How can I stop MediaPlayer when I leave my application, but not when I move to another Activity (Android Studio)

I am trying to make an game on android studio where background music plays continuously even when you switch activities, but I want the music to stop when the user leaves the application. I searched through stackoverflow and I tried to use this solution i found from here below:

public class BackgroundSoundService extends Service {
    private static final String TAG = null;
    MediaPlayer player;
    public IBinder onBind(Intent arg0) {

        return null;
    }
    @Override
    public void onCreate() {
        super.onCreate();
        player = MediaPlayer.create(this, R.raw.idil);
        player.setLooping(true); // Set looping
        player.setVolume(100,100);

    }
    public int onStartCommand(Intent intent, int flags, int startId) {
        player.start();
        return 1;
    }



    @Override
    public void onDestroy() {
        player.stop();
        player.release();
    }

}

The sound form the MediaPlayer plays in all the activities the problem is that the sound doesn't stop when I leave the app with the home button or when i lock the phone only when I actually close the help.

Please any help would be appreciated.

You can use process lifecycle to listen when app goes to background and stop it

1. Add dependencies in your build.gradle

    implementation "androidx.lifecycle:lifecycle-process:2.2.0"

2. Create custom Application, don't forget to declare it in AndroidManifest

    public class CustomApplication extends Application implements LifecycleObserver {
        @Override
        public void onCreate() {
            super.onCreate();
            ProcessLifecycleOwner.get().getLifecycle().addObserver(this);
        }

        @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
        public void onAppBackgrounded() {
            // your app come to background
            stopService(new Intent(this, BackgroundSoundService.class));
        }

        @OnLifecycleEvent(Lifecycle.Event.ON_START)
        public void onAppForegrounded() {
            // your app come to foreground
        }
    }