setOnCompletionListener is detecting the completion only for first time

Question

setOnCompletionListener is detecting the completion of a song the first time only. In the code below song1 and song2 are played one after the other but the remaining songs are not being played.

I want to play the songs one by one and add some silence between songs.

MediaPlayer song0=new MediaPlayer();
     int track = 0;
  protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
  song0=MediaPlayer.create(this,R.raw.song1);
 play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
               function();
             }
        });

        song0.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer song0) {
                track++;
                loadsong();

                function();
            }

        });
    }
    void loadsong()
    {

        if(track==1)        song0=MediaPlayer.create(this,R.raw.song2);
        if(track==2)        song0=MediaPlayer.create(this,R.raw.song3);
        if(track==3)        song0=MediaPlayer.create(this,R.raw.song4);
    }**strong text**


    void function(){
        if(track<4) song0.start();
        else
            song0.stop();

    }

Answer 1

Your onclickListener event only starting for once. If you want to play song one by one you have to create a loop or have to do it recursively. Here's a snippet where I used song0.setOnCompletionListener inside loadsong() and in the event recursively called loadsong() every time. Changed your loadsong() method a little bit. Here is the code:

public class MainActivity extends AppCompatActivity {
private Button play;
MediaPlayer song0 = new MediaPlayer();
int track = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    play = findViewById(R.id.play);

    play.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            loadsong();
        }
    });


}


void loadsong() {
    track++;
    if (track == 1) {
        song0 = MediaPlayer.create(this, R.raw.track1);
        song0.start();
    }else if (track == 2) {
        song0 = MediaPlayer.create(this, R.raw.track2);
        song0.start();
    }else if (track == 3) {
        song0 = MediaPlayer.create(this, R.raw.track3);
        song0.start();
    }else if (track > 3) {
        song0.stop();
    }

    song0.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer song) {
            song.stop();
            loadsong();
        }
    });

}

}