Question

我有一个包含本地资源（音频文件）的所有资源ID的数组。我试图逐个播放所有这些文件。为此，我在Media Player的setOnCompletionListener事件上播放下一个文件，如下所示： -

mMediaPlayer.setOnCompletionListener();

连续播放文件的完整代码如下： -

代码

private void playing(){
  MediaPlayer mMediaPlayer = new MediaPlayer();
  mMediaPlayer = MediaPlayer.create(this, Constants.mAudioIds[play]);  // next file will be played
  mMediaPlayer.start();
  mMediaPlayer.setOnCompletionListener(new OnCompletionListener(){
      @Override
     public void onCompletion(MediaPlayer mp) {
                // TODO Auto-generated method stub
        play +=1;
        playing();
     }

    });
}

如果我单独播放所有文件，它们播放效果非常好。但是使用上面的代码，我在MediaPlayer中遇到错误。下面是堆栈跟踪。

栈跟踪

01-17 20:52:10.088: INFO/MediaPlayer(379): Info (1,44)
01-17 20:52:10.358: DEBUG/dalvikvm(215): GC freed 43 objects / 2096 bytes in 108ms
01-17 20:52:15.368: WARN/MediaPlayer(379): info/warning (1, 26)
01-17 20:52:15.410: ERROR/PlayerDriver(31): Command PLAYER_PREPARE completed with an error or info PVMFErrResource
01-17 20:52:15.419: ERROR/MediaPlayer(379): error (1, -17)
01-17 20:52:15.462: WARN/PlayerDriver(31): PVMFInfoErrorHandlingComplete
01-17 20:52:15.568: DEBUG/MediaPlayer(379): create failed:
01-17 20:52:15.568: DEBUG/MediaPlayer(379): java.io.IOException: Prepare failed.: status=0x1
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at android.media.MediaPlayer.prepare(Native Method)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at android.media.MediaPlayer.create(MediaPlayer.java:644)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at com.media.sample.ui.AutoPlay.playing(AutoPlay.java:162)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at com.media.sample.ui.AutoPlay.access$0(AutoPlay.java:138)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at com.media.sample.ui.AutoPlay$1.onCompletion(AutoPlay.java:171)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at android.media.MediaPlayer$EventHandler.handleMessage(MediaPlayer.java:1157)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at android.os.Looper.loop(Looper.java:123)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at android.app.ActivityThread.main(ActivityThread.java:4363)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at java.lang.reflect.Method.invokeNative(Native Method)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at java.lang.reflect.Method.invoke(Method.java:521)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
01-17 20:52:15.568: DEBUG/MediaPlayer(379):     at dalvik.system.NativeStart.main(Native Method)

此外，相同的代码在极少数设备中运行完美（但在大多数设备+模拟器中），它提供了上述异常。

请为此提供一些解决方案。

Answer 1

您需要参考状态图和图表，其中概述了媒体播放器可以处于的状态以及可以在哪种状态下调用哪些方法。 http://developer.android.com/reference/android/media/MediaPlayer.html#Valid_and_Invalid_States

因此，媒体播放器可能有点棘手。

Answer 2

您需要调用 prepareAsync（），如：

private void playing(){
  MediaPlayer mMediaPlayer = new MediaPlayer();
  mMediaPlayer = MediaPlayer.create(this, Constants.mAudioIds[play]);  
  mMediaPlayer.prepareAsync();

  mMediaPlayer.setOnCompletionListener(new OnCompletionListener(){
      @Override
     public void onCompletion(MediaPlayer mp) {
                // TODO Auto-generated method stub
        play +=1;
        playing();
     }

    });
}

 @Override
 public void onPrepared(MediaPlayer mp) {
  Log.d(TAG, "Stream is prepared");
  mp.start();
 }

Complete example is here

播放音频文件时出现异常

2 个答案: