
 import de.dennisguse.opentracks.ui.intervals.IntervalsFragment;
 import de.dennisguse.opentracks.ui.markers.MarkerEditActivity;
 import de.dennisguse.opentracks.ui.markers.MarkerListActivity;
+import de.dennisguse.opentracks.ui.util.ActivityUtils;
 import de.dennisguse.opentracks.util.IntentDashboardUtils;
 import de.dennisguse.opentracks.util.IntentUtils;
 import de.dennisguse.opentracks.util.TrackIconUtils;
@@ -137,7 +136,7 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
         viewBinding.trackRecordingFabAction.setBackgroundTintList(ContextCompat.getColorStateList(this, R.color.opentracks_secondary_color));
         viewBinding.trackRecordingFabAction.setBackgroundColor(ContextCompat.getColor(this, R.color.opentracks_secondary_color));
         viewBinding.trackRecordingFabAction.setOnLongClickListener((view) -> {
-            ((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).vibrate(1000);
+            ActivityUtils.vibrate(this, 1000);
             trackRecordingServiceConnection.stopRecording(TrackRecordingActivity.this);
             Intent newIntent = IntentUtils.newIntent(TrackRecordingActivity.this, TrackStoppedActivity.class)
                     .putExtra(TrackStoppedActivity.EXTRA_TRACK_ID, trackId);
@@ -333,18 +332,14 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
         @NonNull
         @Override
         public Fragment createFragment(int position) {
-            switch (position) {
+            return switch (position) {
-                case 0:
+                case 0 -> StatisticsRecordingFragment.newInstance();
-                    return StatisticsRecordingFragment.newInstance();
+                case 1 -> IntervalsFragment.newInstance(trackId, false);
-                case 1:
+                case 2 -> ChartFragment.newInstance(false);
-                    return IntervalsFragment.newInstance(trackId, false);
+                case 3 -> ChartFragment.newInstance(true);
-                case 2:
+                default ->
-                    return ChartFragment.newInstance(false);
+                        throw new RuntimeException("There isn't Fragment associated with the position: " + position);
-                case 3:
+            };
-                    return ChartFragment.newInstance(true);
-                default:
-                    throw new RuntimeException("There isn't Fragment associated with the position: " + position);
-            }
         }
 
         @Override
@@ -353,18 +348,14 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
         }
 
         public CharSequence getPageTitle(int position) {
-            switch (position) {
+            return switch (position) {
-                case 0:
+                case 0 -> getString(R.string.track_detail_stats_tab);
-                    return getString(R.string.track_detail_stats_tab);
+                case 1 -> getString(R.string.track_detail_intervals_tab);
-                case 1:
+                case 2 -> getString(R.string.settings_chart_by_time);
-                    return getString(R.string.track_detail_intervals_tab);
+                case 3 -> getString(R.string.settings_chart_by_distance);
-                case 2:
+                default ->
-                    return getString(R.string.settings_chart_by_time);
+                        throw new RuntimeException("There isn't Fragment associated with the position: " + position);
-                case 3:
+            };
-                    return getString(R.string.settings_chart_by_distance);
-                default:
-                    throw new RuntimeException("There isn't Fragment associated with the position: " + position);
-            }
         }
     }
 
@@ -381,13 +372,18 @@ public class TrackRecordingActivity extends AbstractActivity implements ChooseAc
     }
 
     private void onGpsStatusChanged(GpsStatusValue gpsStatusValue) {
-        if (gpsStatusValue.isGpsStarted() && snackbar != null && snackbar.isShown()) {
+        boolean snackbarShowing = snackbar != null && snackbar.isShown();
-            snackbar.dismiss();
+        if (gpsStatusValue.isGpsStarted()) {
+            if (snackbarShowing) {
+                snackbar.dismiss();
+            }
             return;
         }
-        if (gpsStatusValue != GpsStatusValue.GPS_DISABLED) {
+
+        if (snackbarShowing) {
             return;
         }
+
         snackbar = Snackbar
                 .make(viewBinding.trackRecordingCoordinatorLayout,
                         getString(R.string.gps_recording_status, getString(gpsStatusValue.message), getString(R.string.gps_recording_without_signal)),

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

@@ -8,6 +8,7 @@ import android.view.View;
 import android.widget.ArrayAdapter;
 
 import de.dennisguse.opentracks.data.ContentProviderUtils;
+import de.dennisguse.opentracks.data.models.ActivityType;
 import de.dennisguse.opentracks.data.models.DistanceFormatter;
 import de.dennisguse.opentracks.data.models.SpeedFormatter;
 import de.dennisguse.opentracks.data.models.Track;
@@ -51,7 +52,7 @@ public class TrackStoppedActivity extends AbstractTrackDeleteActivity implements
 
         viewBinding.trackEditActivityType.setText(track.getCategory());
 
-        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.activity_types, android.R.layout.simple_dropdown_item_1line);
+        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_dropdown_item_1line, ActivityType.getLocalizedStrings(this));
         viewBinding.trackEditActivityType.setAdapter(adapter);
         viewBinding.trackEditActivityType.setOnItemClickListener((parent, view, position, id) -> setActivityTypeIcon(TrackIconUtils.getIconValue(this, (String) viewBinding.trackEditActivityType.getAdapter().getItem(position))));
         viewBinding.trackEditActivityType.setOnFocusChangeListener((v, hasFocus) -> {

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

@@ -210,16 +210,11 @@ abstract class ChartValueSeries {
     }
 
     int getTitleId(UnitSystem unitSystem) {
-        switch (unitSystem) {
+        return switch (unitSystem) {
-            case METRIC:
+            case METRIC -> metricTitleId;
-                return metricTitleId;
+            case IMPERIAL -> imperialTitleId;
-            case IMPERIAL:
+            case NAUTICAL_IMPERIAL -> nauticalTitleId;
-                return imperialTitleId;
+        };
-            case NAUTICAL_IMPERIAL:
-                return nauticalTitleId;
-            default:
-                throw new RuntimeException("Not implemented");
-        }
     }
 
     Paint getTitlePaint() {

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

@@ -733,16 +733,11 @@ public class ChartView extends View {
     private String getXAxisLabel() {
         Context context = getContext();
         if (chartByDistance) {
-            switch (unitSystem) {
+            return switch (unitSystem) {
-                case METRIC:
+                case METRIC -> context.getString(R.string.unit_kilometer);
-                    return context.getString(R.string.unit_kilometer);
+                case IMPERIAL -> context.getString(R.string.unit_mile);
-                case IMPERIAL:
+                case NAUTICAL_IMPERIAL -> context.getString(R.string.unit_nautical_mile);
-                    return context.getString(R.string.unit_mile);
+            };
-                case NAUTICAL_IMPERIAL:
-                    return context.getString(R.string.unit_nautical_mile);
-                default:
-                    throw new RuntimeException("Not implemented");
-            }
         } else {
             return context.getString(R.string.description_time);
         }

src/main/java/de/dennisguse/opentracks/data/CustomContentProvider.java

@@ -133,20 +133,12 @@ public class CustomContentProvider extends ContentProvider {
 
     @Override
     public int delete(@NonNull Uri url, String where, String[] selectionArgs) {
-        String table;
+        String table = switch (getUrlType(url)) {
-        switch (getUrlType(url)) {
+            case TRACKPOINTS -> TrackPointsColumns.TABLE_NAME;
-            case TRACKPOINTS:
+            case TRACKS -> TracksColumns.TABLE_NAME;
-                table = TrackPointsColumns.TABLE_NAME;
+            case MARKERS -> MarkerColumns.TABLE_NAME;
-                break;
+            default -> throw new IllegalArgumentException("Unknown URL " + url);
-            case TRACKS:
+        };
-                table = TracksColumns.TABLE_NAME;
-                break;
-            case MARKERS:
-                table = MarkerColumns.TABLE_NAME;
-                break;
-            default:
-                throw new IllegalArgumentException("Unknown URL " + url);
-        }
 
         Log.w(TAG, "Deleting from table " + table);
         int totalChangesBefore = getTotalChanges();
@@ -186,24 +178,15 @@ public class CustomContentProvider extends ContentProvider {
 
     @Override
     public String getType(@NonNull Uri url) {
-        switch (getUrlType(url)) {
+        return switch (getUrlType(url)) {
-            case TRACKPOINTS:
+            case TRACKPOINTS -> TrackPointsColumns.CONTENT_TYPE;
-                return TrackPointsColumns.CONTENT_TYPE;
+            case TRACKPOINTS_BY_ID, TRACKPOINTS_BY_TRACKID -> TrackPointsColumns.CONTENT_ITEMTYPE;
-            case TRACKPOINTS_BY_ID:
+            case TRACKS -> TracksColumns.CONTENT_TYPE;
-            case TRACKPOINTS_BY_TRACKID:
+            case TRACKS_BY_ID -> TracksColumns.CONTENT_ITEMTYPE;
-                return TrackPointsColumns.CONTENT_ITEMTYPE;
+            case MARKERS -> MarkerColumns.CONTENT_TYPE;
-            case TRACKS:
+            case MARKERS_BY_ID, MARKERS_BY_TRACKID -> MarkerColumns.CONTENT_ITEMTYPE;
-                return TracksColumns.CONTENT_TYPE;
+            default -> throw new IllegalArgumentException("Unknown URL " + url);
-            case TRACKS_BY_ID:
+        };
-                return TracksColumns.CONTENT_ITEMTYPE;
-            case MARKERS:
-                return MarkerColumns.CONTENT_TYPE;
-            case MARKERS_BY_ID:
-            case MARKERS_BY_TRACKID:
-                return MarkerColumns.CONTENT_ITEMTYPE;
-            default:
-                throw new IllegalArgumentException("Unknown URL " + url);
-        }
     }
 
     @Override
@@ -251,47 +234,47 @@ public class CustomContentProvider extends ContentProvider {
         SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
         String sortOrder = null;
         switch (getUrlType(url)) {
-            case TRACKPOINTS:
+            case TRACKPOINTS -> {
                 queryBuilder.setTables(TrackPointsColumns.TABLE_NAME);
                 sortOrder = sort != null ? sort : TrackPointsColumns.DEFAULT_SORT_ORDER;
-                break;
+            }
-            case TRACKPOINTS_BY_ID:
+            case TRACKPOINTS_BY_ID -> {
                 queryBuilder.setTables(TrackPointsColumns.TABLE_NAME);
                 queryBuilder.appendWhere(TrackPointsColumns._ID + "=" + ContentUris.parseId(url));
-                break;
+            }
-            case TRACKPOINTS_BY_TRACKID:
+            case TRACKPOINTS_BY_TRACKID -> {
                 queryBuilder.setTables(TrackPointsColumns.TABLE_NAME);
                 queryBuilder.appendWhere(TrackPointsColumns.TRACKID + " IN (" + TextUtils.join(SQL_LIST_DELIMITER, ContentProviderUtils.parseTrackIdsFromUri(url)) + ")");
-                break;
+            }
-            case TRACKS:
+            case TRACKS -> {
                 if (projection != null && Arrays.asList(projection).contains(TracksColumns.MARKER_COUNT)) {
                     queryBuilder.setTables(TracksColumns.TABLE_NAME + " LEFT OUTER JOIN (SELECT " + MarkerColumns.TRACKID + " AS markerTrackId, COUNT(*) AS " + TracksColumns.MARKER_COUNT + " FROM " + MarkerColumns.TABLE_NAME + " GROUP BY " + MarkerColumns.TRACKID + ") ON (" + TracksColumns.TABLE_NAME + "." + TracksColumns._ID + "= markerTrackId)");
                 } else {
                     queryBuilder.setTables(TracksColumns.TABLE_NAME);
                 }
                 sortOrder = sort != null ? sort : TracksColumns.DEFAULT_SORT_ORDER;
-                break;
+            }
-            case TRACKS_BY_ID:
+            case TRACKS_BY_ID -> {
                 queryBuilder.setTables(TracksColumns.TABLE_NAME);
                 queryBuilder.appendWhere(TracksColumns._ID + " IN (" + TextUtils.join(SQL_LIST_DELIMITER, ContentProviderUtils.parseTrackIdsFromUri(url)) + ")");
-                break;
+            }
-            case TRACKS_SENSOR_STATS:
+            case TRACKS_SENSOR_STATS -> {
                 long trackId = ContentUris.parseId(url);
                 return db.rawQuery(SENSOR_STATS_QUERY, new String[]{String.valueOf(trackId), String.valueOf(trackId)});
-            case MARKERS:
+            }
+            case MARKERS -> {
                 queryBuilder.setTables(MarkerColumns.TABLE_NAME);
                 sortOrder = sort != null ? sort : MarkerColumns.DEFAULT_SORT_ORDER;
-                break;
+            }
-            case MARKERS_BY_ID:
+            case MARKERS_BY_ID -> {
                 queryBuilder.setTables(MarkerColumns.TABLE_NAME);
                 queryBuilder.appendWhere(MarkerColumns._ID + "=" + ContentUris.parseId(url));
-                break;
+            }
-            case MARKERS_BY_TRACKID:
+            case MARKERS_BY_TRACKID -> {
                 queryBuilder.setTables(MarkerColumns.TABLE_NAME);
                 queryBuilder.appendWhere(MarkerColumns.TRACKID + " IN (" + TextUtils.join(SQL_LIST_DELIMITER, ContentProviderUtils.parseTrackIdsFromUri(url)) + ")");
-                break;
+            }
-            default:
+            default -> throw new IllegalArgumentException("Unknown url " + url);
-                throw new IllegalArgumentException("Unknown url " + url);
         }
         Cursor cursor = queryBuilder.query(db, projection, selection, selectionArgs, null, null, sortOrder);
         cursor.setNotificationUri(getContext().getContentResolver(), url);
@@ -304,41 +287,40 @@ public class CustomContentProvider extends ContentProvider {
         String table;
         String whereClause;
         switch (getUrlType(url)) {
-            case TRACKPOINTS:
+            case TRACKPOINTS -> {
                 table = TrackPointsColumns.TABLE_NAME;
                 whereClause = where;
-                break;
+            }
-            case TRACKPOINTS_BY_ID:
+            case TRACKPOINTS_BY_ID -> {
                 table = TrackPointsColumns.TABLE_NAME;
                 whereClause = TrackPointsColumns._ID + "=" + ContentUris.parseId(url);
                 if (!TextUtils.isEmpty(where)) {
                     whereClause += " AND (" + where + ")";
                 }
-                break;
+            }
-            case TRACKS:
+            case TRACKS -> {
                 table = TracksColumns.TABLE_NAME;
                 whereClause = where;
-                break;
+            }
-            case TRACKS_BY_ID:
+            case TRACKS_BY_ID -> {
                 table = TracksColumns.TABLE_NAME;
                 whereClause = TracksColumns._ID + "=" + ContentUris.parseId(url);
                 if (!TextUtils.isEmpty(where)) {
                     whereClause += " AND (" + where + ")";
                 }
-                break;
+            }
-            case MARKERS:
+            case MARKERS -> {
                 table = MarkerColumns.TABLE_NAME;
                 whereClause = where;
-                break;
+            }
-            case MARKERS_BY_ID:
+            case MARKERS_BY_ID -> {
                 table = MarkerColumns.TABLE_NAME;
                 whereClause = MarkerColumns._ID + "=" + ContentUris.parseId(url);
                 if (!TextUtils.isEmpty(where)) {
                     whereClause += " AND (" + where + ")";
                 }
-                break;
+            }
-            default:
+            default -> throw new IllegalArgumentException("Unknown url " + url);
-                throw new IllegalArgumentException("Unknown url " + url);
         }
         int count;
         try {
@@ -371,16 +353,12 @@ public class CustomContentProvider extends ContentProvider {
      * @param contentValues the content values
      */
     private Uri insertContentValues(Uri url, UrlType urlType, ContentValues contentValues) {
-        switch (urlType) {
+        return switch (urlType) {
-            case TRACKPOINTS:
+            case TRACKPOINTS -> insertTrackPoint(url, contentValues);
-                return insertTrackPoint(url, contentValues);
+            case TRACKS -> insertTrack(url, contentValues);
-            case TRACKS:
+            case MARKERS -> insertMarker(url, contentValues);
-                return insertTrack(url, contentValues);
+            default -> throw new IllegalArgumentException("Unknown url " + url);
-            case MARKERS:
+        };
-                return insertMarker(url, contentValues);
-            default:
-                throw new IllegalArgumentException("Unknown url " + url);
-        }
     }
 
