Bugfix: crash when exporting zero tracks.

Fixes #2285

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

@@ -167,8 +167,11 @@ public class ExportActivity extends AbstractActivity {
             new Thread(() -> {
                 directoryFiles = ExportUtils.getAllFiles(ExportActivity.this, documentFile.getUri());
                 runOnUiThread(() -> {
-                    createExportTasks(allInOneFile);
-                    nextExport(null);
+                    if (createExportTasks(allInOneFile)) {
+                        nextExport(null);
+                    } else {
+                        onExportEnded();
+                    }
                 });
             }).start();
         } else {
@@ -217,8 +220,12 @@ public class ExportActivity extends AbstractActivity {
         exportTasks.clear();
     }
 
-    private void createExportTasks(boolean allInOneFile) {
+    private boolean createExportTasks(boolean allInOneFile) {
         List<Track> tracks = contentProviderUtils.getTracks();
+        if (tracks.isEmpty()) {
+            return false;
+        }
+
         exportTasks = new ArrayList<>();
         if (allInOneFile) {
             String filename = "OpenTracks-Backup";
@@ -227,6 +234,7 @@ public class ExportActivity extends AbstractActivity {
             exportTasks.addAll(tracks.stream().map(it -> new ExportTask(null, trackFileFormat, List.of(it.id()))).toList());
         }
         trackExportTotalCount = exportTasks.size();
+        return true;
     }
 
     /**
@@ -391,7 +399,7 @@ public class ExportActivity extends AbstractActivity {
 
         /**
          * Try to resolve the conflict if user gave the info needed.
-         * Otherwise shows the buttons and views needed to gives the user the possibility of take a decision.
+         * Otherwise, shows the buttons and views needed to gives the user the possibility of take a decision.
          *
          * @return true if it could resolve the conflict or false otherwise.
          */

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

@@ -14,7 +14,6 @@ import java.time.Instant;
 
 import de.dennisguse.opentracks.data.models.Cadence;
 import de.dennisguse.opentracks.data.models.Distance;
-import de.dennisguse.opentracks.data.models.HeartRate;
 import de.dennisguse.opentracks.data.models.Position;
 import de.dennisguse.opentracks.data.models.Speed;
 import de.dennisguse.opentracks.sensors.sensorData.AggregatorCyclingCadence;
@@ -186,17 +185,6 @@ public class SensorManager implements SharedPreferences.OnSharedPreferenceChange
         return handler;
     }
 
-    private SensorData<HeartRate> getHeartRate(Instant now) {
-        SensorData<HeartRate> value = heartRateHandler.getSensorData(now);
-        if (value != null) {
-
-            //TODO Move this check into HeartRateHandler
-            if (value.data().isValid()) return value;
-        }
-
-        return null;
-    }
-
     private SensorData<Cadence> getCadence(Instant now) {
         {
             SensorData<Cadence> value = cyclingCadenceHandler.getSensorData(now);
@@ -263,7 +251,7 @@ public class SensorManager implements SharedPreferences.OnSharedPreferenceChange
                 gpsSensorData,
                 getSpeed(now),
                 getDistance(now),
-                getHeartRate(now),
+                heartRateHandler.getSensorData(now),
                 temperatureHandler.getSensorData(now),
                 getCadence(now),
                 cyclingPowerHandler.getSensorData(now),

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

@@ -34,7 +34,7 @@ public abstract class Aggregator<InputType, OutputType> {
         previous = next;
     }
 
-    protected abstract void computeValue(Raw<InputType> current);
+    protected abstract void computeValue(@NonNull Raw<InputType> current);
 
     /**
      * @return did we process data from a sensor.

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

@@ -1,5 +1,7 @@
 package de.dennisguse.opentracks.sensors.sensorData;
 
+import androidx.annotation.NonNull;
+
 import de.dennisguse.opentracks.data.models.AltitudeGainLoss;
 import de.dennisguse.opentracks.data.models.AtmosphericPressure;
 import de.dennisguse.opentracks.sensors.PressureSensorUtils;
@@ -13,7 +15,7 @@ public class AggregatorBarometer extends Aggregator<AtmosphericPressure, Altitud
     }
 
     @Override
-    protected void computeValue(Raw<AtmosphericPressure> current) {
+    protected void computeValue(@NonNull Raw<AtmosphericPressure> current) {
         if (previous == null) {
             lastAcceptedSensorValue = current.value();
             output = new AltitudeGainLoss(0f, 0f);

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

@@ -2,6 +2,8 @@ package de.dennisguse.opentracks.sensors.sensorData;
 
 import android.util.Log;
 
+import androidx.annotation.NonNull;
+
 import java.time.Duration;
 
 import de.dennisguse.opentracks.data.models.Cadence;
@@ -17,7 +19,7 @@ public class AggregatorCyclingCadence extends Aggregator<CyclingCadenceBluetooth
     }
 
