Cleanup.

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

@@ -51,12 +51,14 @@ public class TrackRecordingServiceConnection implements ServiceConnection, Death
 
     private TrackRecordingServiceInterface trackRecordingService;
 
+    public TrackRecordingServiceConnection() {
+        callback = null;
+    }
+
     /**
-     * Constructor.
-     *
      * @param callback the callback to invoke when the service binding changes
      */
-    public TrackRecordingServiceConnection(Runnable callback) {
+    public TrackRecordingServiceConnection(@NonNull Runnable callback) {
         this.callback = callback;
     }
 

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

@@ -23,6 +23,7 @@ import android.content.SharedPreferences;
 import android.util.Log;
 
 import de.dennisguse.opentracks.R;
+import de.dennisguse.opentracks.content.sensor.SensorData;
 import de.dennisguse.opentracks.content.sensor.SensorDataCycling;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
 import de.dennisguse.opentracks.util.BluetoothUtils;
@@ -148,7 +149,7 @@ public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.
     }
 
     @Override
-    public synchronized void onChanged(de.dennisguse.opentracks.content.sensor.SensorData sensorData) {
+    public synchronized void onChanged(SensorData sensorData) {
         if (sensorData instanceof SensorDataCycling.Cadence) {
             if (sensorData.equals(sensorDataSet.getCyclingCadence())) {
                 Log.d(TAG, "onChanged: cadence data repeated.");