     private Uri insertTrackPoint(Uri url, ContentValues values) {

src/main/java/de/dennisguse/opentracks/data/CustomSQLiteOpenHelper.java

@@ -61,42 +61,18 @@ public class CustomSQLiteOpenHelper extends SQLiteOpenHelper {
         for (int toVersion = oldVersion + 1; toVersion <= newVersion; toVersion++) {
             Log.i(TAG, "Upgrade from " + oldVersion + " to " + toVersion);
             switch (toVersion) {
-                case 24:
+                case 24 -> upgradeFrom23to24(db);
-                    upgradeFrom23to24(db);
+                case 25 -> upgradeFrom24to25(db);
-                    break;
+                case 26 -> upgradeFrom25to26(db);
-                case 25:
+                case 27 -> upgradeFrom26to27(db);
-                    upgradeFrom24to25(db);
+                case 28 -> upgradeFrom27to28(db);
-                    break;
+                case 29 -> upgradeFrom28to29(db);
-                case 26:
+                case 30 -> upgradeFrom29to30(db);
-                    upgradeFrom25to26(db);
+                case 31 -> upgradeFrom30to31(db);
-                    break;
+                case 32 -> upgradeFrom31to32(db);
-                case 27:
+                case 33 -> upgradeFrom32to33(db);
-                    upgradeFrom26to27(db);
+                case 34 -> upgradeFrom33to34(db);
-                    break;
+                default -> throw new RuntimeException("Not implemented: upgrade to " + toVersion);
-                case 28:
-                    upgradeFrom27to28(db);
-                    break;
-                case 29:
-                    upgradeFrom28to29(db);
-                    break;
-                case 30:
-                    upgradeFrom29to30(db);
-                    break;
-                case 31:
-                    upgradeFrom30to31(db);
-                    break;
-                case 32:
-                    upgradeFrom31to32(db);
-                    break;
-                case 33:
-                    upgradeFrom32to33(db);
-                    break;
-                case 34:
-                    upgradeFrom33to34(db);
-                    break;
-
-                default:
-                    throw new RuntimeException("Not implemented: upgrade to " + toVersion);
             }
         }
     }
@@ -106,41 +82,18 @@ public class CustomSQLiteOpenHelper extends SQLiteOpenHelper {
         for (int toVersion = oldVersion - 1; toVersion >= newVersion; toVersion--) {
             Log.i(TAG, "Downgrade from " + oldVersion + " to " + toVersion);
             switch (toVersion) {
-                case 23:
+                case 23 -> downgradeFrom24to23(db);
-                    downgradeFrom24to23(db);
+                case 24 -> downgradeFrom25to24(db);
-                    break;
+                case 25 -> downgradeFrom26to25(db);
-                case 24:
+                case 26 -> downgradeFrom27to26(db);
-                    downgradeFrom25to24(db);
+                case 27 -> downgradeFrom28to27(db);
-                    break;
+                case 28 -> downgradeFrom29to28(db);
-                case 25:
+                case 29 -> downgradeFrom30to29(db);
-                    downgradeFrom26to25(db);
+                case 30 -> downgradeFrom31to30(db);
-                    break;
+                case 31 -> downgradeFrom32to31(db);
-                case 26:
+                case 32 -> downgradeFrom33to32(db);
-                    downgradeFrom27to26(db);
+                case 33 -> downgradeFrom34to33(db);
-                    break;
+                default -> throw new RuntimeException("Not implemented: downgrade to " + toVersion);
-                case 27:
-                    downgradeFrom28to27(db);
-                    break;
-                case 28:
-                    downgradeFrom29to28(db);
-                    break;
-                case 29:
-                    downgradeFrom30to29(db);
-                    break;
-                case 30:
-                    downgradeFrom31to30(db);
-                    break;
-                case 31:
-                    downgradeFrom32to31(db);
-                    break;
-                case 32:
-                    downgradeFrom33to32(db);
-                    break;
-                case 33:
-                    downgradeFrom34to33(db);
-                    break;
-                default:
-                    throw new RuntimeException("Not implemented: downgrade to " + toVersion);
             }
         }
     }

src/main/java/de/dennisguse/opentracks/data/ShareContentProvider.java

@@ -129,24 +129,18 @@ public class ShareContentProvider extends CustomContentProvider {
     }
 
     private static TrackFileFormat getTrackFileFormat(@NonNull Uri uri) {
-        switch (uriMatcher.match(uri)) {
+        return switch (uriMatcher.match(uri)) {
-            case URI_GPX:
+            case URI_GPX -> TrackFileFormat.GPX;
-                return TrackFileFormat.GPX;
+            case URI_KML_WITH_TRACKDETAIL_SENSORDATA ->
-
+                    TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA;
-            case URI_KML_WITH_TRACKDETAIL_SENSORDATA:
+            case URI_KMZ_WITH_TRACKDETAIL_AND_SENSORDATA ->
-                return TrackFileFormat.KML_WITH_TRACKDETAIL_AND_SENSORDATA;
+                    TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA;
-
+            case URI_KMZ_WITH_TRACKDETAIL_SENSORDATA_AND_PICTURES ->
-            case URI_KMZ_WITH_TRACKDETAIL_AND_SENSORDATA:
+                    TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA_AND_PICTURES;
-                return TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA;
+            case URI_CSV -> TrackFileFormat.CSV;
-            case URI_KMZ_WITH_TRACKDETAIL_SENSORDATA_AND_PICTURES:
+            default ->
-                return TrackFileFormat.KMZ_WITH_TRACKDETAIL_AND_SENSORDATA_AND_PICTURES;
+                    throw new RuntimeException("Could not derive TrackFileFormat from Uri " + uri);
-
+        };
-            case URI_CSV:
-                return TrackFileFormat.CSV;
-
-            default:
-                throw new RuntimeException("Could not derive TrackFileFormat from Uri " + uri);
-        }
     }
 
     @Nullable
@@ -170,14 +164,14 @@ public class ShareContentProvider extends CustomContentProvider {
         int i = 0;
         for (String col : projection) {
             switch (col) {
-                case OpenableColumns.DISPLAY_NAME:
+                case OpenableColumns.DISPLAY_NAME -> {
                     cols[i] = OpenableColumns.DISPLAY_NAME;
                     values[i++] = uri.getLastPathSegment();
-                    break;
+                }
-                case OpenableColumns.SIZE:
+                case OpenableColumns.SIZE -> {
                     cols[i] = OpenableColumns.SIZE;
                     values[i++] = -1; //Report unknown size; if applications need to know, one need to generate the file here also (count bytes that are written to OutputStream.
-                    break;
+                }
             }
         }
 
@@ -214,12 +208,12 @@ public class ShareContentProvider extends CustomContentProvider {
             }
         }
 
-        final TrackExporter trackExporter = getTrackFileFormat(uri).createTrackExporter(getContext());
+        final TrackExporter trackExporter = getTrackFileFormat(uri).createTrackExporter(getContext(), new ContentProviderUtils(getContext()));
 
         PipeDataWriter<String> pipeDataWriter = (output, uri1, mimeType, opts, args) -> {
             try (FileOutputStream fileOutputStream = new FileOutputStream(output.getFileDescriptor())) {
                 // TODO handle failure (i.e., do not export an empty file)
-                trackExporter.writeTrack(tracks.toArray(new Track[0]), fileOutputStream);
+                trackExporter.writeTrack(tracks, fileOutputStream);
             } catch (IOException e) {
                 Log.w(TAG, "there occurred an error while sharing a file: " + e);
             }

src/main/java/de/dennisguse/opentracks/data/models/ActivityType.java

@@ -0,0 +1,79 @@
+package de.dennisguse.opentracks.data.models;
+
+import android.content.Context;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import de.dennisguse.opentracks.R;
+
+public enum ActivityType {
+    AIRPLANE("AIRPLANE", R.drawable.ic_activity_flight_24dp, true, R.string.activity_type_airplane, R.string.activity_type_commercial_airplane, R.string.activity_type_rc_airplane),
+    BIKE("BIKE", R.drawable.ic_activity_bike_24dp, true, R.string.activity_type_biking, R.string.activity_type_cycling, R.string.activity_type_dirt_bike, R.string.activity_type_road_biking, R.string.activity_type_track_cycling),
+    MOUNTAIN_BIKE("MOUNTAIN_BIKE", R.drawable.ic_activity_mtb_24dp, true, R.string.activity_type_mountain_biking),
+    MOTOR_BIKE("MOTOR_BIKE", R.drawable.ic_activity_motorbike_24dp, true, R.string.activity_type_motor_bike),
+    KAYAK("KAYAK", R.drawable.ic_activity_kayaking_24dp, true, R.string.activity_type_kayaking),
+    BOAT("BOAT", R.drawable.ic_activity_boat_24dp, true, R.string.activity_type_boat, R.string.activity_type_ferry, R.string.activity_type_motor_boating, R.string.activity_type_rc_boat),
+    SAILING("SAILING", R.drawable.ic_activity_sailing_24dp, true, R.string.activity_type_sailing),
+    DRIVE("DRIVE", R.drawable.ic_activity_drive_24dp, true, R.string.activity_type_atv, R.string.activity_type_driving, R.string.activity_type_driving_bus, R.string.activity_type_driving_car),
+    RUN("RUN", R.drawable.ic_activity_run_24dp, false, R.string.activity_type_running, R.string.activity_type_street_running, R.string.activity_type_track_running, R.string.activity_type_trail_running),
+    SKI("SKI", R.drawable.ic_activity_skiing_24dp, true, R.string.activity_type_cross_country_skiing, R.string.activity_type_skiing),
+    SNOW_BOARDING("SNOW_BOARDING", R.drawable.ic_activity_snowboarding_24dp, true, R.string.activity_type_snow_boarding),
+    UNKNOWN("UNKNOWN", R.drawable.ic_logo_24dp, true, R.string.activity_type_unknown),
+    WALK("WALK", R.drawable.ic_activity_walk_24dp, false, R.string.activity_type_hiking, R.string.activity_type_off_trail_hiking, R.string.activity_type_speed_walking, R.string.activity_type_trail_hiking, R.string.activity_type_walking),
+    ESCOOTER("ESCOOTER", R.drawable.ic_activity_escooter_24dp, true, R.string.activity_type_escooter),
+    INLINE_SKATING("INLINES_SKATING", R.drawable.ic_activity_inline_skating_24dp, true, R.string.activity_type_inline_skating),
+    SKATE_BOARDING("SKATE_BOARDING", R.drawable.ic_activity_skateboarding_24dp, true, R.string.activity_type_skate_boarding),
+    CLIMBING("CLIMBING", R.drawable.ic_activity_climbing_24dp, false, R.string.activity_type_climbing),
+    SWIMMING("SWIMMING", R.drawable.ic_activity_swimming_24dp, false, R.string.activity_type_swimming),
+    SWIMMING_OPEN("SWIMMING_OPEN", R.drawable.ic_activity_swimming_open_24dp, false, R.string.activity_type_swimming_open),
+    WORKOUT("WORKOUT", R.drawable.ic_activity_workout_24dp, false, R.string.activity_type_workout);
+
+    final String id;
+    final int iconId;
+    final boolean showSpeedPreferred;
+    final int[] localizedStringIds;
+
+    //isSpeed?
+
+    ActivityType(String id, int iconId, boolean showSpeedPreferred, int... localizedStringIds) {
+        this.id = id;
+        this.iconId = iconId;
+        this.showSpeedPreferred = showSpeedPreferred;
+        this.localizedStringIds = localizedStringIds;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public int getIconId() {
+        return iconId;
+    }
+
+    public boolean isShowSpeedPreferred() {
+        return showSpeedPreferred;
+    }
+
+    public int[] getLocalizedStringIds() {
+        return localizedStringIds;
+    }
+
+    public int getFirstLocalizedStringId() {
+        return localizedStringIds[0];
+    }
+
+    public static List<String> getLocalizedStrings(Context context) {
+        List<String> result = new ArrayList<>();
+        for (ActivityType activityType : values()) {
+            List<String> strings = Arrays.stream(activityType.localizedStringIds)
+                    .mapToObj(context::getString)
+                    .collect(Collectors.toList());
+            result.addAll(strings);
+        }
+
+        return result;
+    }
+}

src/main/java/de/dennisguse/opentracks/data/models/Altitude.java

@@ -15,9 +15,7 @@ public abstract class Altitude {
     public double toM() {
         return altitude_m;
     }
-
+    
-    public abstract Altitude replace(double altitude_m);
-
     public abstract int getLabelId();
 
     public static class WGS84 extends Altitude {
@@ -31,12 +29,7 @@ public abstract class Altitude {
             return R.string.wgs84;
         }
 
-        public static Altitude of(double altitude_m) {
+        public static WGS84 of(double altitude_m) {
-            return new WGS84(altitude_m);
-        }
-
-        @Override
-        public Altitude replace(double altitude_m) {
             return new WGS84(altitude_m);
         }
     }
@@ -52,12 +45,7 @@ public abstract class Altitude {
             return R.string.egm2008;
         }
 
-        public static Altitude of(double altitude_m) {
+        public static EGM2008 of(double altitude_m) {
-            return new EGM2008(altitude_m);
-        }
-
-        @Override
-        public Altitude replace(double altitude_m) {
             return new EGM2008(altitude_m);
         }
     }

src/main/java/de/dennisguse/opentracks/data/models/BatteryLevel.java

@@ -0,0 +1,18 @@
+package de.dennisguse.opentracks.data.models;
+
+public class BatteryLevel {
+
+    public static BatteryLevel of(int percentage) {
+        return new BatteryLevel(percentage);
+    }
+
+    private final int percentage;
+
+    private BatteryLevel(int percentage) {
+        this.percentage = percentage;
+    }
+
+    public int getPercentage() {
+        return percentage;
+    }
+}

src/main/java/de/dennisguse/opentracks/data/models/Distance.java

@@ -58,16 +58,11 @@ public class Distance {
     }
 
     public static Distance one(UnitSystem unitSystem) {
-        switch (unitSystem) {
+        return switch (unitSystem) {
-            case METRIC:
+            case METRIC -> Distance.ofKilometer(1);
-                return Distance.ofKilometer(1);
+            case IMPERIAL -> Distance.ofMile(1);
-            case IMPERIAL:
+            case NAUTICAL_IMPERIAL -> Distance.ofNauticalMile(1);
-                return Distance.ofMile(1);
+        };
-            case NAUTICAL_IMPERIAL:
-                return Distance.ofNauticalMile(1);
-            default:
-                throw new RuntimeException("Not implemented");
-        }
     }
 
     private final double distance_m;
@@ -133,28 +128,18 @@ public class Distance {
     }
 
     public double toKM_Miles(UnitSystem unitSystem) {
-        switch (unitSystem) {
+        return switch (unitSystem) {
-            case METRIC:
+            case METRIC -> toKM();
-                return toKM();
+            case IMPERIAL -> toMI();
-            case IMPERIAL:
+            case NAUTICAL_IMPERIAL -> toNauticalMiles();
-                return toMI();
+        };
-            case NAUTICAL_IMPERIAL:
-                return toNauticalMiles();
-            default:
-                throw new RuntimeException("Not implemented");
-        }
     }
 
     public double toM_FT(UnitSystem unitSystem) {
-        switch (unitSystem) {
+        return switch (unitSystem) {
-            case METRIC:
+            case METRIC -> toM();
-                return toM();
+            case NAUTICAL_IMPERIAL, IMPERIAL -> toFT();
-            case NAUTICAL_IMPERIAL:
+        };
-            case IMPERIAL:
-                return toFT();
-            default:
-                throw new RuntimeException("Not implemented");
-        }
     }
 
     @Override

src/main/java/de/dennisguse/opentracks/data/models/DistanceFormatter.java

@@ -46,38 +46,36 @@ public class DistanceFormatter {
     public Pair<String, String> getDistanceParts(Distance distance) {
         if (distance.isInvalid()) {
             String valueUnknown = resources.getString(R.string.value_unknown);
-            switch (unitSystem) {
+            return switch (unitSystem) {
-                case METRIC:
+                case METRIC -> new Pair<>(valueUnknown, resources.getString(R.string.unit_meter));
-                    return new Pair<>(valueUnknown, resources.getString(R.string.unit_meter));
+                case IMPERIAL, NAUTICAL_IMPERIAL ->
-                case IMPERIAL:
+                        new Pair<>(valueUnknown, resources.getString(R.string.unit_feet));
-                case NAUTICAL_IMPERIAL:
+            };
-                    return new Pair<>(valueUnknown, resources.getString(R.string.unit_feet));
-                default:
-                    throw new RuntimeException("Not implemented");
-            }
         }
 
         switch (unitSystem) {
-            case METRIC:
+            case METRIC -> {
                 if (distance.greaterThan(Distance.ofKilometer(threshold))) {
                     return new Pair<>(StringUtils.formatDecimal(distance.toKM(), decimalCount), resources.getString(R.string.unit_kilometer));
                 } else {
                     return new Pair<>(StringUtils.formatDecimal(distance.toM(), decimalCount), resources.getString(R.string.unit_meter));
                 }
-            case IMPERIAL:
+            }
+            case IMPERIAL -> {
                 if (distance.greaterThan(Distance.ofMile(threshold))) {
                     return new Pair<>(StringUtils.formatDecimal(distance.toMI(), decimalCount), resources.getString(R.string.unit_mile));
                 } else {
                     return new Pair<>(StringUtils.formatDecimal(distance.toFT(), decimalCount), resources.getString(R.string.unit_feet));
                 }
-            case NAUTICAL_IMPERIAL:
+            }
+            case NAUTICAL_IMPERIAL -> {
                 if (distance.greaterThan(Distance.ofNauticalMile(threshold))) {
                     return new Pair<>(StringUtils.formatDecimal(distance.toNauticalMiles(), decimalCount), resources.getString(R.string.unit_nautical_mile));
                 } else {
                     return new Pair<>(StringUtils.formatDecimal(distance.toFT(), decimalCount), resources.getString(R.string.unit_feet));
                 }
-            default:
+            }
-                throw new RuntimeException("Not implemented");
+            default -> throw new RuntimeException("Not implemented");
         }
     }
 

src/main/java/de/dennisguse/opentracks/data/models/HeartRateZones.java

@@ -1,8 +1,12 @@
 package de.dennisguse.opentracks.data.models;
 
+import android.content.Context;
+
 import androidx.annotation.NonNull;
+import androidx.core.content.ContextCompat;
 
 import de.dennisguse.opentracks.R;
+import de.dennisguse.opentracks.ui.util.ThemeUtils;
 
 public class HeartRateZones {
 
@@ -12,22 +16,23 @@ public class HeartRateZones {
         this.max = max;
     }
 
-    public int getColorForZone(HeartRate current) {
+    public int getTextColorForZone(Context context, HeartRate current) {
         if (current != null) {
             if (current.getBPM() >= max.getBPM() * 0.9) {
-                return R.color.heart_rate_zone_textcolor_5;
+                return ContextCompat.getColor(context, R.color.heart_rate_zone_textcolor_5);
             }
             if (current.getBPM() >= max.getBPM() * 0.8) {
-                return R.color.heart_rate_zone_textcolor_4;
+                return ContextCompat.getColor(context, R.color.heart_rate_zone_textcolor_4);
             }
             if (current.getBPM() >= max.getBPM() * 0.7) {
-                return R.color.heart_rate_zone_textcolor_3;
+                return ContextCompat.getColor(context, R.color.heart_rate_zone_textcolor_3);
             }
             if (current.getBPM() >= max.getBPM() * 0.6) {
-                return R.color.heart_rate_zone_textcolor_2;
+                return ContextCompat.getColor(context, R.color.heart_rate_zone_textcolor_2);
             }
         }
 
-        return R.color.heart_rate_zone_textcolor_1;
+        // Zone 1
+        return ThemeUtils.getTextColorPrimary(context);
     }
 }

src/main/java/de/dennisguse/opentracks/data/models/Speed.java

@@ -115,16 +115,11 @@ public class Speed {
     }
 
     public double to(UnitSystem unitSystem) {
-        switch (unitSystem) {
+        return switch (unitSystem) {
-            case METRIC:
+            case METRIC -> toKMH();
-                return toKMH();
+            case IMPERIAL -> toMPH();
-            case IMPERIAL:
+            case NAUTICAL_IMPERIAL -> toKnots();
-                return toMPH();
+        };
-            case NAUTICAL_IMPERIAL:
-                return toKnots();
-            default:
-                throw new RuntimeException("Not implemented");
-        }
     }
 
     @Override

src/main/java/de/dennisguse/opentracks/data/models/SpeedFormatter.java

@@ -39,20 +39,14 @@ public class SpeedFormatter {
      * @return the formatted speed (or null) and it's unit as {@link Pair}
      */
     public Pair<String, String> getSpeedParts(Speed speed) {
-        int unitId;
+        int unitId = switch (unitSystem) {
-        switch (unitSystem) {
+            case METRIC ->
-            case METRIC:
+                    reportSpeedOrPace ? R.string.unit_kilometer_per_hour : R.string.unit_minute_per_kilometer;
-                unitId = reportSpeedOrPace ? R.string.unit_kilometer_per_hour : R.string.unit_minute_per_kilometer;
+            case IMPERIAL ->
-                break;
+                    reportSpeedOrPace ? R.string.unit_mile_per_hour : R.string.unit_minute_per_mile;
-            case IMPERIAL:
+            case NAUTICAL_IMPERIAL ->
-                unitId = reportSpeedOrPace ? R.string.unit_mile_per_hour : R.string.unit_minute_per_mile;
+                    reportSpeedOrPace ? R.string.unit_knots : R.string.unit_minute_per_nautical_mile;
-                break;
+        };
-            case NAUTICAL_IMPERIAL:
-                unitId = reportSpeedOrPace ? R.string.unit_knots : R.string.unit_minute_per_nautical_mile;
-                break;
-            default:
-                throw new RuntimeException("Not implemented");
-        }
 
         String unitString = resources.getString(unitId);
 

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

@@ -122,17 +122,15 @@ public class StatisticsRecordingFragment extends Fragment {
         }
         recordingLayout = newRecordingLayout;
 
-        viewBinding.statsLayout.setColumnCount(recordingLayout.getColumnsPerRow());
-
         viewBinding.statsLayout.removeAllViews(); //Let's start from scratch
+        viewBinding.statsLayout.setColumnCount(recordingLayout.getColumnsPerRow());
         viewHolders.clear();
 
         Map<String, Callable<StatisticViewHolder<?>>> m = Mapping.create(getContext());
 
         int rowIndex = 0;
         int columnIndex = 0;
-        for (int i = 0; i < recordingLayout.getFields().size(); i++) {
+        for (DataField dataField : recordingLayout.toRecordingLayout(true).getFields()) {
-            DataField dataField = recordingLayout.getFields().get(i);
             GridLayout.LayoutParams param = new GridLayout.LayoutParams();
             param.setGravity(Gravity.FILL_HORIZONTAL);
             param.width = 0;
@@ -162,7 +160,7 @@ public class StatisticsRecordingFragment extends Fragment {
 
                 viewBinding.statsLayout.addView(viewHolder.getView(), param);
             } catch (Exception e) {
-                throw new RuntimeException(e);
+                throw new RuntimeException("Could not add " + dataField.getKey(), e);
             }
         }
     }

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

@@ -3,6 +3,8 @@ package de.dennisguse.opentracks.io.file;
 import android.content.Context;
 import android.content.res.Resources;
 
+import androidx.annotation.NonNull;
+
 import java.util.Arrays;
 import java.util.LinkedHashMap;
 import java.util.Locale;
@@ -25,8 +27,8 @@ public enum TrackFileFormat {
 
     KML_WITH_TRACKDETAIL_AND_SENSORDATA("KML_WITH_TRACKDETAIL_AND_SENSORDATA") {
         @Override
-        public TrackExporter createTrackExporter(Context context) {
+        public TrackExporter createTrackExporter(@NonNull Context context, @NonNull ContentProviderUtils contentProviderUtils) {
-            return new KMLTrackExporter(context, false);
+            return new KMLTrackExporter(context, contentProviderUtils, false);
         }
 
         @Override
@@ -45,9 +47,9 @@ public enum TrackFileFormat {
         private static final boolean exportPhotos = false;
 
         @Override
-        public TrackExporter createTrackExporter(Context context) {
+        public TrackExporter createTrackExporter(@NonNull Context context, @NonNull ContentProviderUtils contentProviderUtils) {
-            KMLTrackExporter exporter = new KMLTrackExporter(context, exportPhotos);
+            KMLTrackExporter exporter = new KMLTrackExporter(context, contentProviderUtils, exportPhotos);
-            return new KmzTrackExporter(context, new ContentProviderUtils(context), exporter, exportPhotos);
+            return new KmzTrackExporter(context, contentProviderUtils, exporter, exportPhotos);
         }
 
         @Override
@@ -70,9 +72,9 @@ public enum TrackFileFormat {
         private static final boolean exportPhotos = true;
 
         @Override
-        public TrackExporter createTrackExporter(Context context) {
+        public TrackExporter createTrackExporter(@NonNull Context context, @NonNull ContentProviderUtils contentProviderUtils) {
-            KMLTrackExporter exporter = new KMLTrackExporter(context, exportPhotos);
+            KMLTrackExporter exporter = new KMLTrackExporter(context, contentProviderUtils, exportPhotos);
-            return new KmzTrackExporter(context, new ContentProviderUtils(context), exporter, exportPhotos);
+            return new KmzTrackExporter(context, contentProviderUtils, exporter, exportPhotos);
         }
 
         @Override
@@ -93,8 +95,8 @@ public enum TrackFileFormat {
 
     GPX("GPX") {
         @Override
-        public TrackExporter createTrackExporter(Context context) {
+        public TrackExporter createTrackExporter(@NonNull Context context, @NonNull ContentProviderUtils contentProviderUtils) {
-            return new GPXTrackExporter(new ContentProviderUtils(context), context.getString(R.string.app_name));
+            return new GPXTrackExporter(contentProviderUtils, context.getString(R.string.app_name));
         }
 
         @Override
@@ -109,8 +111,8 @@ public enum TrackFileFormat {
 
     CSV("CSV") {
         @Override
-        public TrackExporter createTrackExporter(Context context) {
+        public TrackExporter createTrackExporter(@NonNull Context context, @NonNull ContentProviderUtils contentProviderUtils) {
-            return new CSVTrackExporter(new ContentProviderUtils(context));
+            return new CSVTrackExporter(contentProviderUtils);
         }
 
         @Override
@@ -161,7 +163,7 @@ public enum TrackFileFormat {
      *
      * @param context the context
      */
-    public abstract TrackExporter createTrackExporter(Context context);
+    public abstract TrackExporter createTrackExporter(@NonNull Context context, @NonNull ContentProviderUtils contentProviderUtils);
 
     /**
      * Returns the file extension for each format.

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

@@ -29,6 +29,10 @@ public class TrackFilenameGenerator {
                 .collect(Collectors.joining(", "));
     }
 
+    public static String format(@NonNull String name, @NonNull TrackFileFormat trackFileFormat) {
+        return FileUtils.sanitizeFileName(name + "." + trackFileFormat.getExtension());
+    }
+
     private final String template;
 
     public TrackFilenameGenerator(@NonNull String template) {
@@ -44,7 +48,7 @@ public class TrackFilenameGenerator {
         values.put(STARTTIME_TIME_KEY, track.getStartTime().toLocalTime().toString());
         values.put(STARTTIME_DATE_KEY, track.getStartTime().toLocalDate().toString());
 
-        return FileUtils.sanitizeFileName(format(template, values)) + "." + trackFileFormat.getExtension();
+        return format(format(template, values), trackFileFormat);
     }
 
     private static String format(String template, Map<String, String> values) {
@@ -77,10 +81,6 @@ public class TrackFilenameGenerator {
         return String.format(templateCompiled, valueList.toArray());
     }
 
-    public String getTemplate() {
-        return template;
-    }
-
     public boolean isValid() {
         try {
             getExample();

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

@@ -23,8 +23,6 @@ import androidx.annotation.NonNull;
 import java.io.OutputStream;
 import java.io.PrintWriter;
 import java.text.NumberFormat;
-import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
 import java.util.function.Function;
@@ -87,13 +85,8 @@ public class CSVTrackExporter implements TrackExporter {
     }
 
     @Override
-    public boolean writeTrack(Track track, @NonNull OutputStream outputStream) {
+    public boolean writeTrack(@NonNull List<Track> tracks, @NonNull OutputStream outputStream) {
-        return writeTrack(new Track[]{track}, outputStream);
+        List<Column> columns = List.of(
-    }
-
-    @Override
-    public boolean writeTrack(Track[] tracks, @NonNull OutputStream outputStream) {
-        List<Column> columns = Collections.unmodifiableList(Arrays.asList(
                 new Column("time", null),
                 new Column("trackpoint_type", t -> quote(t.getType().name())),
                 new Column("latitude", t -> t.hasLocation() ? COORDINATE_FORMAT.format(t.getLatitude()) : ""),
@@ -108,8 +101,7 @@ public class CSVTrackExporter implements TrackExporter {
                 new Column("sensor_distance", t -> t.hasSensorDistance() ? DISTANCE_FORMAT.format(t.getSensorDistance().toM()) : ""),
                 new Column("heartrate", t -> t.hasHeartRate() ? HEARTRATE_FORMAT.format(t.getHeartRate().getBPM()) : ""),
                 new Column("cadence", t -> t.hasCadence() ? CADENCE_FORMAT.format(t.getCadence().getRPM()) : ""),
-                new Column("power", t -> t.hasPower() ? ALTITUDE_FORMAT.format(t.getPower().getW()) : "")
+                new Column("power", t -> t.hasPower() ? ALTITUDE_FORMAT.format(t.getPower().getW()) : ""));
-        ));
 
         try {
             prepare(outputStream);
@@ -144,15 +136,10 @@ public class CSVTrackExporter implements TrackExporter {
                 TrackPoint trackPoint = trackPointIterator.next();
 
                 switch (trackPoint.getType()) {
-                    case SEGMENT_START_MANUAL:
+                    case SEGMENT_START_MANUAL, SEGMENT_END_MANUAL, SEGMENT_START_AUTOMATIC, SENSORPOINT, TRACKPOINT ->
-                    case SEGMENT_END_MANUAL:
+                            writeTrackPoint(columns, trackPoint);
-                    case SEGMENT_START_AUTOMATIC:
+                    default ->
-                    case SENSORPOINT:
+                            throw new RuntimeException("Exporting this TrackPoint type is not implemented: " + trackPoint.getType());
-                    case TRACKPOINT:
-                        writeTrackPoint(columns, trackPoint);
-                        break;
-                    default:
-                        throw new RuntimeException("Exporting this TrackPoint type is not implemented: " + trackPoint.getType());
                 }
             }
         }
@@ -171,18 +158,14 @@ public class CSVTrackExporter implements TrackExporter {
 
     public void writeHeader(List<Column> columns) {
         if (printWriter != null) {
-            String columnNames = columns.stream().map(c -> c.columnName)
+            String columnNames = columns.stream().map(c -> c.columnName).reduce((s, s2) -> s + "," + s2).orElseThrow(() -> new RuntimeException("No columns defined"));
-                    .reduce((s, s2) -> s + "," + s2)
-                    .orElseThrow(() -> new RuntimeException("No columns defined"));
             printWriter.println("#" + columnNames);
         }
     }
 
     public void writeTrackPoint(List<Column> columns, TrackPoint trackPoint) {
         if (printWriter != null) {
-            String columnNames = columns.stream().map(c -> c.extractor.apply(trackPoint))
+            String columnNames = columns.stream().map(c -> c.extractor.apply(trackPoint)).reduce((s, s2) -> s + "," + s2).orElseThrow(() -> new RuntimeException("No columns defined"));
-                    .reduce((s, s2) -> s + "," + s2)
-                    .orElseThrow(() -> new RuntimeException("No columns defined"));
             printWriter.println(columnNames);
         }
     }

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

@@ -16,7 +16,6 @@
 
 package de.dennisguse.opentracks.io.file.exporter;
 
-import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
@@ -24,6 +23,7 @@ import android.view.View;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.core.content.ContextCompat;
 import androidx.documentfile.provider.DocumentFile;
 import androidx.fragment.app.FragmentActivity;
@@ -31,14 +31,15 @@ import androidx.fragment.app.FragmentActivity;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.LinkedBlockingQueue;
+import java.util.stream.Collectors;
 
 import de.dennisguse.opentracks.R;
 import de.dennisguse.opentracks.data.ContentProviderUtils;
 import de.dennisguse.opentracks.data.models.Track;
-import de.dennisguse.opentracks.data.tables.TracksColumns;
 import de.dennisguse.opentracks.databinding.ExportActivityBinding;
 import de.dennisguse.opentracks.io.file.ErrorListDialog;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
+import de.dennisguse.opentracks.io.file.TrackFilenameGenerator;
 import de.dennisguse.opentracks.settings.PreferencesUtils;
 import de.dennisguse.opentracks.util.ExportUtils;
 import de.dennisguse.opentracks.util.FileUtils;
@@ -47,12 +48,20 @@ import de.dennisguse.opentracks.util.FileUtils;
  * An activity for saving tracks to the external storage.
  *
  * @author Rodrigo Damazio
+ * TODO: This class needs some refactoring.
+ * * It pushes each export job (usually one Track) for export; although export could be run in parallel.
+ *   Also this requires that the ExportActivity stays in foreground, so the user has to activily wait.
+ *   It would be better to let the ExportService handle this and let it report progress / conflicts to ExportActivity
+ * * File name conflicts are checked in this class instead of the ExportService.
+ *    So, for this check actually a different file name might be used than in the ExportService.
+ * * Saved state as an object instead of individual values.
  */
 public class ExportActivity extends FragmentActivity implements ExportServiceResultReceiver.Receiver {
 
     private static final String TAG = ExportActivity.class.getSimpleName();
 
     public static final String EXTRA_DIRECTORY_URI_KEY = "directory_uri";
+    public static final String EXTRA_ONE_FILE_KEY = "one_file";
     public static final String EXTRA_TRACKFILEFORMAT_KEY = "trackfileformat";
 
     private static final String BUNDLE_AUTO_CONFLICT = "auto_conflict";
@@ -64,9 +73,13 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
     private static final String BUNDLE_DIRECTORY_FILES = "track_directory_files";
     private static final String BUNDLE_TRACK_ERRORS = "track_errors";
 
-    private static final int CONFLICT_NONE = 0;
+    private static final String BUNDLE_EXPORT_TASKS = "export_tasks";
-    private static final int CONFLICT_OVERWRITE = 1;
+
-    private static final int CONFLICT_SKIP = 2;
+    private enum ConflictResolutionStrategy {
+        CONFLICT_NONE,
+        CONFLICT_OVERWRITE,
+        CONFLICT_SKIP;
+    }
 
     private TrackFileFormat trackFileFormat;
     private Uri directoryUri;
@@ -87,12 +100,12 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
 
     private ArrayList<String> trackErrors = new ArrayList<>();
 
-    private int autoConflict;
+    private ConflictResolutionStrategy autoConflict;
 
     private ContentProviderUtils contentProviderUtils;
 
     // List of tracks to be exported.
-    private final ArrayList<Track> tracks = new ArrayList<>();
+    private ArrayList<ExportTask> exportTasks;
 
     private final LinkedBlockingQueue<PendingConflict> conflictsQueue = new LinkedBlockingQueue<>();
     private final Handler conflictsHandler = new Handler();
@@ -100,34 +113,36 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
     private final Runnable conflictsRunnable = new Runnable() {
         @Override
         public void run() {
-            if (conflictsQueue.size() > 0) {
+            if (conflictsQueue.isEmpty()) {
-                PendingConflict conflict = conflictsQueue.peek();
+                return;
-                if (conflict.resolve()) {
-                    conflictsQueue.remove(conflict);
-                    if (!conflictsQueue.isEmpty()) {
-                        conflictsHandler.post(conflictsRunnable);
-                    }
-                    return;
-                }
-
-                viewBinding.exportProgressLeftButton.setOnClickListener((view) -> {
-                    setConflictVisibility(View.GONE);
-                    conflict.skip();
-                    conflictsQueue.remove(conflict);
-                    if (!conflictsQueue.isEmpty()) {
-                        conflictsHandler.post(conflictsRunnable);
-                    }
-                });
-
-                viewBinding.exportProgressRightButton.setOnClickListener((view) -> {
-                    setConflictVisibility(View.GONE);
-                    conflict.overwrite();
-                    conflictsQueue.remove(conflict);
-                    if (!conflictsQueue.isEmpty()) {
-                        conflictsHandler.post(conflictsRunnable);
-                    }
-                });
             }
+
+            PendingConflict conflict = conflictsQueue.peek();
+            if (conflict.resolve()) {
+                conflictsQueue.remove(conflict);
+                if (!conflictsQueue.isEmpty()) {
+                    conflictsHandler.post(conflictsRunnable);
+                }
+                return;
+            }
+
+            viewBinding.exportProgressLeftButton.setOnClickListener((view) -> {
+                setConflictVisibility(View.GONE);
+                conflict.skip();
+                conflictsQueue.remove(conflict);
+                if (!conflictsQueue.isEmpty()) {
+                    conflictsHandler.post(conflictsRunnable);
+                }
+            });
+
+            viewBinding.exportProgressRightButton.setOnClickListener((view) -> {
+                setConflictVisibility(View.GONE);
+                conflict.overwrite();
+                conflictsQueue.remove(conflict);
+                if (!conflictsQueue.isEmpty()) {
+                    conflictsHandler.post(conflictsRunnable);
+                }
+            });
         }
     };
 
@@ -139,6 +154,7 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
 
         directoryUri = getIntent().getParcelableExtra(EXTRA_DIRECTORY_URI_KEY);
         trackFileFormat = (TrackFileFormat) getIntent().getSerializableExtra(EXTRA_TRACKFILEFORMAT_KEY);
+        boolean allInOneFile = getIntent().getBooleanExtra(EXTRA_ONE_FILE_KEY, false);
 
         contentProviderUtils = new ContentProviderUtils(this);
 
@@ -148,14 +164,17 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
         resultReceiver = new ExportServiceResultReceiver(new Handler(), this);
 
         if (savedInstanceState == null) {
-            autoConflict = CONFLICT_NONE;
+            autoConflict = ConflictResolutionStrategy.CONFLICT_NONE;
             setProgress();
             new Thread(() -> {
                 directoryFiles = ExportUtils.getAllFiles(ExportActivity.this, documentFile.getUri());
-                runOnUiThread(() -> initExport(0));
+                runOnUiThread(() -> {
+                    createExportTasks(allInOneFile);
+                    nextExport(null);
+                });
             }).start();
         } else {
-            autoConflict = savedInstanceState.getInt(BUNDLE_AUTO_CONFLICT);
+            autoConflict = ConflictResolutionStrategy.valueOf(savedInstanceState.getString(BUNDLE_AUTO_CONFLICT));
             trackExportSuccessCount = savedInstanceState.getInt(BUNDLE_SUCCESS_COUNT);
             trackExportErrorCount = savedInstanceState.getInt(BUNDLE_ERROR_COUNT);
             trackExportOverwrittenCount = savedInstanceState.getInt(BUNDLE_OVERWRITTEN_COUNT);
@@ -163,9 +182,9 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
             trackExportTotalCount = savedInstanceState.getInt(BUNDLE_TOTAL_COUNT);
             directoryFiles = savedInstanceState.getStringArrayList(BUNDLE_DIRECTORY_FILES);
             trackErrors = savedInstanceState.getStringArrayList(BUNDLE_TRACK_ERRORS);
-
+            exportTasks = new ArrayList<>(savedInstanceState.getParcelableArrayList(BUNDLE_EXPORT_TASKS));
             setProgress();
-            initExport(getTotalDone());
+            nextExport(null);
         }
 
         viewBinding.bottomAppBarLayout.bottomAppBarTitle.setText(getString(R.string.export_progress_message, directoryDisplayName));
@@ -175,7 +194,7 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
     @Override
     protected void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
-        outState.putInt(BUNDLE_AUTO_CONFLICT, autoConflict);
+        outState.putString(BUNDLE_AUTO_CONFLICT, autoConflict.name());
         outState.putInt(BUNDLE_SUCCESS_COUNT, trackExportSuccessCount);
         outState.putInt(BUNDLE_ERROR_COUNT, trackExportErrorCount);
         outState.putInt(BUNDLE_OVERWRITTEN_COUNT, trackExportOverwrittenCount);
@@ -183,13 +202,14 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
         outState.putInt(BUNDLE_TOTAL_COUNT, trackExportTotalCount);
         outState.putStringArrayList(BUNDLE_DIRECTORY_FILES, (ArrayList<String>) directoryFiles);
         outState.putStringArrayList(BUNDLE_TRACK_ERRORS, trackErrors);
+        outState.putParcelableArrayList(BUNDLE_EXPORT_TASKS, exportTasks);
     }
 
     @Override
     protected void onDestroy() {
         super.onDestroy();
         conflictsQueue.clear();
-        tracks.clear();
+        exportTasks.clear();
     }
 
     @Override
@@ -202,57 +222,50 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
         this.doubleBackToCancel = true;
         Toast.makeText(this, getString(R.string.generic_click_twice_cancel), Toast.LENGTH_SHORT).show();
 
-        new Handler().postDelayed(() -> doubleBackToCancel=false, 2000);
+        new Handler().postDelayed(() -> doubleBackToCancel = false, 2000);
     }
 
-    private void initExport(int from) {
+    private void createExportTasks(boolean allInOneFile) {
-        try (Cursor cursor = contentProviderUtils.getTrackCursor(null, null, TracksColumns._ID)) {
+        List<Track> tracks = contentProviderUtils.getTracks();
-            if (cursor == null) {
+        exportTasks = new ArrayList<>();
-                onExportEnded();
+        if (allInOneFile) {
-                return;
+            String filename = "OpenTracks-Backup";
-            }
+            exportTasks.add(new ExportTask(filename, trackFileFormat, tracks.stream().map(Track::getId).collect(Collectors.toList())));
-
+        } else {
-            trackExportTotalCount = cursor.getCount();
+            exportTasks.addAll(tracks.stream().map(it -> new ExportTask(null, trackFileFormat, List.of(it.getId()))).collect(Collectors.toList()));
-            viewBinding.exportProgressTotal.setText("" + trackExportTotalCount);
-            for (int i = from; i < trackExportTotalCount; i++) {
-                cursor.moveToPosition(i);
-                Track track = ContentProviderUtils.createTrack(cursor);
-                tracks.add(track);
-            }
-
-            if (!tracks.isEmpty()) {
-                export(tracks.get(0));
-            } else {
-                onExportEnded();
-            }
         }
+        trackExportTotalCount = exportTasks.size();
     }
 
     /**
      * Enqueue track identified by UUID to be exported if not exported already or there is a conflict resolution.
-     *
-     * @param track              Track object.
-     * @param conflictResolution conflict resolution to be applied if needed.
      */
-    private void export(Track track, int conflictResolution) {
+    private void export(ExportTask exportTask, ConflictResolutionStrategy conflictResolution) {
-        boolean fileExists = exportFileExists(track);
+        boolean fileExists = exportFileExists(exportTask);
 
-        if (fileExists && conflictResolution == CONFLICT_NONE) {
+        if (fileExists && conflictResolution == ConflictResolutionStrategy.CONFLICT_NONE) {
-            conflict(track);
+            conflict(exportTask);
-        } else if (fileExists && conflictResolution == CONFLICT_SKIP) {
+        } else if (fileExists && conflictResolution == ConflictResolutionStrategy.CONFLICT_SKIP) {
             trackExportSkippedCount++;
-            onExportCompleted(track);
+            nextExport(exportTask);
         } else {
-            ExportService.enqueue(this, resultReceiver, track.getId(), trackFileFormat, directoryUri);
+            ExportService.enqueue(this, resultReceiver, exportTask, directoryUri);
         }
     }
 
-    private void export(Track track) {
+    private void export(ExportTask exportTask) {
-        export(track, autoConflict);
+        export(exportTask, autoConflict);
     }
 
-    private boolean exportFileExists(Track track) {
+    @Deprecated //TODO Check should be done in ExportService
-        String filename = PreferencesUtils.getTrackFileformatGenerator().format(track, trackFileFormat);
+    private boolean exportFileExists(ExportTask exportTask) {
+        String filename;
+        if (exportTask.isMultiExport()) {
+            filename = TrackFilenameGenerator.format(exportTask.getFilename(), exportTask.getTrackFileFormat());
+        } else {
+            Track track = contentProviderUtils.getTrack(exportTask.getTrackIds().get(0));
+            filename = PreferencesUtils.getTrackFileformatGenerator().format(track, trackFileFormat);
+        }
         return directoryFiles.stream().anyMatch(filename::equals);
     }
 
@@ -269,31 +282,29 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
     }
 
     private void setProgress() {
-        int done = getTotalDone();
+        viewBinding.exportProgressDone.setText("" + getTotalDone());
-
-        viewBinding.exportProgressDone.setText("" + done);
         viewBinding.exportProgressTotal.setText("" + trackExportTotalCount);
 
-        viewBinding.exportProgressBar.setProgress((int) ((float) done / (float) trackExportTotalCount * 100f));
+        viewBinding.exportProgressBar.setProgress((int) ((float) getTotalDone() / (float) trackExportTotalCount * 100f));
-        viewBinding.exportProgressSummaryNew.setText(String.valueOf(trackExportSuccessCount));
+        viewBinding.exportProgressSummaryNew.setText("" + trackExportSuccessCount);
-        viewBinding.exportProgressSummaryOverwrite.setText(String.valueOf(trackExportOverwrittenCount));
+        viewBinding.exportProgressSummaryOverwrite.setText("" + trackExportOverwrittenCount);
-        viewBinding.exportProgressSummarySkip.setText(String.valueOf(trackExportSkippedCount));
+        viewBinding.exportProgressSummarySkip.setText("" + trackExportSkippedCount);
-        viewBinding.exportProgressSummaryErrors.setText(String.valueOf(trackExportErrorCount));
+        viewBinding.exportProgressSummaryErrors.setText("" + trackExportErrorCount);
         viewBinding.exportProgressSummaryNewGroup.setVisibility(trackExportSuccessCount > 0 ? View.VISIBLE : View.GONE);
         viewBinding.exportProgressSummaryOverwriteGroup.setVisibility(trackExportOverwrittenCount > 0 ? View.VISIBLE : View.GONE);
         viewBinding.exportProgressSummarySkipGroup.setVisibility(trackExportSkippedCount > 0 ? View.VISIBLE : View.GONE);
         viewBinding.exportProgressSummaryErrorsGroup.setVisibility(trackExportErrorCount > 0 ? View.VISIBLE : View.GONE);
     }
 
-    private void onExportCompleted(Track track) {
+    private void nextExport(@Nullable ExportTask exportTask) {
-        tracks.remove(track);
+        exportTasks.remove(exportTask);
 
         setProgress();
-        if (tracks.isEmpty()) {
+        if (exportTasks.isEmpty()) {
             onExportEnded();
             return;
         }
-        export(tracks.get(0));
+        export(exportTasks.get(0));
     }
 
     private void onExportEnded() {
@@ -318,30 +329,32 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
     }
 
     @Override
-    public void onExportSuccess(Track.Id trackId) {
+    public void onExportSuccess(ExportTask exportTask) {
-        Track track = contentProviderUtils.getTrack(trackId);
+        if (exportFileExists(exportTask)) {
-
-        if (exportFileExists(track)) {
             trackExportOverwrittenCount++;
         } else {
             trackExportSuccessCount++;
         }
 
-        onExportCompleted(track);
+        nextExport(exportTask);
     }
 
     @Override
-    public void onExportError(Track.Id trackId) {
+    public void onExportError(ExportTask exportTask) {
-        Track track = contentProviderUtils.getTrack(trackId);
-
         trackExportErrorCount++;
-        trackErrors.add(track.getName());
+        String name;
+        if (exportTask.isMultiExport()) {
+            name = exportTask.getFilename();
+        } else {
+            name = contentProviderUtils.getTrack(exportTask.getTrackIds().get(0)).getName();
+        }
+        trackErrors.add(name);
 
-        onExportCompleted(track);
+        nextExport(exportTask);
     }
 
-    private void conflict(Track track) {
+    private void conflict(ExportTask exportTask) {
-        PendingConflict newConflict = new PendingConflict(track);
+        PendingConflict newConflict = new PendingConflict(exportTask);
         conflictsQueue.add(newConflict);
 
         if (conflictsQueue.size() == 1) {
@@ -353,10 +366,10 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
      * Handle conflicts (exporting file already exists).
      */
     private class PendingConflict {
-        private final Track track;
+        private final ExportTask exportTask;
 
-        public PendingConflict(Track track) {
+        public PendingConflict(ExportTask exportTask) {
-            this.track = track;
+            this.exportTask = exportTask;
         }
 
         /**
@@ -366,14 +379,20 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
          * @return true if it could resolve the conflict or false otherwise.
          */
         public boolean resolve() {
-            if (autoConflict == CONFLICT_NONE) {
+            if (autoConflict == ConflictResolutionStrategy.CONFLICT_NONE) {
                 viewBinding.exportProgressAlertIcon.setImageDrawable(ContextCompat.getDrawable(ExportActivity.this, R.drawable.ic_report_problem_24));
-                viewBinding.exportProgressAlertMsg.setText(getString(R.string.export_track_already_exists_msg, track.getName()));
+                String name;
+                if (exportTask.isMultiExport()) {
+                    name = exportTask.getFilename();
+                } else {
+                    name = contentProviderUtils.getTrack(exportTask.getTrackIds().get(0)).getName();
+                }
+                viewBinding.exportProgressAlertMsg.setText(getString(R.string.export_track_already_exists_msg, name));
                 setConflictVisibility(View.VISIBLE);
                 return false;
             }
 
-            export(track);
+            export(exportTask);
             return true;
         }
 
@@ -381,10 +400,10 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
          * Overwrite the export file and set the autoConflict if user set the "do it for all" switch button.
          */
         public void overwrite() {
-            export(track, CONFLICT_OVERWRITE);
+            export(exportTask, ConflictResolutionStrategy.CONFLICT_OVERWRITE);
 
             if (viewBinding.exportProgressApplyToAll.isChecked()) {
-                autoConflict = CONFLICT_OVERWRITE;
+                autoConflict = ConflictResolutionStrategy.CONFLICT_OVERWRITE;
             }
         }
 
@@ -392,10 +411,10 @@ public class ExportActivity extends FragmentActivity implements ExportServiceRes
          * Skip the export file and set the autoConflict if user set the "do it for all" switch button.
          */
         public void skip() {
-            export(track, CONFLICT_SKIP);
+            export(exportTask, ConflictResolutionStrategy.CONFLICT_SKIP);
 
             if (viewBinding.exportProgressApplyToAll.isChecked()) {
-                autoConflict = CONFLICT_SKIP;
+                autoConflict = ConflictResolutionStrategy.CONFLICT_SKIP;
             }
         }
     }

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

@@ -12,6 +12,9 @@ import androidx.annotation.NonNull;
 import androidx.core.app.JobIntentService;
 import androidx.documentfile.provider.DocumentFile;
 
