Android mediaplayer singleton service won't stop playing

Question

I need to have background music in all my activities. It should stop when the application is not foreground. As I'm developing for 2.3 I can't use the ActivityLifeCycleCallBacks class. I implemented the solution at Checking if an Android application is running in the background and then decided to make the mediaplayer a singleton and use it in a service.

Everything works fine and if I press home, select quit from the menu or I make the application go background any way the sound stops but... after some random time when I'm doing something else or even when the screen is turned off the music will start again out of the blue. Even if I kill the application from task manager the will start again later again.

This is my first singleton and my first time playing with service so I guess I'm missing something really basic. I think I'm closing the service but apparently I'm not. Here is the code:

PlayAudio.java

import ...
public class PlayAudio extends Service{
    private static final Intent Intent = null;
    MediaPlayer objPlayer;
    private int length = 0;
    boolean mIsPlayerRelease = true;
    private static PlayAudio uniqueIstance; //the singleton
    static PlayAudio mService;
    static boolean mBound = false; // boolean to check if the service containing this singleton is binded to some activity
    public static boolean activityVisible; // boolean to check if the activity using the player is foreground or not

//My attempt to make a singleton
public static PlayAudio getUniqueIstance(){
    if (uniqueIstance == null) {
        uniqueIstance = new PlayAudio();
    }
    return uniqueIstance;
}
public static boolean isActivityVisible() {
    return activityVisible;
  }  

  public static void activityResumed() {
    activityVisible = true;
  }

  public static void activityPaused() {
    activityVisible = false;
  }
static public ServiceConnection mConnection = new ServiceConnection() {// helper for the activity

    public void onServiceConnected(ComponentName className,
            IBinder service) {
        LocalBinder binder = (LocalBinder) service;
        mService = binder.getService();
        mBound = true;
    }

    public void onServiceDisconnected(ComponentName arg0) {
        mBound = false;
    }
};
public static Intent createIntent (Context context) { //helper for the activity using the player
    Intent intent = new Intent(context, PlayAudio.class);
    return intent;
}
private final IBinder mBinder = new LocalBinder();

public class LocalBinder extends Binder {
    PlayAudio getService() {
        // Return this instance so clients can call public methods
        return PlayAudio.this;
    }
}
@Override
public IBinder onBind(Intent intent) {
    return mBinder;
}
public void onCreate(){
    super.onCreate();
    Log.d(LOGCAT, "Service Started!");
    objPlayer = MediaPlayer.create(this,R.raw.kickstarterreduced);
    objPlayer.setLooping(true);
    mIsPlayerRelease = false;
}

public int onStartCommand(Intent intent, int flags, int startId){
    objPlayer.start();
    Log.d(LOGCAT, "Media Player started!");
    if(objPlayer.isLooping() != true){
        Log.d(LOGCAT, "Problem in Playing Audio");
    }
    return 1;
}

public void onStop(){
    objPlayer.setLooping(false);
    objPlayer.stop();
    objPlayer.release();
    mIsPlayerRelease = true;
}

public void onPause(){
    if(objPlayer.isPlaying())
    {
        objPlayer.pause();
        length=objPlayer.getCurrentPosition(); // save the position in order to be able to resume from here
    }   
}
public void resumeMusic() // if length is 0 the player just start from zero
{   if (mIsPlayerRelease == true) {
    objPlayer = MediaPlayer.create(this,R.raw.kickstarterreduced);
    mIsPlayerRelease = false;
}
    if(objPlayer.isPlaying()==false )
    {
        if (length != 0) objPlayer.seekTo(length);
        objPlayer.start();
    }
}

}

And this are the methods I have implemented in every activity's class

SharedPreferences sharedPrefs;
PlayAudio playerIstanced;
public static boolean activityVisible;
@Override
public void onStart() {
    super.onStart();
    sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this); 
   }
@Override
public void onResume() {
       super.onResume();
       playerIstanced= PlayAudio.getUniqueIstance(); //call singleton
       bindService(PlayAudio.createIntent(this), playerIstanced.mConnection, Context.BIND_AUTO_CREATE); // create the service
       if (sharedPrefs.getBoolean("sound", true) == true) {// if sound is enabled in option it will start the service
           startService(PlayAudio.createIntent(this));
           playerIstanced.mService.activityResumed();
           if (playerIstanced.mBound == true) {
           playerIstanced.mService.resumeMusic();
           }
       }

   }
   @Override
   public void onPause() {
       super.onPause();
       playerIstanced.mService.activityPaused();
       final Handler handler = new Handler();
       handler.postDelayed(new Runnable() {
         public void run() {
           //If the phone lags when changing activity (between onPause() and the other activity onResume() the music won't stop. If after 500ms onResume() is not called it means the activity went background...Am I messing with service here?
             if (playerIstanced.mService.isActivityVisible() != true) {
                 playerIstanced.mService.onPause();
             }
         }
       }, 500);

}
   @Override
   public void onStop(){
       super.onStop();
       // Unbind from the service
       if (playerIstanced.mService.mBound) {
           playerIstanced.mService.mBound = false;
           unbindService(playerIstanced.mService.mConnection);

       }
   }



}

Answer 1

Stop music automatically when user exit from app

This part has to be in EVERY activity's onPause:

public void onPause(){
    super.onPause();
        Context context = getApplicationContext();
                ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
                List<RunningTaskInfo> taskInfo = am.getRunningTasks(1);
                if (!taskInfo.isEmpty()) {
                  ComponentName topActivity = taskInfo.get(0).topActivity; 
                  if (!topActivity.getPackageName().equals(context.getPackageName())) {
                   StopPlayer();
                    Toast.makeText(xYourClassNamex.this, "YOU LEFT YOUR APP. MUSIC STOP", Toast.LENGTH_SHORT).show();
                  }
                }
      }

This part has to be in EVERY activity's onResume:

Play music automatically when user resume the app

Public void onResume()
    {
       super.onResume();
     StartPlayer();
    }

Hope it helps!! You can check my answer according to this topic may it will sove your issue.