在MediaPlayer中連續播放聲音時應用崩潰

Question

我在這里找到以下代碼作為問題的答案： 在MediaPlayer中一個接一個地播放多個文件

當我運行它時，會播放3種聲音，但應用程序會關閉並顯示消息

不幸的是，該應用程序已停止。

onCompletion方法內是否缺少某些內容？

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

更改此：

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

至 ：

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

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

基本上你在最后一個currentTrack上得到一個ArrayIndexOutofBoundException becoz是3，並且索引3上沒有項目，即第4個項目