+import java.util.List;
+import java.util.stream.Collectors;
+
 import de.dennisguse.opentracks.data.ContentProviderUtils;
 import de.dennisguse.opentracks.data.models.Track;
 import de.dennisguse.opentracks.io.file.TrackFileFormat;
@@ -22,16 +25,14 @@ public class ExportService extends JobIntentService {
     private static final int JOB_ID = 1;
 
     private static final String EXTRA_RECEIVER = "extra_receiver";
-    private static final String EXTRA_TRACK_ID = "extra_track_id";
+    private static final String EXTRA_EXPORT_TASK = "export_task";
-    private static final String EXTRA_TRACK_FILE_FORMAT = "extra_track_file_format";
     private static final String EXTRA_DIRECTORY_URI = "extra_directory_uri";
     private static final String TAG = ExportService.class.getSimpleName();
 
-    public static void enqueue(Context context, ExportServiceResultReceiver receiver, Track.Id trackId, TrackFileFormat trackFileFormat, Uri directoryUri) {
+    public static void enqueue(Context context, ExportServiceResultReceiver receiver, ExportTask exportTask, Uri directoryUri) {
         Intent intent = new Intent(context, JobService.class);
         intent.putExtra(EXTRA_RECEIVER, receiver);
-        intent.putExtra(EXTRA_TRACK_ID, trackId);
+        intent.putExtra(EXTRA_EXPORT_TASK, exportTask);
-        intent.putExtra(EXTRA_TRACK_FILE_FORMAT, trackFileFormat);
         intent.putExtra(EXTRA_DIRECTORY_URI, directoryUri);
         enqueueWork(context, ExportService.class, JOB_ID, intent);
     }
@@ -40,13 +41,12 @@ public class ExportService extends JobIntentService {
     protected void onHandleWork(@NonNull Intent intent) {
         // Get all data.
         ResultReceiver resultReceiver = intent.getParcelableExtra(EXTRA_RECEIVER);
-        Track.Id trackId = intent.getParcelableExtra(EXTRA_TRACK_ID);
+        ExportTask exportTask = intent.getParcelableExtra(EXTRA_EXPORT_TASK);
-        TrackFileFormat trackFileFormat = (TrackFileFormat) intent.getSerializableExtra(EXTRA_TRACK_FILE_FORMAT);
         Uri directoryUri = intent.getParcelableExtra(EXTRA_DIRECTORY_URI);
 
         // Prepare resultCode and bundle to send to the receiver.
         Bundle bundle = new Bundle();
-        bundle.putParcelable(ExportServiceResultReceiver.RESULT_EXTRA_TRACK_ID, trackId);
+        bundle.putParcelable(ExportServiceResultReceiver.RESULT_EXTRA_EXPORT_TASK, exportTask);
 
         // Build directory file.
         DocumentFile directoryFile = DocumentFile.fromTreeUri(this, directoryUri);
@@ -57,9 +57,7 @@ public class ExportService extends JobIntentService {
         }
 
         // Export.
-        ContentProviderUtils contentProviderUtils = new ContentProviderUtils(this);
+        boolean success = ExportUtils.exportTrack(this, directoryFile, exportTask);
-        Track track = contentProviderUtils.getTrack(trackId);
-        boolean success = ExportUtils.exportTrack(this, trackFileFormat, directoryFile, track);
 
         // Send result to the receiver.
         int resultCode = success ? ExportServiceResultReceiver.RESULT_CODE_SUCCESS : ExportServiceResultReceiver.RESULT_CODE_ERROR;

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

@@ -17,7 +17,7 @@ public class ExportServiceResultReceiver extends ResultReceiver {
     public static final int RESULT_CODE_SUCCESS = 1;
     public static final int RESULT_CODE_ERROR = 0;
 
-    public static final String RESULT_EXTRA_TRACK_ID = "result_extra_track_id";
+    public static final String RESULT_EXTRA_EXPORT_TASK = "result_extra_export_task";
 
     private final Receiver receiver;
 
@@ -28,24 +28,19 @@ public class ExportServiceResultReceiver extends ResultReceiver {
 
     @Override
     protected void onReceiveResult(int resultCode, Bundle resultData) {
-        Track.Id trackId = resultData.getParcelable(ExportServiceResultReceiver.RESULT_EXTRA_TRACK_ID);
+        ExportTask exportTask = resultData.getParcelable(ExportServiceResultReceiver.RESULT_EXTRA_EXPORT_TASK);
         switch (resultCode) {
-            case RESULT_CODE_SUCCESS:
+            case RESULT_CODE_SUCCESS -> receiver.onExportSuccess(exportTask);
-                receiver.onExportSuccess(trackId);
+            case RESULT_CODE_ERROR -> receiver.onExportError(exportTask);
-                break;
+            default -> throw new RuntimeException("Unknown resultCode.");
-            case RESULT_CODE_ERROR:
-                receiver.onExportError(trackId);
-                break;
-            default:
-                throw new RuntimeException("Unknown resultCode.");
         }
     }
 
     public interface Receiver {
-        default void onExportSuccess(Track.Id trackId) {
+        default void onExportSuccess(ExportTask exportTask) {
         }
 
-        default void onExportError(Track.Id trackId) {
+        default void onExportError(ExportTask exportTask) {
         }
     }
 }

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

@@ -0,0 +1,87 @@
+package de.dennisguse.opentracks.io.file.exporter;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.util.List;
+import java.util.Objects;
+
+import de.dennisguse.opentracks.data.models.Track;
+import de.dennisguse.opentracks.io.file.TrackFileFormat;
+
+public class ExportTask implements Parcelable {
+
+    private final String filename; //TODO Name will only be used when exporting multiple tracks
+
+    private final TrackFileFormat trackFileFormat;
+
+    private final List<Track.Id> trackIds;
+
+    public ExportTask(@Nullable String filename, @NonNull TrackFileFormat trackFileFormat, @NonNull List<Track.Id> trackIds) {
+        this.filename = filename;
+        this.trackFileFormat = trackFileFormat;
+        this.trackIds = trackIds;
+    }
+
+    protected ExportTask(Parcel in) {
+        filename = in.readString();
+        trackFileFormat = TrackFileFormat.valueOf(in.readString());
+        trackIds = in.createTypedArrayList(Track.Id.CREATOR);
+    }
+
+    public String getFilename() {
+        return filename;
+    }
+
+    public TrackFileFormat getTrackFileFormat() {
+        return trackFileFormat;
+    }
+
+    public List<Track.Id> getTrackIds() {
+        return trackIds;
+    }
+
+    public boolean isMultiExport() {
+        return trackIds.size() > 1;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ExportTask that = (ExportTask) o;
+        return Objects.equals(filename, that.filename) && trackFileFormat == that.trackFileFormat && Objects.equals(trackIds, that.trackIds);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(filename, trackFileFormat, trackIds);
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeString(filename);
+        dest.writeString(trackFileFormat.name());
+        dest.writeTypedList(trackIds);
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    public static final Creator<ExportTask> CREATOR = new Creator<>() {
+        @Override
+        public ExportTask createFromParcel(Parcel in) {
+            return new ExportTask(in);
+        }
+
+        @Override
+        public ExportTask[] newArray(int size) {
+            return new ExportTask[size];
+        }
+    };
+}

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

@@ -98,12 +98,7 @@ public class GPXTrackExporter implements TrackExporter {
     }
 
     @Override
-    public boolean writeTrack(Track track, @NonNull OutputStream outputStream) {
+    public boolean writeTrack(List<Track> tracks, @NonNull OutputStream outputStream) {
-        return writeTrack(new Track[]{track}, outputStream);
-    }
-
-    @Override
-    public boolean writeTrack(Track[] tracks, @NonNull OutputStream outputStream) {
         try {
             prepare(outputStream);
             writeHeader();
@@ -145,37 +140,32 @@ public class GPXTrackExporter implements TrackExporter {
                 }
 
                 switch (trackPoint.getType()) {
-                    case SEGMENT_START_MANUAL:
+                    case SEGMENT_START_MANUAL ->
-                        Log.i(TAG, "Exporting " + TrackPoint.Type.SEGMENT_START_MANUAL.name() + " is not supported.");
+                            Log.i(TAG, "Exporting " + TrackPoint.Type.SEGMENT_START_MANUAL.name() + " is not supported.");
-                        break;
+                    case SEGMENT_END_MANUAL -> {
-                    case SEGMENT_END_MANUAL:
                         if (wroteSegment) writeCloseSegment();
                         wroteSegment = false;
                         Log.i(TAG, "Exporting " + TrackPoint.Type.SEGMENT_END_MANUAL.name() + " is not supported.");
-                        break;
+                    }
-                    case SEGMENT_START_AUTOMATIC:
+                    case SEGMENT_START_AUTOMATIC -> {
                         if (wroteSegment) writeCloseSegment();
                         writeOpenSegment();
                         wroteSegment = true;
-
                         trackDistance = trackDistance.plus(writeTrackPoint(track.getZoneOffset(), trackPoint, sensorPoints, trackDistance));
                         sensorPoints.clear();
-                        break;
+                    }
-                    case SENSORPOINT:
+                    case SENSORPOINT -> sensorPoints.add(trackPoint);
-                        sensorPoints.add(trackPoint);
+                    case TRACKPOINT -> {
-                        break;
-                    case TRACKPOINT:
                         if (!wroteSegment) {
                             // Might happen for older data (pre v3.15.0)
                             writeOpenSegment();
                             wroteSegment = true;
                         }
-
                         trackDistance = trackDistance.plus(writeTrackPoint(track.getZoneOffset(), trackPoint, sensorPoints, trackDistance));
                         sensorPoints.clear();
-                        break;
+                    }
-                    default:
+                    default ->
-                        throw new RuntimeException("Exporting this TrackPoint type is not implemented: " + trackPoint.getType());
+                            throw new RuntimeException("Exporting this TrackPoint type is not implemented: " + trackPoint.getType());
                 }
             }
 

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

@@ -93,24 +93,20 @@ public class KMLTrackExporter implements TrackExporter {
     private final List<Float> accuracyHorizontal = new ArrayList<>();
     private final List<Float> accuracyVertical = new ArrayList<>();
 
-    public KMLTrackExporter(Context context, boolean exportPhotos) {
+    public KMLTrackExporter(Context context, ContentProviderUtils contentProviderUtils, boolean exportPhotos) {
         this.context = context;
         this.exportPhotos = exportPhotos;
-        this.contentProviderUtils = new ContentProviderUtils(context);
+        this.contentProviderUtils = contentProviderUtils;
     }
 
-    public boolean writeTrack(Track track, @NonNull OutputStream outputStream) {
+    public boolean writeTrack(List<Track> tracks, @NonNull OutputStream outputStream) {
-        return writeTrack(new Track[]{track}, outputStream);
-    }
-
-    public boolean writeTrack(Track[] tracks, @NonNull OutputStream outputStream) {
         try {
             prepare(outputStream);
             writeHeader(tracks);
             for (Track track : tracks) {
                 writeMarkers(track);
             }
-            boolean hasMultipleTracks = tracks.length > 1;
+            boolean hasMultipleTracks = tracks.size() > 1;
             if (hasMultipleTracks) {
                 writeMultiTrackBegin();
             }
@@ -169,30 +165,28 @@ public class KMLTrackExporter implements TrackExporter {
                 }
 
                 switch (trackPoint.getType()) {
-                    case SEGMENT_START_MANUAL:
+                    case SEGMENT_START_MANUAL, SEGMENT_START_AUTOMATIC -> {
-                    case SEGMENT_START_AUTOMATIC:
                         if (wroteSegment) writeCloseSegment();
                         writeOpenSegment();
                         writeTrackPoint(track.getZoneOffset(), trackPoint);
                         wroteSegment = true;
-                        break;
+                    }
-                    case SEGMENT_END_MANUAL:
+                    case SEGMENT_END_MANUAL -> {
                         if (!wroteSegment) writeOpenSegment();
                         writeTrackPoint(track.getZoneOffset(), trackPoint);
                         writeCloseSegment();
                         wroteSegment = false;
-                        break;
+                    }
-                    case SENSORPOINT:
+                    case SENSORPOINT, TRACKPOINT -> {
-                    case TRACKPOINT:
                         if (!wroteSegment) {
                             // Might happen for older data (pre v3.15.0)
                             writeOpenSegment();
                             wroteSegment = true;
                         }
                         writeTrackPoint(track.getZoneOffset(), trackPoint);
-                        break;
+                    }
-                    default:
+                    default ->
-                        throw new RuntimeException("Exporting this TrackPoint type is not implemented: " + trackPoint.getType());
+                            throw new RuntimeException("Exporting this TrackPoint type is not implemented: " + trackPoint.getType());
                 }
             }
 
@@ -224,22 +218,26 @@ public class KMLTrackExporter implements TrackExporter {
         }
     }
 
-    private void writeHeader(Track[] tracks) {
+    private void writeHeader(List<Track> tracks) {
         if (printWriter != null) {
-            printWriter.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
+            printWriter.println(
-            printWriter.println("<kml xmlns=\"http://www.opengis.net/kml/2.3\"");
+                    """
-            printWriter.println("xmlns:atom=\"http://www.w3.org/2005/Atom\"");
+                            <?xml version="1.0" encoding="UTF-8"?>
-            printWriter.println("xmlns:opentracks=\"http://opentracksapp.com/xmlschemas/v1\">");
+                            """);
-            //TODO ADD xsi:schemaLocation for atom
+            printWriter.println(
-            printWriter.println("xsi:schemaLocation=" +
+                    """
-                    "\"http://www.opengis.net/kml/2.3 http://schemas.opengis.net/kml/2.3/ogckml23.xsd"
+                            <kml xmlns="http://www.opengis.net/kml/2.3"
-                    + " http://opentracksapp.com/xmlschemas/v1 http://opentracksapp.com/xmlschemas/OpenTracks_v1.xsd\">");
+                                xmlns:atom="http://www.w3.org/2005/Atom"
-
+                                xmlns:opentracks="http://opentracksapp.com/xmlschemas/v1"
+                                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                                xsi:schemaLocation="http://www.opengis.net/kml/2.3 http://schemas.opengis.net/kml/2.3/ogckml23.xsd
+                                                    http://opentracksapp.com/xmlschemas/v1 http://opentracksapp.com/xmlschemas/OpenTracks_v1.xsd">
+                            """); //TODO ADD xsi:schemaLocation for atom
             printWriter.println("<Document>");
             printWriter.println("<open>1</open>");
             printWriter.println("<visibility>1</visibility>");
 
-            Track track = tracks[0];
+            Track track = tracks.get(0);
             printWriter.println("<name>" + StringUtils.formatCData(track.getName()) + "</name>");
             printWriter.println("<atom:generator>" + StringUtils.formatCData(context.getString(R.string.app_name)) + "</atom:generator>");
 
@@ -291,7 +289,7 @@ public class KMLTrackExporter implements TrackExporter {
 
     private void writeMultiTrackBegin() {
         if (printWriter != null) {
-            printWriter.println("<Folder id=tour>");
+            printWriter.println("<Folder id=\"tracks\">");
             printWriter.println("<name>" + context.getString(R.string.generic_tracks) + "</name>");
             printWriter.println("<open>1</open>");
         }

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

@@ -28,6 +28,7 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.util.List;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;
 
@@ -64,12 +65,7 @@ public class KmzTrackExporter implements TrackExporter {
     }
 
     @Override
-    public boolean writeTrack(Track track, @NonNull OutputStream outputStream) {
+    public boolean writeTrack(List<Track> tracks, @NonNull OutputStream outputStream) {
-        return writeTrack(new Track[]{track}, outputStream);
-    }
-
-    @Override
-    public boolean writeTrack(Track[] tracks, @NonNull OutputStream outputStream) {
         try (ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream)) {
             // Add kml file
             ZipEntry zipEntry = new ZipEntry(KMZ_KML_FILE);
@@ -91,7 +87,7 @@ public class KmzTrackExporter implements TrackExporter {
         }
     }
 
-    private void addImages(Context context, Track[] tracks, ZipOutputStream zipOutputStream) throws InterruptedException, IOException {
+    private void addImages(Context context, List<Track> tracks, ZipOutputStream zipOutputStream) throws InterruptedException, IOException {
         for (Track track : tracks) {
             try (Cursor cursor = contentProviderUtils.getMarkerCursor(track.getId(), null, -1)) {
                 if (cursor != null && cursor.moveToFirst()) {

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

@@ -19,6 +19,7 @@ package de.dennisguse.opentracks.io.file.exporter;
 import androidx.annotation.NonNull;
 
 import java.io.OutputStream;
+import java.util.List;
 
 import de.dennisguse.opentracks.data.models.Track;
 
@@ -29,7 +30,5 @@ import de.dennisguse.opentracks.data.models.Track;
  */
 public interface TrackExporter {
 
-    boolean writeTrack(Track[] tracks, @NonNull OutputStream outputStream);
+    boolean writeTrack(List<Track> tracks, @NonNull OutputStream outputStream);
-
-    boolean writeTrack(Track track, @NonNull OutputStream outputStream);
 }

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

@@ -101,6 +101,30 @@ public abstract class DirectoryChooserActivity extends AppCompatActivity {
         }
     }
 
