在MediaPlayer中连续播放声音时应用崩溃

Question

I found the following code as an answer to a question here Playing multiple files in MediaPlayer one after other In android

When I run it, the 3 sounds are played but then the app closes with the message

unfortunately the application has stopped.

Is there something missing inside the onCompletion method?

public class MainActivity extends Activity implements MediaPlayer.OnCompletionListener {

    int[] tracks = new int[3];
    int currentTrack = 0;
    private MediaPlayer mediaPlayer = null;

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

        tracks[0] = R.raw.p46;
        tracks[1] = R.raw.p52;
        tracks[2] = R.raw.p55;
        mediaPlayer = MediaPlayer.create(getApplicationContext(), tracks[currentTrack]);
        mediaPlayer.setOnCompletionListener(this);
        mediaPlayer.start();
    }

    public void onCompletion(MediaPlayer arg0) {
        arg0.release();
        if (currentTrack < tracks.length) {
            currentTrack++;
            arg0 = MediaPlayer.create(getApplicationContext(), tracks[currentTrack]);
            arg0.setOnCompletionListener(this);
            arg0.start();
        }
    }

Answer 1

Change this:

public void onCompletion(MediaPlayer arg0) {
        arg0.release();
        if (currentTrack < tracks.length) {
            currentTrack++;
            arg0 = MediaPlayer.create(getApplicationContext(), tracks[currentTrack]);
            arg0.setOnCompletionListener(this);
            arg0.start();
        }
    }

to :

public void onCompletion(MediaPlayer arg0) {
        arg0.release();
        currentTrack++;
        if (currentTrack < tracks.length) {

            arg0 = MediaPlayer.create(getApplicationContext(), tracks[currentTrack]);
            arg0.setOnCompletionListener(this);
            arg0.start();
        }
    }

basically you are getting a ArrayIndexOutofBoundException becoz at last currentTrack is 3 and and there is no item at index 3 ie 4th item