Bluetooth sensors: event-driven TrackPoint creation.

Part of #500.

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

@@ -88,7 +88,6 @@ public class TrackRecordingService extends Service implements TrackPointCreator.
         @Override
         public void run() {
             updateRecordingDataWhileRecording();
-            trackPointCreator.onNewTrackPointWithoutGPS(); //TODO Should not be called every second, right? + with do some duplicate computation with updateRecordingDataWhileRecording().
 
             Handler localHandler = TrackRecordingService.this.handler;
             if (localHandler == null) {

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

@@ -121,7 +121,7 @@ public class GPSHandler implements LocationListener, GpsStatus.GpsStatusListener
         }
 
         lastTrackPoint = trackPoint;
-        trackPointCreator.onNewTrackPoint(trackPoint, thresholdHorizontalAccuracy);
+        trackPointCreator.onNewTrackPoint(trackPoint);
     }
 
     @Override

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

@@ -20,7 +20,7 @@ import de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager;
 /**
  * Creates TrackPoints while recording by fusing data from different sensors (e.g., GNSS, barometer, BLE sensors).
  */
-public class TrackPointCreator {
+public class TrackPointCreator implements BluetoothRemoteSensorManager.SensorDataSetChangeObserver {
 
     private static final String TAG = TrackPointCreator.class.getSimpleName();
 
@@ -51,10 +51,10 @@ public class TrackPointCreator {
 
         gpsHandler.onStart(context);
 
-        remoteSensorManager = new BluetoothRemoteSensorManager(context);
-        remoteSensorManager.start();
-
+        remoteSensorManager = new BluetoothRemoteSensorManager(context, this);
         altitudeSumManager = new AltitudeSumManager();
+
+        remoteSensorManager.start();
         altitudeSumManager.start(context);
     }
 
@@ -109,19 +109,25 @@ public class TrackPointCreator {
         gpsHandler.onSharedPreferenceChanged(key);
     }
 
-    public synchronized void onNewTrackPoint(@NonNull TrackPoint trackPoint, @NonNull Distance thresholdHorizontalAccuracy) {
+    /**
+     * Got a new TrackPoint from Bluetooth only; contains no GPS location.
+     *
+     * @param sensorDataSet
+     */
+    @Override
+    public void onChange(SensorDataSet sensorDataSet) {
+        onNewTrackPoint(new TrackPoint(TrackPoint.Type.SENSORPOINT, createNow()));
+    }
+
+    public synchronized void onNewTrackPoint(@NonNull TrackPoint trackPoint) {
         fill(trackPoint);
 
-        boolean stored = service.newTrackPoint(trackPoint, thresholdHorizontalAccuracy);
+        boolean stored = service.newTrackPoint(trackPoint, gpsHandler.getThresholdHorizontalAccuracy());
         if (stored) {
             resetSensorData();
         }
     }
 
-    public void onNewTrackPointWithoutGPS() {
-        onNewTrackPoint(new TrackPoint(TrackPoint.Type.SENSORPOINT, createNow()), gpsHandler.getThresholdHorizontalAccuracy());
-    }
-
     public TrackPoint createSegmentStartManual() {
         return TrackPoint.createSegmentStartManualWithTime(createNow());
     }

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

@@ -33,8 +33,8 @@ import de.dennisguse.opentracks.content.sensor.SensorData;
 import de.dennisguse.opentracks.content.sensor.SensorDataCycling;
 import de.dennisguse.opentracks.content.sensor.SensorDataRunning;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
-import de.dennisguse.opentracks.util.BluetoothUtils;
 import de.dennisguse.opentracks.settings.PreferencesUtils;
+import de.dennisguse.opentracks.util.BluetoothUtils;
 
 /**
  * Bluetooth LE sensor manager: manages connections to Bluetooth LE sensors.
@@ -71,6 +71,8 @@ public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.
 
     private final SensorDataSet sensorDataSet = new SensorDataSet();
 
+    private final SensorDataSetChangeObserver observer;
+
     private final SharedPreferences.OnSharedPreferenceChangeListener sharedPreferenceChangeListener = new SharedPreferences.OnSharedPreferenceChangeListener() {
         @Override
         public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
@@ -110,8 +112,9 @@ public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.
         }
     };
 
-    public BluetoothRemoteSensorManager(Context context) {
+    public BluetoothRemoteSensorManager(@NonNull Context context, @NonNull SensorDataSetChangeObserver observer) {
         this.context = context;
+        this.observer = observer;
         bluetoothAdapter = BluetoothUtils.getAdapter(context);
     }
 
@@ -208,10 +211,15 @@ public class BluetoothRemoteSensorManager implements BluetoothConnectionManager.
         }
 
         sensorDataSet.set(sensorData);
+        observer.onChange(new SensorDataSet(sensorDataSet));
     }
 
     @Override
     public void onDisconnecting(SensorData<?> sensorData) {
         sensorDataSet.remove(sensorData);
     }
+
+    public interface SensorDataSetChangeObserver {
+        void onChange(SensorDataSet sensorDataSet);
+    }
 }