+    public static class ExportDirectoryChooserOneFileActivity extends DirectoryChooserActivity {
+
+        @Override
+        protected DocumentFile configureDirectoryChooserIntent(Intent intent) {
+            super.configureDirectoryChooserIntent(intent);
+            intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
+            return IntentUtils.toDocumentFile(this, PreferencesUtils.getDefaultExportDirectoryUri());
+        }
+
+        @Override
+        protected boolean isDirectoryValid(final DocumentFile directoryUri) {
+            return super.isDirectoryValid(directoryUri) && directoryUri.canWrite();
+        }
+
+        @Override
+        protected Intent createNextActivityIntent(Uri directoryUri) {
+            Intent intent = IntentUtils.newIntent(this, ExportActivity.class);
+            intent.putExtra(ExportActivity.EXTRA_DIRECTORY_URI_KEY, directoryUri);
+            intent.putExtra(ExportActivity.EXTRA_ONE_FILE_KEY, true);
+            intent.putExtra(ExportActivity.EXTRA_TRACKFILEFORMAT_KEY, PreferencesUtils.getExportTrackFileFormat());
+            return intent;
+        }
+    }
+
     public static class DefaultTrackExportDirectoryChooserActivity extends DirectoryChooserActivity {
 
         @Override

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

@@ -156,103 +156,94 @@ public class GpxTrackImporter extends DefaultHandler implements XMLImporter.Trac
     @Override
     public void endElement(String uri, String localName, String tag) {
         switch (tag) {
-            case TAG_GPX:
+            case TAG_GPX -> onFileEnd();
-                onFileEnd();
+            case TAG_MARKER -> onMarkerEnd();
-                break;
+            case TAG_TRACK -> {
-            case TAG_MARKER:
-                onMarkerEnd();
-                break;
-            case TAG_TRACK:
                 trackImporter.setTrack(context, name, uuid, description, category, null, zoneOffset);
                 zoneOffset = null;
-                break;
+            }
-            case TAG_TRACK_SEGMENT:
+            case TAG_TRACK_SEGMENT -> onTrackSegmentEnd();
-                onTrackSegmentEnd();
+            case TAG_TRACK_POINT -> currentSegment.add(createTrackPoint());
-                break;
+            case TAG_NAME -> {
-            case TAG_TRACK_POINT:
-                currentSegment.add(createTrackPoint());
-                break;
-            case TAG_NAME:
                 if (content != null) {
                     name = content.trim();
                 }
-                break;
+            }
-            case TAG_DESCRIPTION:
+            case TAG_DESCRIPTION -> {
                 if (content != null) {
                     description = content.trim();
                 }
-                break;
+            }
-            case TAG_TYPE:
+            case TAG_TYPE -> {
                 if (content != null) {
                     category = content.trim();
                 }
-                break;
+            }
-            case TAG_TIME:
+            case TAG_TIME -> {
                 if (content != null) {
                     time = content.trim();
                 }
-                break;
+            }
-            case TAG_ALTITUDE:
+            case TAG_ALTITUDE -> {
                 if (content != null) {
                     altitude = content.trim();
                 }
-                break;
+            }
-            case TAG_COMMENT:
+            case TAG_COMMENT -> {
                 if (content != null) {
                     markerType = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_SPEED:
+            case TAG_EXTENSION_SPEED, TAG_EXTENSION_SPEED_COMPAT -> {
-            case TAG_EXTENSION_SPEED_COMPAT:
                 if (content != null) {
                     speed = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_HEARTRATE:
+            case TAG_EXTENSION_HEARTRATE -> {
                 if (content != null) {
                     heartrate = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_CADENCE:
+            case TAG_EXTENSION_CADENCE -> {
                 if (content != null) {
                     cadence = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_POWER:
+            case TAG_EXTENSION_POWER -> {
                 if (content != null) {
                     power = content.trim();
                 }
-                break;
+            }
-            case TAG_ID:
+            case TAG_ID -> {
                 if (content != null) {
                     uuid = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_GAIN:
+            case TAG_EXTENSION_GAIN -> {
                 if (content != null) {
                     gain = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_LOSS:
+            case TAG_EXTENSION_LOSS -> {
                 if (content != null) {
                     loss = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_DISTANCE:
+            case TAG_EXTENSION_DISTANCE -> {
                 if (content != null) {
                     sensorDistance = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_ACCURACY_HORIZONTAL:
+            case TAG_EXTENSION_ACCURACY_HORIZONTAL -> {
                 if (content != null) {
                     accuracyHorizontal = content.trim();
                 }
-                break;
+            }
-            case TAG_EXTENSION_ACCURACY_VERTICAL:
+            case TAG_EXTENSION_ACCURACY_VERTICAL -> {
                 if (content != null) {
                     accuracyVertical = content.trim();
                 }
-                break;
+            }
         }
 
         content = "";

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

@@ -79,19 +79,17 @@ public class ImportViewModel extends AndroidViewModel implements ImportServiceRe
         String message = resultData.getString(ImportServiceResultReceiver.RESULT_EXTRA_MESSAGE);
 
         switch (resultCode) {
-            case ImportServiceResultReceiver.RESULT_CODE_ERROR:
+            case ImportServiceResultReceiver.RESULT_CODE_ERROR -> {
                 summary.errorCount++;
                 summary.fileErrors.add(getApplication().getString(R.string.import_error_info, fileName, message));
-                break;
+            }
-            case ImportServiceResultReceiver.RESULT_CODE_IMPORTED:
+            case ImportServiceResultReceiver.RESULT_CODE_IMPORTED -> {
                 summary.importedTrackIds.addAll(trackIds);
                 summary.successCount++;
-                break;
+            }
-            case ImportServiceResultReceiver.RESULT_CODE_ALREADY_EXISTS:
+            case ImportServiceResultReceiver.RESULT_CODE_ALREADY_EXISTS -> summary.existsCount++;
-                summary.existsCount++;
+            default ->
-                break;
+                    throw new RuntimeException(TAG + ": import service result code invalid: " + resultCode);
-            default:
-                throw new RuntimeException(TAG + ": import service result code invalid: " + resultCode);
         }
 
         importData.postValue(summary);

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

@@ -136,27 +136,18 @@ public class KmlTrackImporter extends DefaultHandler implements XMLImporter.Trac
     @Override
     public void startElement(String uri, String localName, String tag, Attributes attributes) throws SAXException {
         switch (tag) {
-            case TAG_PLACEMARK:
+            case TAG_PLACEMARK, TAG_PHOTO_OVERLAY ->
-            case TAG_PHOTO_OVERLAY:
                 // Note that a track is contained in a Placemark, calling onMarkerStart will clear various track variables like name, category, and description.
-                onMarkerStart();
+                    onMarkerStart();
-                break;
+            case TAG_MULTI_TRACK, TAG_KML22_MULTI_TRACK -> trackImporter.newTrack();
-            case TAG_MULTI_TRACK:
+            case TAG_TRACK, TAG_KML22_TRACK -> {
-            case TAG_KML22_MULTI_TRACK:
-                trackImporter.newTrack();
-                break;
-            case TAG_TRACK:
-            case TAG_KML22_TRACK:
                 if (trackImporter == null) {
                     throw new SAXException("Missing " + TAG_MULTI_TRACK);
                 }
                 onTrackSegmentStart();
-                break;
+            }
-            case TAG_DATA_CATEGORY:
+            case TAG_DATA_CATEGORY, TAG_SIMPLE_ARRAY_DATA, TAG_KML22_SIMPLE_ARRAY_DATA ->
-            case TAG_SIMPLE_ARRAY_DATA:
+                    dataType = attributes.getValue(ATTRIBUTE_NAME);
-            case TAG_KML22_SIMPLE_ARRAY_DATA:
-                dataType = attributes.getValue(ATTRIBUTE_NAME);
-                break;
         }
     }
 
@@ -168,32 +159,18 @@ public class KmlTrackImporter extends DefaultHandler implements XMLImporter.Trac
     @Override
     public void endElement(String uri, String localName, String tag) throws SAXException {
         switch (tag) {
-            case TAG_KML:
+            case TAG_KML -> onFileEnd();
-                onFileEnd();
+            case TAG_PLACEMARK, TAG_PHOTO_OVERLAY ->
-                break;
-            case TAG_PLACEMARK:
-            case TAG_PHOTO_OVERLAY:
                 // Note that a track is contained in a Placemark, calling onMarkerEnd is save since markerType is not set for a track.
-                onMarkerEnd();
+                    onMarkerEnd();
-                break;
+            case TAG_COORDINATES -> onMarkerLocationEnd();
-            case TAG_COORDINATES:
+            case TAG_MULTI_TRACK, TAG_KML22_MULTI_TRACK -> {
-                onMarkerLocationEnd();
-                break;
-            case TAG_MULTI_TRACK:
-            case TAG_KML22_MULTI_TRACK:
                 trackImporter.setTrack(context, name, uuid, description, category, icon, zoneOffset);
                 zoneOffset = null;
-                break;
+            }
-            case TAG_TRACK:
+            case TAG_TRACK, TAG_KML22_TRACK -> onTrackSegmentEnd();
-            case TAG_KML22_TRACK:
+            case TAG_COORD, TAG_KML22_COORD -> onCoordEnded();
-                onTrackSegmentEnd();
+            case TAG_VALUE, TAG_KML22_VALUE -> {
-                break;
-            case TAG_COORD:
-            case TAG_KML22_COORD:
-                onCoordEnded();
-                break;
-            case TAG_VALUE:
-            case TAG_KML22_VALUE:
                 if (KMLTrackExporter.EXTENDED_DATA_TYPE_CATEGORY.equals(dataType)) {
                     if (content != null) {
                         category = content.trim();
@@ -201,28 +178,28 @@ public class KmlTrackImporter extends DefaultHandler implements XMLImporter.Trac
                 } else {
                     onExtendedDataValueEnd();
                 }
-                break;
+            }
-            case TAG_NAME:
+            case TAG_NAME -> {
                 if (content != null) {
                     name = content.trim();
                 }
-                break;
+            }
-            case TAG_UUID:
+            case TAG_UUID -> {
                 if (content != null) {
                     uuid = content.trim();
                 }
-                break;
+            }
-            case TAG_DESCRIPTION:
+            case TAG_DESCRIPTION -> {
                 if (content != null) {
                     description = content.trim();
                 }
-                break;
+            }
-            case TAG_ICON:
+            case TAG_ICON -> {
                 if (content != null) {
                     icon = content.trim();
                 }
-                break;
+            }
-            case TAG_WHEN:
+            case TAG_WHEN -> {
                 if (content != null) {
                     try {
                         OffsetDateTime time = StringUtils.parseTime(content.trim());
@@ -234,18 +211,17 @@ public class KmlTrackImporter extends DefaultHandler implements XMLImporter.Trac
                         throw new ParsingException(createErrorMessage(String.format(Locale.US, "Unable to parse time: %s", content.trim())), e);
                     }
                 }
-
+            }
-                break;
+            case TAG_STYLE_URL -> {
-            case TAG_STYLE_URL:
                 if (content != null) {
                     markerType = content.trim();
                 }
-                break;
+            }
-            case TAG_HREF:
+            case TAG_HREF -> {
                 if (content != null) {
                     photoUrl = content.trim();
                 }
-                break;
+            }
         }
 
         // Reset element content
@@ -436,35 +412,19 @@ public class KmlTrackImporter extends DefaultHandler implements XMLImporter.Trac
             }
         }
         switch (dataType) {
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_SPEED:
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_SPEED -> sensorSpeedList.add(value);
-                sensorSpeedList.add(value);
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_DISTANCE -> sensorDistanceList.add(value);
-                break;
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_POWER -> sensorPowerList.add(value);
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_DISTANCE:
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_HEART_RATE -> sensorHeartRateList.add(value);
-                sensorDistanceList.add(value);
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_CADENCE -> sensorCadenceList.add(value);
-                break;
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_ALTITUDE_GAIN -> altitudeGainList.add(value);
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_POWER:
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_ALTITUDE_LOSS -> altitudeLossList.add(value);
-                sensorPowerList.add(value);
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_ACCURACY_HORIZONTAL ->
-                break;
+                    accuracyHorizontal.add(value);
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_HEART_RATE:
+            case KMLTrackExporter.EXTENDED_DATA_TYPE_ACCURACY_VERTICAL ->
-                sensorHeartRateList.add(value);
+                    accuracyVertical.add(value);
-                break;
+            default ->
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_CADENCE:
+                    Log.w(TAG, "Data from extended data " + dataType + " is not (yet) supported.");
-                sensorCadenceList.add(value);
-                break;
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_ALTITUDE_GAIN:
-                altitudeGainList.add(value);
-                break;
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_ALTITUDE_LOSS:
-                altitudeLossList.add(value);
-                break;
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_ACCURACY_HORIZONTAL:
-                accuracyHorizontal.add(value);
-                break;
-            case KMLTrackExporter.EXTENDED_DATA_TYPE_ACCURACY_VERTICAL:
-                accuracyVertical.add(value);
-                break;
-            default:
-                Log.w(TAG, "Data from extended data " + dataType + " is not (yet) supported.");
         }
     }
 

src/main/java/de/dennisguse/opentracks/sensors/AbstractBluetoothConnectionManager.java

@@ -40,9 +40,9 @@ import de.dennisguse.opentracks.sensors.sensorData.SensorData;
  * Manages connection to a Bluetooth LE sensor and subscribes for onChange-notifications.
  * Also parses the transferred data into {@link SensorDataObserver}.
  */
-public abstract class BluetoothConnectionManager<DataType> {
+public abstract class AbstractBluetoothConnectionManager<DataType> {
 
-    private static final String TAG = BluetoothConnectionManager.class.getSimpleName();
+    private static final String TAG = AbstractBluetoothConnectionManager.class.getSimpleName();
 
     private final SensorDataObserver observer;
 
@@ -53,23 +53,22 @@ public abstract class BluetoothConnectionManager<DataType> {
         @Override
         public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
             switch (newState) {
-                case BluetoothProfile.STATE_CONNECTING:
+                case BluetoothProfile.STATE_CONNECTING ->
-                    Log.d(TAG, "Connecting to sensor: " + gatt.getDevice());
+                        Log.i(TAG, "Connecting to sensor: " + gatt.getDevice());
-                    break;
+                case BluetoothProfile.STATE_CONNECTED -> {
-                case BluetoothProfile.STATE_CONNECTED:
+                    Log.i(TAG, "Connected to sensor: " + gatt.getDevice() + "; discovering services.");
-                    Log.d(TAG, "Connected to sensor: " + gatt.getDevice());
-
                     gatt.discoverServices();
-                    break;
+                }
-                case BluetoothProfile.STATE_DISCONNECTING:
+                case BluetoothProfile.STATE_DISCONNECTING ->
-                    Log.d(TAG, "Disconnecting from sensor: " + gatt.getDevice());
+                        Log.i(TAG, "Disconnecting from sensor: " + gatt.getDevice());
-                    break;
+                case BluetoothProfile.STATE_DISCONNECTED -> {
-
+                    //This is also triggered, if no connection was established (ca. 30s)
-                case BluetoothProfile.STATE_DISCONNECTED:
+                    Log.i(TAG, "Disconnected from sensor: " + gatt.getDevice() + "; trying to reconnect");
-                    Log.d(TAG, "Disconnected from sensor: " + gatt.getDevice());
+                    if (gatt.connect()) {
-
+                        Log.e(TAG, "Could not trigger reconnect for sensor: " + gatt.getDevice());
+                    }
                     clearData();
-                    break;
+                }
             }
         }
 
@@ -133,12 +132,12 @@ public abstract class BluetoothConnectionManager<DataType> {
         }
     };
 
-    BluetoothConnectionManager(ServiceMeasurementUUID serviceUUUID, SensorDataObserver observer) {
+    AbstractBluetoothConnectionManager(ServiceMeasurementUUID serviceUUUID, SensorDataObserver observer) {
         this.serviceMeasurementUUIDs = List.of(serviceUUUID);
         this.observer = observer;
     }
 
-    BluetoothConnectionManager(List<ServiceMeasurementUUID> serviceUUUID, SensorDataObserver observer) {
+    AbstractBluetoothConnectionManager(List<ServiceMeasurementUUID> serviceUUUID, SensorDataObserver observer) {
         this.serviceMeasurementUUIDs = serviceUUUID;
         this.observer = observer;
     }

src/main/java/de/dennisguse/opentracks/sensors/AltitudeSumManager.java

@@ -19,7 +19,7 @@ import de.dennisguse.opentracks.data.models.TrackPoint;
 /**
  * Estimates the altitude gain and altitude loss using the device's pressure sensor (i.e., barometer).
  */
-public class AltitudeSumManager implements SensorEventListener {
+public class AltitudeSumManager implements SensorConnector, SensorEventListener {
 
     private static final String TAG = AltitudeSumManager.class.getSimpleName();
 

src/main/java/de/dennisguse/opentracks/sensors/BluetoothConnectionManagerCyclingCadence.java

