在android中循环声音文件

Question

这段代码在初始循环中运行良好。然而，一旦我停止并再次点击循环按钮，文件就会混淆并按顺序播放。有人知道是怎么回事吗?如有任何帮助，不胜感激。

public class OneExp extends ActionBarActivity {
private ListView lv; 
private ArrayAdapter<String> arrayAdapter;
private MediaPlayer mp;
private MediaPlayer mp2;
int[] myAudio = {R.raw.e_1101, R.raw.e_1102, R.raw.e_1103, R.raw.e_1104, R.raw.e_1105,
        R.raw.e_1106, R.raw.e_1107, R.raw.e_1108, R.raw.e_1109, R.raw.e_1110, R.raw.e_1111};
int mCompleted = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.one_exp);
    Button btnLoop = (Button) findViewById(R.id.button1);
    Button btnStop = (Button) findViewById(R.id.button2);
    btnStop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (mp2 != null) {
                if (mp2.isPlaying()) {
                    mp2.stop();
                }
                mp2.reset();
                mp2.release();
                mp2 = null;
            }
            }
    });
    btnLoop.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            mp2 = MediaPlayer.create(getBaseContext(), myAudio[0]);
            mp2.setOnCompletionListener(new OnCompletionListener() 
            {
                @Override
                public void onCompletion(MediaPlayer mp2)
                {
                    mCompleted++;
                    mp2.reset();
                    if (mCompleted < myAudio.length) 
                    {
                        try
                        {
                            AssetFileDescriptor afd = getResources().openRawResourceFd(myAudio[mCompleted]);
                            if (afd != null) 
                            {
                                mp2.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
                                afd.close();
                                mp2.prepare();
                                mp2.start();
                            }
                        }
                        catch (Exception ex) 
                        {
                           ex.printStackTrace();
                        }
                    } 
                    else if (mCompleted>=myAudio.length) 
                    {
                        mCompleted =0;
                        try
                        {
                            AssetFileDescriptor afd = getResources().openRawResourceFd(myAudio[mCompleted]);
                            if (afd != null) 
                            {
                                mp2.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
                                afd.close();
                                mp2.prepare();
                                mp2.start();
                            }
                        }
                        catch (Exception ex) 
                        {
                           ex.printStackTrace();
                        }
                    }
                    else
                    {
                        mCompleted=0;
                         mp2.release();
                         mp2 = null;
                    }
                }
            });

            mp2.start();  
        }
    });

Answer 1

看看http://developer.android.com/reference/android/media/MediaPlayer.html#setLooping(boolean

为什么你想使用这么多代码当你可以很容易地使用start()， stop()， pause()和setloops (true)代替?

在我看来，没有必要检查音频的长度。

当你调用pause()和之后的start()，你的音频将继续在原来的地方。

只有在完全处理完文件后才调用release/reset。