repeat audio in mediaplayer

for repeat audio in mediaplayer write this code but not work correct :

seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
      @Override
      public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
        if (b) {
          G.mediaPlayer.seekTo(i);
        }
        if (i >= G.mediaPlayer.getDuration()) {
          if (isRepeat) {
            G.mediaPlayer.seekTo(0);
            G.mediaPlayer.start();
          }else {
            G.mediaPlayer.seekTo(0);
            G.mediaPlayer.pause();
          }
        }
      }

and for play audio do this :

    public void playSongWithIndex(final int songIndex) {
    progressBar.setVisibility(View.VISIBLE);
    if (music_exist.exists()) {
      playMusicOfflineMode();
    } else {
      try {
        G.mediaPlayer.reset();
        G.mediaPlayer.setDataSource(songList.get(songIndex).getFile_128());
        G.mediaPlayer.prepareAsync();
        G.mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
          @Override
          public void onPrepared(MediaPlayer mediaPlayer) {
            runOnUiThread(new Runnable() {
              @Override
              public void run() {

              }
            });

            G.mediaPlayer.start();
            seekBar.setMax(G.mediaPlayer.getDuration());
            progressBar.setVisibility(View.INVISIBLE);

            timer = new Timer();
            timer.schedule(new MainTimer(), 0, 1000);

          }
        });
      } catch (IllegalArgumentException | IllegalStateException | IOException e) {
        e.printStackTrace();
      }
    }
  }

but repeat audio some times work done and sometimes when seekbar well be over stop and do not work . please help me how to repeat audio ?