@@ -8,11 +8,11 @@ import de.dennisguse.opentracks.sensors.sensorData.SensorDataCyclingCadence;
 import de.dennisguse.opentracks.sensors.sensorData.SensorDataCyclingCadenceAndDistanceSpeed;
 import de.dennisguse.opentracks.sensors.sensorData.SensorDataCyclingPower;
 
-public class BluetoothRemoteSensorManagerCyclingCadence extends BluetoothConnectionManager<Cadence> {
+public class BluetoothConnectionManagerCyclingCadence extends AbstractBluetoothConnectionManager<Cadence> {
 
-    private static final String TAG = BluetoothRemoteSensorManagerCyclingCadence.class.getSimpleName();
+    private static final String TAG = BluetoothConnectionManagerCyclingCadence.class.getSimpleName();
 
-    BluetoothRemoteSensorManagerCyclingCadence(SensorDataObserver observer) {
+    BluetoothConnectionManagerCyclingCadence(SensorDataObserver observer) {
         super(BluetoothUtils.CYCLING_CADENCE, observer);
     }
 

src/main/java/de/dennisguse/opentracks/sensors/BluetoothConnectionManagerCyclingDistanceSpeed.java

@@ -5,9 +5,9 @@ import android.bluetooth.BluetoothGattCharacteristic;
 import de.dennisguse.opentracks.sensors.sensorData.SensorDataCyclingCadenceAndDistanceSpeed;
 import de.dennisguse.opentracks.sensors.sensorData.SensorDataCyclingDistanceSpeed;
 
-public class BluetoothRemoteSensorManagerCyclingDistanceSpeed extends BluetoothConnectionManager<SensorDataCyclingDistanceSpeed.Data> {
+public class BluetoothConnectionManagerCyclingDistanceSpeed extends AbstractBluetoothConnectionManager<SensorDataCyclingDistanceSpeed.Data> {
 
-    BluetoothRemoteSensorManagerCyclingDistanceSpeed(SensorDataObserver observer) {
+    BluetoothConnectionManagerCyclingDistanceSpeed(SensorDataObserver observer) {
         super(BluetoothUtils.CYCLING_SPEED_CADENCE, observer);
     }
 

src/main/java/de/dennisguse/opentracks/sensors/BluetoothConnectionManagerCyclingPower.java

@@ -7,9 +7,9 @@ import androidx.annotation.NonNull;
 import de.dennisguse.opentracks.data.models.Power;
 import de.dennisguse.opentracks.sensors.sensorData.SensorDataCyclingPower;
 
-public class BluetoothRemoteSensorManagerCyclingPower extends BluetoothConnectionManager<Power> {
+public class BluetoothConnectionManagerCyclingPower extends AbstractBluetoothConnectionManager<Power> {
 
-    BluetoothRemoteSensorManagerCyclingPower(@NonNull SensorDataObserver observer) {
+    BluetoothConnectionManagerCyclingPower(@NonNull SensorDataObserver observer) {
         super(BluetoothUtils.CYCLING_POWER, observer);
     }
 

src/main/java/de/dennisguse/opentracks/sensors/BluetoothConnectionManagerHeartRate.java

@@ -7,9 +7,9 @@ import androidx.annotation.NonNull;
 import de.dennisguse.opentracks.data.models.HeartRate;
 import de.dennisguse.opentracks.sensors.sensorData.SensorDataHeartRate;
 
-public class BluetoothRemoteSensorManagerHeartRate extends BluetoothConnectionManager<HeartRate> {
+public class BluetoothConnectionManagerHeartRate extends AbstractBluetoothConnectionManager<HeartRate> {
 
-    BluetoothRemoteSensorManagerHeartRate(@NonNull SensorDataObserver observer) {
+    BluetoothConnectionManagerHeartRate(@NonNull SensorDataObserver observer) {
         super(BluetoothUtils.HEARTRATE, observer);
     }
 

src/main/java/de/dennisguse/opentracks/sensors/BluetoothConnectionRunningSpeedAndCadence.java

@@ -6,9 +6,9 @@ import androidx.annotation.NonNull;
 
 import de.dennisguse.opentracks.sensors.sensorData.SensorDataRunning;
 
-public class BluetoothRemoteSensorManagerRunningSpeedAndCadence extends BluetoothConnectionManager<SensorDataRunning.Data> {
+public class BluetoothConnectionRunningSpeedAndCadence extends AbstractBluetoothConnectionManager<SensorDataRunning.Data> {
 
-    BluetoothRemoteSensorManagerRunningSpeedAndCadence(@NonNull SensorDataObserver observer) {
+    BluetoothConnectionRunningSpeedAndCadence(@NonNull SensorDataObserver observer) {
         super(BluetoothUtils.RUNNING_SPEED_CADENCE, observer);
     }
 

src/main/java/de/dennisguse/opentracks/sensors/BluetoothRemoteSensorManager.java

@@ -52,7 +52,7 @@ import de.dennisguse.opentracks.util.PermissionRequester;
  *
  * @author Sandor Dornbush
  */
-public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.SensorDataObserver {
+public class BluetoothRemoteSensorManager implements SensorConnector, AbstractBluetoothConnectionManager.SensorDataObserver {
 
     private static final String TAG = BluetoothRemoteSensorManager.class.getSimpleName();
 
@@ -65,15 +65,15 @@ public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.
 
     private Distance preferenceWheelCircumference;
 
-    private final BluetoothRemoteSensorManagerHeartRate heartRate = new BluetoothRemoteSensorManagerHeartRate(this);
+    private final BluetoothConnectionManagerHeartRate heartRate = new BluetoothConnectionManagerHeartRate(this);
-    private final BluetoothRemoteSensorManagerCyclingCadence cyclingCadence = new BluetoothRemoteSensorManagerCyclingCadence(this);
+    private final BluetoothConnectionManagerCyclingCadence cyclingCadence = new BluetoothConnectionManagerCyclingCadence(this);
-    private final BluetoothRemoteSensorManagerCyclingDistanceSpeed cyclingSpeed = new BluetoothRemoteSensorManagerCyclingDistanceSpeed(this);
+    private final BluetoothConnectionManagerCyclingDistanceSpeed cyclingSpeed = new BluetoothConnectionManagerCyclingDistanceSpeed(this);
-    private final BluetoothRemoteSensorManagerCyclingPower cyclingPower = new BluetoothRemoteSensorManagerCyclingPower(this);
+    private final BluetoothConnectionManagerCyclingPower cyclingPower = new BluetoothConnectionManagerCyclingPower(this);
-    private final BluetoothRemoteSensorManagerRunningSpeedAndCadence runningSpeedAndCadence = new BluetoothRemoteSensorManagerRunningSpeedAndCadence(this);
+    private final BluetoothConnectionRunningSpeedAndCadence runningSpeedAndCadence = new BluetoothConnectionRunningSpeedAndCadence(this);
 
     private final SensorDataSet sensorDataSet = new SensorDataSet();
 
-    private final SensorDataSetChangeObserver observer;
+    private final SensorManager.SensorDataSetChangeObserver observer;
 
     private final SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() {
         @Override
@@ -114,21 +114,23 @@ public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.
         }
     };
 
-    public BluetoothRemoteSensorManager(@NonNull Context context, @NonNull Handler handler, @NonNull SensorDataSetChangeObserver observer) {
+    public BluetoothRemoteSensorManager(@NonNull Context context, @NonNull Handler handler, @NonNull SensorManager.SensorDataSetChangeObserver observer) {
         this.context = context;
         this.handler = handler;
         this.observer = observer;
         bluetoothAdapter = BluetoothUtils.getAdapter(context);
     }
 
-    public void start() {
+    @Override
+    public void start(Context context, Handler handler) {
         started = true;
 
         //Registering triggers connection startup
         PreferencesUtils.registerOnSharedPreferenceChangeListener(sharedPreferenceChangeListener);
     }
 
-    public synchronized void stop() {
+    @Override
+    public synchronized void stop(Context context) {
         heartRate.disconnect();
         cyclingCadence.disconnect();
         cyclingSpeed.disconnect();
@@ -145,7 +147,7 @@ public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.
         return bluetoothAdapter != null && bluetoothAdapter.isEnabled();
     }
 
-    private synchronized void connect(BluetoothConnectionManager<?> connectionManager, String address) {
+    private synchronized void connect(AbstractBluetoothConnectionManager<?> connectionManager, String address) {
         if (!isEnabled()) {
             Log.w(TAG, "Bluetooth not enabled.");
             return;
@@ -230,8 +232,4 @@ public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.
     public Handler getHandler() {
         return handler;
     }
-
-    public interface SensorDataSetChangeObserver {
-        void onChange(SensorDataSet sensorDataSet);
-    }
 }

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

@@ -28,6 +28,7 @@ import java.util.Collections;
 import java.util.List;
 import java.util.UUID;
 
+import de.dennisguse.opentracks.data.models.BatteryLevel;
 import de.dennisguse.opentracks.data.models.Cadence;
 import de.dennisguse.opentracks.data.models.Distance;
 import de.dennisguse.opentracks.data.models.HeartRate;
@@ -48,6 +49,11 @@ public class BluetoothUtils {
 
     public static final UUID CLIENT_CHARACTERISTIC_CONFIG_UUID = new UUID(0x290200001000L, 0x800000805f9b34fbL);
 
+    public static final ServiceMeasurementUUID BATTERY = new ServiceMeasurementUUID(
+            new UUID(0x180F00001000L, 0x800000805f9b34fbL),
+            new UUID(0x2A1900001000L, 0x800000805f9b34fbL)
+    );
+
     public static final ServiceMeasurementUUID HEARTRATE = new ServiceMeasurementUUID(
             new UUID(0x180D00001000L, 0x800000805f9b34fbL),
             new UUID(0x2A3700001000L, 0x800000805f9b34fbL)
@@ -102,6 +108,17 @@ public class BluetoothUtils {
         return BluetoothUtils.getAdapter(context) != null;
     }
 
+    public static BatteryLevel parseBatteryLevel(BluetoothGattCharacteristic characteristic) {
+        // DOCUMENTATION org.bluetooth.characteristic.battery_level.xml
+        byte[] raw = characteristic.getValue();
+        if (raw.length == 0) {
+            return null;
+        }
+
+        final int batteryLevel = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 0);
+        return BatteryLevel.of(batteryLevel);
+    }
+
     public static HeartRate parseHeartRate(BluetoothGattCharacteristic characteristic) {
         //DOCUMENTATION https://www.bluetooth.com/wp-content/uploads/Sitecore-Media-Library/Gatt/Xml/Characteristics/org.bluetooth.characteristic.heart_rate_measurement.xml
         byte[] raw = characteristic.getValue();

src/main/java/de/dennisguse/opentracks/sensors/SensorConnector.java

@@ -0,0 +1,11 @@
+package de.dennisguse.opentracks.sensors;
+
+import android.content.Context;
+import android.os.Handler;
+
+public interface SensorConnector {
+
+    void start(Context context, Handler handler);
+
+    void stop(Context context);
+}

src/main/java/de/dennisguse/opentracks/sensors/SensorManager.java

@@ -0,0 +1,85 @@
+package de.dennisguse.opentracks.sensors;
+
+import android.content.Context;
+import android.os.Handler;
+import android.util.Log;
+
+import androidx.annotation.VisibleForTesting;
+
+import de.dennisguse.opentracks.data.models.TrackPoint;
+import de.dennisguse.opentracks.sensors.sensorData.SensorData;
+import de.dennisguse.opentracks.sensors.sensorData.SensorDataSet;
+
+public class SensorManager {
+
+    private static final String TAG = SensorManager.class.getSimpleName();
+
+    private BluetoothRemoteSensorManager bluetoothSensorManager;
+
+    private AltitudeSumManager altitudeSumManager;
+
+    public SensorManager(Context context, Handler handler, SensorDataSetChangeObserver observer) {
+        bluetoothSensorManager = new BluetoothRemoteSensorManager(context, handler, observer);
+        altitudeSumManager = new AltitudeSumManager();
+    }
+
+    public void start(Context context, Handler handler) {
+        bluetoothSensorManager.start(context, handler);
+        altitudeSumManager.start(context, handler);
+    }
+
+    public void stop(Context context) {
+        if (bluetoothSensorManager != null) {
+            bluetoothSensorManager.stop(context);
+            bluetoothSensorManager = null;
+        }
+
+        if (altitudeSumManager != null) {
+            altitudeSumManager.stop(context);
+            altitudeSumManager = null;
+        }
+    }
+
+    public SensorDataSet fill(TrackPoint trackPoint) {
+        altitudeSumManager.fill(trackPoint);
+        return bluetoothSensorManager.fill(trackPoint);
+    }
+
+    public void reset() {
+        if (bluetoothSensorManager == null || altitudeSumManager == null) {
+            Log.d(TAG, "No recording running and no reset necessary.");
+            return;
+        }
+        bluetoothSensorManager.reset();
+        altitudeSumManager.reset();
+    }
+
+    @Deprecated
+    @VisibleForTesting
+    public BluetoothRemoteSensorManager getBluetoothSensorManager() {
+        return bluetoothSensorManager;
+    }
+
+    @Deprecated
+    @VisibleForTesting
+    public void setBluetoothSensorManager(BluetoothRemoteSensorManager remoteSensorManager) {
+        this.bluetoothSensorManager = remoteSensorManager;
+    }
+
+    @Deprecated
+    @VisibleForTesting
+    public AltitudeSumManager getAltitudeSumManager() {
+        return altitudeSumManager;
+    }
+
+    @Deprecated
+    @VisibleForTesting
+    public void setAltitudeSumManager(AltitudeSumManager altitudeSumManager) {
+        this.altitudeSumManager = altitudeSumManager;
+    }
+
+    @Deprecated
+    public interface SensorDataSetChangeObserver {
+        void onChange(SensorDataSet sensorDataSet);
+    }
+}

src/main/java/de/dennisguse/opentracks/sensors/UintUtils.java

@@ -14,6 +14,7 @@ public class UintUtils {
      * @return diff
      */
     public static long diff(long a, long b, final long UINT_MAX) {
+
         if (a < 0 || b < 0) {
             throw new RuntimeException("a or b cannot be less than zero.");
         }
@@ -25,6 +26,6 @@ public class UintUtils {
             return a - b;
         }
 
-        return (UINT_MAX - b) + a;
+        return (UINT_MAX + 1 - b) + a;
     }
 }

src/main/java/de/dennisguse/opentracks/sensors/sensorData/SensorData.java

@@ -1,7 +1,6 @@
 package de.dennisguse.opentracks.sensors.sensorData;
 
 import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 
 import java.time.Instant;
@@ -32,16 +31,6 @@ public abstract class SensorData<T> {
         this.time = time;
     }
 
-    @NonNull
-    public String getSensorAddress() {
-        return sensorAddress;
-    }
-
-    @Nullable
-    public String getSensorName() {
-        return sensorName;
-    }
-
     public String getSensorNameOrAddress() {
         return sensorName != null ? sensorName : sensorAddress;
     }

src/main/java/de/dennisguse/opentracks/sensors/sensorData/SensorDataCyclingCadence.java

@@ -76,9 +76,8 @@ public class SensorDataCyclingCadence extends SensorData<Cadence> {
 
     @Override
     public boolean equals(@Nullable Object obj) {
-        if (!(obj instanceof SensorDataCyclingCadence)) return false;
+        if (!(obj instanceof SensorDataCyclingCadence comp)) return false;
 
-        SensorDataCyclingCadence comp = (SensorDataCyclingCadence) obj;
         if (hasData() && comp.hasData() == hasData()) {
             return getCrankRevolutionsCount() == comp.getCrankRevolutionsCount() && getCrankRevolutionsTime() == comp.getCrankRevolutionsTime();
         } else {

src/main/java/de/dennisguse/opentracks/sensors/sensorData/SensorDataCyclingDistanceSpeed.java

@@ -93,9 +93,8 @@ public class SensorDataCyclingDistanceSpeed extends SensorData<SensorDataCycling
 
     @Override
     public boolean equals(@Nullable Object obj) {
-        if (!(obj instanceof SensorDataCyclingDistanceSpeed)) return false;
+        if (!(obj instanceof SensorDataCyclingDistanceSpeed comp)) return false;
 
-        SensorDataCyclingDistanceSpeed comp = (SensorDataCyclingDistanceSpeed) obj;
         if (!(hasData() && comp.hasData())) {
             return false;
         }

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

@@ -111,7 +111,7 @@ public class TrackRecordingService extends Service implements TrackPointCreator.
         egm2008CorrectionManager = new EGM2008CorrectionManager();
         trackRecordingManager = new TrackRecordingManager(this);
         trackRecordingManager.start();
-        trackPointCreator = new TrackPointCreator(this);
+        trackPointCreator = new TrackPointCreator(this, this, handler);
 
         voiceAnnouncementManager = new VoiceAnnouncementManager(this);
         notificationManager = new TrackRecordingServiceNotificationManager(this);
@@ -177,7 +177,6 @@ public class TrackRecordingService extends Service implements TrackPointCreator.
     }
 
     public void resumeTrack(Track.Id trackId) {
-        trackPointCreator.reset();
         if (!trackRecordingManager.resumeExistingTrack(trackId, trackPointCreator)) {
             Log.w(TAG, "Cannot resume a non-existing track.");
             return;
@@ -328,7 +327,7 @@ public class TrackRecordingService extends Service implements TrackPointCreator.
         TrackPoint trackPoint = data.second.first;
         egm2008CorrectionManager.correctAltitude(this, trackPoint);
 
