Clear widget when service is being shutdown

ultrasonic/src/main/kotlin/org/moire/ultrasonic/activity/NavigationActivity.kt

@@ -102,7 +102,6 @@ class NavigationActivity : AppCompatActivity() {
         Timber.d("onCreate called")
 
         // First check if Koin has been started
-
         if (UApp.instance != null && !UApp.instance!!.initiated) {
             Timber.d("Starting Koin")
             UApp.instance!!.startKoin()

ultrasonic/src/main/kotlin/org/moire/ultrasonic/playback/PlaybackService.kt

@@ -87,6 +87,9 @@ class PlaybackService : MediaLibraryService(), KoinComponent {
     }
 
     private fun releasePlayerAndSession() {
+        // Broadcast that the service is being shutdown
+        RxBus.stopCommandPublisher.onNext(Unit)
+
         player.release()
         mediaLibrarySession.release()
         rxBusSubscription.dispose()

ultrasonic/src/main/kotlin/org/moire/ultrasonic/provider/UltrasonicAppWidgetProvider.kt

@@ -97,6 +97,7 @@ open class UltrasonicAppWidgetProvider : AppWidgetProvider() {
         playing: Boolean,
         setAlbum: Boolean
     ) {
+        Timber.d("Updating Widget")
         val res = context.resources
         val views = RemoteViews(context.packageName, layoutId)
         val title = currentSong?.title

ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/MediaPlayerController.kt

@@ -166,6 +166,11 @@ class MediaPlayerController(
             }
         }
 
+        rxBusSubscription += RxBus.stopCommandObservable.subscribe {
+            // Clear the widget when we stop the service
+            updateWidget(null)
+        }
+
         created = true
         Timber.i("MediaPlayerController started")
     }

ultrasonic/src/main/kotlin/org/moire/ultrasonic/service/RxBus.kt

@@ -63,6 +63,12 @@ class RxBus {
             PublishSubject.create()
         val shutdownCommandObservable: Observable<Unit> =
             shutdownCommandPublisher.observeOn(mainThread())
+
+        val stopCommandPublisher: PublishSubject<Unit> =
+            PublishSubject.create()
+        val stopCommandObservable: Observable<Unit> =
+            stopCommandPublisher.observeOn(mainThread())
+
     }
 
     data class StateWithTrack(