GPS Status: TrackListActivity uses the value of gps status from the service to select appropiate icon.

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

@@ -698,4 +698,8 @@ public class TrackRecordingService extends Service implements HandlerServer.Hand
     public void setRemoteSensorManager(BluetoothRemoteSensorManager remoteSensorManager) {
         this.remoteSensorManager = remoteSensorManager;
     }
+
+    public GpsStatusValue getGpsStatus() {
+        return handlerServer.getGpsStatus();
+    }
 }

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

@@ -4,6 +4,7 @@ import androidx.annotation.VisibleForTesting;
 
 import de.dennisguse.opentracks.content.data.TrackPoint;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
+import de.dennisguse.opentracks.services.handlers.GpsStatusValue;
 import de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager;
 
 /**
@@ -27,6 +28,11 @@ class TrackRecordingServiceBinder extends android.os.Binder implements TrackReco
         trackRecordingService.addListener(listener);
     }
 
+    @Override
+    public GpsStatusValue getGpsStatus() {
+        return trackRecordingService.getGpsStatus();
+    }
+
     @Override
     public void startGps() {
         trackRecordingService.tryStartGps();

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

@@ -19,6 +19,7 @@ import androidx.annotation.VisibleForTesting;
 
 import de.dennisguse.opentracks.content.data.TrackPoint;
 import de.dennisguse.opentracks.content.sensor.SensorDataSet;
+import de.dennisguse.opentracks.services.handlers.GpsStatusValue;
 import de.dennisguse.opentracks.services.sensors.BluetoothRemoteSensorManager;
 
 /**
@@ -112,4 +113,6 @@ public interface TrackRecordingServiceInterface {
     void newTrackPoint(TrackPoint trackPoint, int recordingGpsAccuracy);
 
     void setListener(BoundServiceListener listener);
+
+    GpsStatusValue getGpsStatus();
 }

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

@@ -60,6 +60,10 @@ public class HandlerServer {
         service.newGpsStatus(gpsStatusValue);
     }
 
+    public GpsStatusValue getGpsStatus() {
+        return locationHandler.getGpsStatus();
+    }
+
     public interface HandlerServerInterface {
         void newTrackPoint(TrackPoint trackPoint, int gpsAccuracy);
         void newGpsStatus(GpsStatusValue gpsStatusValue);

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

@@ -90,6 +90,10 @@ class LocationHandler implements HandlerServer.Handler, LocationListener, GpsSta
      */
     @Override
     public void onLocationChanged(@NonNull Location location) {
+        if (gpsStatus != null) {
+            gpsStatus.onLocationChanged(location);
+        }
+
         if (!LocationUtils.isValidLocation(location)) {
             Log.w(TAG, "Ignore newTrackPoint. location is invalid.");
             return;
@@ -122,10 +126,16 @@ class LocationHandler implements HandlerServer.Handler, LocationListener, GpsSta
 
     @Override
     public void onProviderEnabled(@NonNull String provider) {
+        if (gpsStatus != null) {
+            gpsStatus.onGpsEnabled();
+        }
     }
 
     @Override
     public void onProviderDisabled(@NonNull String provider) {
+        if (gpsStatus != null) {
+            gpsStatus.onGpsDisabled();
+        }
     }
 
     private void registerLocationListener() {
@@ -161,4 +171,8 @@ class LocationHandler implements HandlerServer.Handler, LocationListener, GpsSta
     public void onGpsStatusChanged(GpsStatusValue prevStatus, GpsStatusValue currentStatus) {
         handlerServer.sendGpsStatus(currentStatus);
     }
+
+    public GpsStatusValue getGpsStatus() {
+        return gpsStatus != null ? gpsStatus.getGpsStatus() : GpsStatusValue.GPS_NONE;
+    }
 }