-        localVoiceAnnouncementManager.update(data.first);
+        localVoiceAnnouncementManager.update(this, data.first);
 
         recordingDataObservable.postValue(new RecordingData(data.first, trackPoint, data.second.second));
     }

src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncement.java

@@ -28,6 +28,7 @@ import android.util.Log;
 import androidx.annotation.NonNull;
 
 import java.util.Arrays;
+import java.util.List;
 import java.util.Locale;
 
 import de.dennisguse.opentracks.R;
@@ -67,17 +68,8 @@ public class VoiceAnnouncement {
         public void onAudioFocusChange(int focusChange) {
             Log.d(TAG, "Audio focus changed to " + focusChange);
 
-            boolean stop = false;
+            boolean stop = List.of(AudioManager.AUDIOFOCUS_LOSS, AudioManager.AUDIOFOCUS_LOSS_TRANSIENT, AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK)
-            switch (focusChange) {
+                    .contains(focusChange);
-                case AudioManager.AUDIOFOCUS_GAIN:
-                    stop = false;
-                    break;
-                case AudioManager.AUDIOFOCUS_LOSS:
-                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
-                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
-                    stop = true;
-                    break;
-            }
 
             if (stop && tts != null && tts.isSpeaking()) {
                 tts.stop();

src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncementManager.java

@@ -15,12 +15,14 @@
  */
 package de.dennisguse.opentracks.services.announcement;
 
+import android.content.Context;
 import android.content.SharedPreferences;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
+import androidx.mediarouter.media.MediaRouter;
 
 import java.time.Duration;
 
@@ -73,12 +75,20 @@ public class VoiceAnnouncementManager implements SharedPreferences.OnSharedPrefe
         updateNextTaskDistance();
     }
 
-    public void update(@NonNull Track track) {
+    public void update(@NonNull Context context, @NonNull Track track) {
         if (voiceAnnouncement == null) {
             Log.e(TAG, "Cannot update when in status shutdown.");
             return;
         }
 
+        if (!PreferencesUtils.shouldVoiceAnnouncementOnDeviceSpeaker()
+                && MediaRouter.getInstance(context)
+                .getSelectedRoute()
+                .isDeviceSpeaker()) {
+            Log.i(TAG, "No voice announcement on device speaker.");
+            return;
+        }
+
         boolean announce = false;
         this.trackStatistics = track.getTrackStatistics();
         if (trackStatistics.getTotalDistance().greaterThan(nextTotalDistance)) {

src/main/java/de/dennisguse/opentracks/services/announcement/VoiceAnnouncementUtils.java

@@ -43,29 +43,28 @@ class VoiceAnnouncementUtils {
         String unitDistanceTTS;
         String unitSpeedTTS;
         switch (unitSystem) {
-            case METRIC:
+            case METRIC -> {
                 perUnitStringId = R.string.voice_per_kilometer;
                 distanceId = R.plurals.voiceDistanceKilometers;
                 speedId = R.plurals.voiceSpeedKilometersPerHour;
                 unitDistanceTTS = "kilometer";
                 unitSpeedTTS = "kilometer per hour";
-                break;
+            }
-            case IMPERIAL:
+            case IMPERIAL -> {
                 perUnitStringId = R.string.voice_per_mile;
                 distanceId = R.plurals.voiceDistanceMiles;
                 speedId = R.plurals.voiceSpeedMilesPerHour;
                 unitDistanceTTS = "mile";
                 unitSpeedTTS = "mile per hour";
-                break;
+            }
-            case NAUTICAL_IMPERIAL:
+            case NAUTICAL_IMPERIAL -> {
                 perUnitStringId = R.string.voice_per_nautical_mile;
                 distanceId = R.plurals.voiceDistanceNauticalMiles;
                 speedId = R.plurals.voiceSpeedMKnots;
                 unitDistanceTTS = "nautical mile";
                 unitSpeedTTS = "knots";
-                break;
+            }
-            default:
+            default -> throw new RuntimeException("Not implemented");
-                throw new RuntimeException("Not implemented");
         }
 
         double distanceInUnit = totalDistance.toKM_Miles(unitSystem);

src/main/java/de/dennisguse/opentracks/services/handlers/EGM2008CorrectionManager.java

@@ -5,7 +5,6 @@ import android.util.Log;
 
 import java.io.IOException;
 
-import de.dennisguse.opentracks.data.models.Altitude;
 import de.dennisguse.opentracks.data.models.TrackPoint;
 import de.dennisguse.opentracks.util.EGM2008Utils;
 
@@ -30,6 +29,6 @@ public class EGM2008CorrectionManager {
             }
         }
 
-        trackPoint.setAltitude(Altitude.EGM2008.of(egm2008Correction.correctAltitude(trackPoint.getLocation())));
+        trackPoint.setAltitude(egm2008Correction.correctAltitude(trackPoint.getLocation()));
     }
 }

src/main/java/de/dennisguse/opentracks/services/handlers/GPSManager.java

@@ -20,14 +20,15 @@ import java.time.Instant;
 import de.dennisguse.opentracks.R;
 import de.dennisguse.opentracks.data.models.Distance;
 import de.dennisguse.opentracks.data.models.TrackPoint;
+import de.dennisguse.opentracks.sensors.SensorConnector;
 import de.dennisguse.opentracks.settings.PreferencesUtils;
 import de.dennisguse.opentracks.util.LocationUtils;
 import de.dennisguse.opentracks.util.PermissionRequester;
 
 @VisibleForTesting(otherwise = VisibleForTesting.PACKAGE_PRIVATE)
-public class GPSHandler implements LocationListenerCompat, GpsStatus.GpsStatusListener, SharedPreferences.OnSharedPreferenceChangeListener {
+public class GPSManager implements SensorConnector, LocationListenerCompat, GpsStatus.GpsStatusListener, SharedPreferences.OnSharedPreferenceChangeListener {
 
-    private final String TAG = GPSHandler.class.getSimpleName();
+    private final String TAG = GPSManager.class.getSimpleName();
 
     public static final String LOCATION_PROVIDER = LocationManager.GPS_PROVIDER;
 
@@ -40,11 +41,11 @@ public class GPSHandler implements LocationListenerCompat, GpsStatus.GpsStatusLi
     private Duration gpsInterval;
     private Distance thresholdHorizontalAccuracy;
 
-    public GPSHandler(TrackPointCreator trackPointCreator) {
+    public GPSManager(TrackPointCreator trackPointCreator) {
         this.trackPointCreator = trackPointCreator;
     }
 
-    public void onStart(@NonNull Context context, @NonNull Handler handler) {
+    public void start(@NonNull Context context, @NonNull Handler handler) {
         this.context = context;
         this.handler = handler;
 
@@ -61,7 +62,7 @@ public class GPSHandler implements LocationListenerCompat, GpsStatus.GpsStatusLi
 
     @SuppressWarnings({"MissingPermission"})
     //TODO upgrade to AGP7.0.0/API31 started complaining about removeUpdates.
-    public void onStop() {
+    public void stop(Context context) {
         if (locationManager != null && context != null) {
             if (PermissionRequester.GPS.hasPermission(context)) {
                 LocationManagerCompat.removeUpdates(locationManager, this);

src/main/java/de/dennisguse/opentracks/services/handlers/TrackPointCreator.java

@@ -16,14 +16,13 @@ import java.time.ZoneId;
 
 import de.dennisguse.opentracks.data.models.Distance;
 import de.dennisguse.opentracks.data.models.TrackPoint;
-import de.dennisguse.opentracks.sensors.AltitudeSumManager;
+import de.dennisguse.opentracks.sensors.SensorManager;
-import de.dennisguse.opentracks.sensors.BluetoothRemoteSensorManager;
 import de.dennisguse.opentracks.sensors.sensorData.SensorDataSet;
 
 /**
  * Creates TrackPoints while recording by fusing data from different sensors (e.g., GNSS, barometer, BLE sensors).
  */
-public class TrackPointCreator implements BluetoothRemoteSensorManager.SensorDataSetChangeObserver {
+public class TrackPointCreator implements SensorManager.SensorDataSetChangeObserver {
 
     private static final String TAG = TrackPointCreator.class.getSimpleName();
 
@@ -34,45 +33,34 @@ public class TrackPointCreator implements BluetoothRemoteSensorManager.SensorDat
     @NonNull
     private Clock clock = new MonotonicClock();
 
-    private final GPSHandler gpsHandler;
+    private final GPSManager gpsManager;
-    private BluetoothRemoteSensorManager remoteSensorManager;
+    private SensorManager sensorManager;
-    private AltitudeSumManager altitudeSumManager;
 
-    public TrackPointCreator(Callback service) {
+    public TrackPointCreator(Callback service, Context context, Handler handler) {
         this.service = service;
-        this.gpsHandler = new GPSHandler(this);
+        this.gpsManager = new GPSManager(this);
+        this.sensorManager = new SensorManager(context, handler, this);
     }
 
     @VisibleForTesting
-    TrackPointCreator(GPSHandler gpsHandler, Callback service) {
+    TrackPointCreator(GPSManager gpsManager, Callback service) {
         this.service = service;
-        this.gpsHandler = gpsHandler;
+        this.gpsManager = gpsManager;
     }
 
     public synchronized void start(@NonNull Context context, @NonNull Handler handler) {
         this.context = context;
 
-        gpsHandler.onStart(context, handler);
+        gpsManager.start(context, handler);
-
+        sensorManager.start(context, handler);
-        remoteSensorManager = new BluetoothRemoteSensorManager(context, handler, this);
-        altitudeSumManager = new AltitudeSumManager();
-
-        remoteSensorManager.start();
-        altitudeSumManager.start(context, handler);
-
     }
 
     private boolean isStarted() {
         return context != null;
     }
 
-    public synchronized void reset() {
+    private synchronized void reset() {
-        if (remoteSensorManager == null || altitudeSumManager == null) {
+        sensorManager.reset();
-            Log.d(TAG, "No recording running and no reset necessary.");
-            return;
-        }
-        remoteSensorManager.reset();
-        altitudeSumManager.reset();
     }
 
     private SensorDataSet addSensorData(TrackPoint trackPoint) {
@@ -80,31 +68,12 @@ public class TrackPointCreator implements BluetoothRemoteSensorManager.SensorDat
             Log.w(TAG, "Not started, should not be called.");
             return null;
         }
-        SensorDataSet sensorDataSet = null;
-        BluetoothRemoteSensorManager localRemoteSensorManager = remoteSensorManager;
-        if (localRemoteSensorManager != null) {
-            sensorDataSet = localRemoteSensorManager.fill(trackPoint);
-        }
-        AltitudeSumManager localAltitudeSumManager = altitudeSumManager;
-        if (localAltitudeSumManager != null) {
-            localAltitudeSumManager.fill(trackPoint);
-        }
 
-        return sensorDataSet;
+        return sensorManager.fill(trackPoint);
     }
 
     public synchronized void stop() {
-        gpsHandler.onStop();
+        gpsManager.stop(context);
-
-        if (remoteSensorManager != null) {
-            remoteSensorManager.stop();
-            remoteSensorManager = null;
-        }
-
-        if (altitudeSumManager != null) {
-            altitudeSumManager.stop(context);
-            altitudeSumManager = null;
-        }
 
         this.context = null;
     }
@@ -125,7 +94,7 @@ public class TrackPointCreator implements BluetoothRemoteSensorManager.SensorDat
     public void onNewTrackPoint(@NonNull TrackPoint trackPoint) {
         addSensorData(trackPoint);
 
-        boolean stored = service.newTrackPoint(trackPoint, gpsHandler.getThresholdHorizontalAccuracy());
+        boolean stored = service.newTrackPoint(trackPoint, gpsManager.getThresholdHorizontalAccuracy());
         if (stored) {
             reset();
         }
@@ -169,26 +138,8 @@ public class TrackPointCreator implements BluetoothRemoteSensorManager.SensorDat
     }
 
     @VisibleForTesting
-    public AltitudeSumManager getAltitudeSumManager() {
+    public SensorManager getSensorManager() {
-        return altitudeSumManager;
+        return sensorManager;
-    }
-
-    @Deprecated
-    @VisibleForTesting
-    public void setAltitudeSumManager(AltitudeSumManager altitudeSumManager) {
-        this.altitudeSumManager = altitudeSumManager;
-    }
-
-    @Deprecated
-    @VisibleForTesting
-    public BluetoothRemoteSensorManager getRemoteSensorManager() {
-        return remoteSensorManager;
-    }
-
-    @Deprecated
-    @VisibleForTesting
-    public void setRemoteSensorManager(BluetoothRemoteSensorManager remoteSensorManager) {
-        this.remoteSensorManager = remoteSensorManager;
     }
 
     @VisibleForTesting
@@ -202,8 +153,8 @@ public class TrackPointCreator implements BluetoothRemoteSensorManager.SensorDat
     }
 
     @VisibleForTesting
-    public GPSHandler getGpsHandler() {
+    public GPSManager getGpsHandler() {
-        return gpsHandler;
+        return gpsManager;
     }
 
     void sendGpsStatus(GpsStatusValue gpsStatusValue) {

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

@@ -28,6 +28,7 @@ import androidx.preference.DialogPreference;
 import androidx.preference.PreferenceDialogFragmentCompat;
 
 import de.dennisguse.opentracks.R;
+import de.dennisguse.opentracks.data.models.ActivityType;
 import de.dennisguse.opentracks.fragments.ChooseActivityTypeDialogFragment;
 import de.dennisguse.opentracks.util.TrackIconUtils;
 
@@ -79,7 +80,7 @@ public class ActivityTypePreference extends DialogPreference {
             textView = view.findViewById(R.id.activity_type_preference_text_view);
             String category = PreferencesUtils.getDefaultActivity();
             textView.setText(category);
-            ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(context, R.array.activity_types, android.R.layout.simple_dropdown_item_1line);
+            ArrayAdapter<String> adapter = new ArrayAdapter<>(context, android.R.layout.simple_dropdown_item_1line, ActivityType.getLocalizedStrings(context));
             textView.setAdapter(adapter);
             textView.setOnItemClickListener((parent, v, position, id) -> {
                 String iconValue = TrackIconUtils.getIconValue(context, (String) textView.getAdapter().getItem(position));

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

@@ -68,18 +68,10 @@ public class DefaultsSettingsFragment extends PreferenceFragmentCompat implement
 
         ListPreference statsRatePreferences = findPreference(getString(R.string.stats_rate_key));
 
-        int entriesId;
+        int entriesId = switch (unitSystem) {
-        switch (unitSystem) {
+            case METRIC -> R.array.stats_rate_metric_options;
-            case METRIC:
+            case IMPERIAL, NAUTICAL_IMPERIAL -> R.array.stats_rate_imperial_options;
-                entriesId = R.array.stats_rate_metric_options;
+        };
-                break;
-            case IMPERIAL:
-            case NAUTICAL_IMPERIAL:
-                entriesId = R.array.stats_rate_imperial_options;
-                break;
-            default:
-                throw new RuntimeException("Not implemented");
-        }
 
         String[] entries = getResources().getStringArray(entriesId);
         statsRatePreferences.setEntries(entries);

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

@@ -64,7 +64,7 @@ public class ImportExportSettingsFragment extends PreferenceFragmentCompat {
             DocumentFile directory = IntentUtils.toDocumentFile(getContext(), directoryUri);
             //Use same value for not set as Androidx ListPreference and EditTextPreference
             if (directory == null) {
-                return getString(R.string.not_set);
+                return getString(androidx.preference.R.string.not_set);
             }
 
             return directoryUri + (directory.canWrite() ? "" : getString(R.string.export_dir_not_writable));

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

@@ -49,11 +49,6 @@ public class MainSettingsFragment extends PreferenceFragmentCompat {
             ((SettingsActivity) getActivity()).openScreen(getString(R.string.settings_api_key));
             return true;
         });
-
-        findPreference(getString(R.string.settings_open_tracks_key)).setOnPreferenceClickListener(preference -> {
-            ((SettingsActivity) getActivity()).openScreen(getString(R.string.settings_open_tracks_key));
-            return true;
-        });
     }
 
     @Override

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

@@ -1,21 +0,0 @@
-package de.dennisguse.opentracks.settings;
-
-import android.os.Bundle;
-
-import androidx.preference.PreferenceFragmentCompat;
-
-import de.dennisguse.opentracks.R;
-
-public class OpenTracksSettingsFragment extends PreferenceFragmentCompat {
-
-    @Override
-    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
-        addPreferencesFromResource(R.xml.settings_open_tracks);
-    }
-
-    @Override
-    public void onStart() {
-        super.onStart();
-        ((SettingsActivity) getActivity()).getSupportActionBar().setTitle(R.string.settings_open_tracks_title);
-    }
-}