     @Override
-    protected void computeValue(Raw<CyclingCadenceBluetooth.CrankData> current) {
+    protected void computeValue(@NonNull Raw<CyclingCadenceBluetooth.CrankData> current) {
         if (previous == null) {
             return;
         }

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

@@ -2,6 +2,8 @@ package de.dennisguse.opentracks.sensors.sensorData;
 
 import android.util.Log;
 
+import androidx.annotation.NonNull;
+
 import java.time.Duration;
 
 import de.dennisguse.opentracks.data.models.Distance;
@@ -20,7 +22,7 @@ public class AggregatorCyclingDistanceSpeed extends Aggregator<CyclingDistanceSp
     }
 
     @Override
-    protected void computeValue(Raw<CyclingDistanceSpeedBluetooth.WheelData> current) {
+    protected void computeValue(@NonNull Raw<CyclingDistanceSpeedBluetooth.WheelData> current) {
         if (previous == null) {
             return;
         }

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

@@ -1,5 +1,7 @@
 package de.dennisguse.opentracks.sensors.sensorData;
 
+import androidx.annotation.NonNull;
+
 import de.dennisguse.opentracks.data.models.Power;
 import de.dennisguse.opentracks.sensors.driver.CyclingPowerBluetooth;
 
@@ -10,7 +12,7 @@ public class AggregatorCyclingPower extends Aggregator<CyclingPowerBluetooth.Dat
     }
 
     @Override
-    public void computeValue(Raw<CyclingPowerBluetooth.Data> current) {
+    public void computeValue(@NonNull Raw<CyclingPowerBluetooth.Data> current) {
         this.output = current.value().power();
     }
 }

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

@@ -2,6 +2,8 @@ package de.dennisguse.opentracks.sensors.sensorData;
 
 import android.location.Location;
 
+import androidx.annotation.NonNull;
+
 import de.dennisguse.opentracks.data.models.Position;
 
 public class AggregatorGPS extends Aggregator<Location, Position> {
@@ -11,7 +13,7 @@ public class AggregatorGPS extends Aggregator<Location, Position> {
     }
 
     @Override
-    protected void computeValue(Raw<Location> current) {
+    protected void computeValue(@NonNull Raw<Location> current) {
         output = Position.of(current.value(), current.time());
     }
 

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

@@ -1,5 +1,7 @@
 package de.dennisguse.opentracks.sensors.sensorData;
 
+import androidx.annotation.NonNull;
+
 import de.dennisguse.opentracks.data.models.HeartRate;
 
 public class AggregatorHeartRate extends Aggregator<HeartRate, HeartRate> {
@@ -9,7 +11,7 @@ public class AggregatorHeartRate extends Aggregator<HeartRate, HeartRate> {
     }
 
     @Override
-    protected void computeValue(Raw<HeartRate> current) {
+    protected void computeValue(@NonNull Raw<HeartRate> current) {
         if (current.value().isValid()) {
             this.output = current.value();
         }

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

@@ -19,7 +19,7 @@ public final class AggregatorRunning extends Aggregator<RunningSpeedAndCadenceBl
     }
 
     @Override
-    public void computeValue(Raw<RunningSpeedAndCadenceBluetooth.Data> current) {
+    public void computeValue(@NonNull Raw<RunningSpeedAndCadenceBluetooth.Data> current) {
         if (previous == null) {
             return;
         }

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

@@ -1,5 +1,7 @@
 package de.dennisguse.opentracks.sensors.sensorData;
 
+import androidx.annotation.NonNull;
+
 import java.time.Duration;
 
 import de.dennisguse.opentracks.data.models.Temperature;
@@ -10,7 +12,7 @@ public class AggregatorTemperature extends Aggregator<Temperature, Temperature>
         super(sensorAddress, sensorName);
     }
 
-    protected void computeValue(Raw<Temperature> current) {
+    protected void computeValue(@NonNull Raw<Temperature> current) {
         this.output = current.value();
     }
 

src/main/java/de/dennisguse/opentracks/ui/customRecordingLayout/RecordingLayoutIO.java

@@ -5,6 +5,7 @@ import android.util.Log;
 
 import androidx.annotation.NonNull;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -22,7 +23,7 @@ public class RecordingLayoutIO {
     public static List<RecordingLayout> fromCsv(@NonNull String csv, @NonNull Resources resources) {
         return CsvLayoutUtils.getCsvLines(csv).stream()
                 .map(line -> RecordingLayoutIO.fromCsvLine(line, resources))
-                .toList();
+                .collect(Collectors.toCollection(ArrayList::new));
     }
 
     public static RecordingLayout fromCsvLine(@NonNull String csvLine, @NonNull Resources resources) {