Stopping MediaPlayer on fullscreen ads?

Question

Java

On the first activity, a full-screen ad (AdMob) is loaded
. There is a second activity. The game itself. It starts playing music as soon as the activity starts. Music is played using MedaiPlayer, also I pause the music when the application is minimized and turn it off when the activity is closed.
Then in the Intent after startActivity() I show a full-screen ad. When it is closed, the music is superimposed on itself twice. Moreover, one thread then simply falls silent after 4-7 seconds. The next time the game shows a full screen (not at the start of the activity), the music is paused, and continues to play when the ad is closed.
1 Activity

Intent intent = new Intent(this, Game.class);
 startActivity(intent);
if (interstitial.isLoaded()) interstitial.show();

2 Activities

MediaPlayer mp;
int music;

//в onCreate
music = R.raw.m1;
playMusic();

//далее после onCreate
 void playMusic(){
        new Thread(){
            public void run(){
                MediaPlayer.create(Game.this, music);
                mp.start();

                mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){
                    public void onCompletion(MediaPlayer arg0){
                        arg0.start();
                    }
                });
            }
        }.start();
    }

 @Override
    public void onPause() {
        Game.super.onPause();
        if (mp != null) mp.pause();
    }

    @Override
    public void onResume() {
        Game.super.onResume();
        playMusic();
    }

Q: What is the reason for re-overlaying music when opening an activity and a full-screen ad? After all, with the further display, everything is in order. And what is the reason for the subsequent independent shutdown of one thread?

Answer 1

Well, apparently, you call playMusic in onCreate and in onResume, respectively, two Thread objects are created and inside each object a player is created. Here they are all playing together. and you stop only the one to which the last created one refers.