fix receiver not being started on subsequent app launches

app/src/main/java/com/illusionman1212/lyricsgrabbr/MainActivity.kt

@@ -51,7 +51,8 @@ data class NotificationEvent(
 )
 
 class MainActivity : ComponentActivity() {
-    var lastNotification: MutableStateFlow<NotificationEvent?> = MutableStateFlow(null)
+    private var lastNotification: MutableStateFlow<NotificationEvent?> = MutableStateFlow(null)
+    private var isReceiverRunning = false
 
     override fun onCreate(savedInstanceState: Bundle?) {
         installSplashScreen()
@@ -163,9 +164,7 @@ class MainActivity : ComponentActivity() {
     }
 
     private fun startListening() {
-        val isServiceRunning = NotificationListener.isRunning.value
-
-        if (!isPermissionGranted() || isServiceRunning) {
+        if (!isPermissionGranted() || isReceiverRunning) {
             return
         }
 
@@ -176,6 +175,7 @@ class MainActivity : ComponentActivity() {
         filter.addAction(NotificationListener.NOTIFICATION_INTENT)
         LocalBroadcastManager.getInstance(applicationContext).registerReceiver(NotificationReceiver(), filter)
         ContextCompat.startForegroundService(applicationContext, listenerIntent)
+        isReceiverRunning = true
     }
 
     inner class NotificationReceiver: BroadcastReceiver() {

app/src/main/java/com/illusionman1212/lyricsgrabbr/NotificationListener.kt

@@ -19,9 +19,6 @@ import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
 import androidx.core.content.ContextCompat
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.flow.update
 
 class NotificationListener: NotificationListenerService() {
     private var notificationManager : NotificationManagerCompat? = null
@@ -60,13 +57,10 @@ class NotificationListener: NotificationListenerService() {
 
     private fun getStopServiceNotificationAction(): PendingIntent {
         val intent = Intent(android.provider.Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
-        val pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE)
-        return pendingIntent
+        return PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE)
     }
 
     private fun startForegroundService() {
-        _isRunning.update { true }
-
         startForeground(NOTIFICATION_ID, getInitialNotification())
     }
 
@@ -167,9 +161,6 @@ class NotificationListener: NotificationListenerService() {
     }
 
     companion object {
-        private val _isRunning = MutableStateFlow(false)
-        val isRunning = _isRunning.asStateFlow()
-
         const val NOTIFICATION_INTENT = "notification_event"
         const val NOTIFICATION_PACKAGE_NAME = "package_name"
         const val NOTIFICATION_PACKAGE_ARTIST = "package_artist"