Android：连续播放多个音频文件时声音重叠

Question

我试图连续播放多个音频文件。我使用MediaPlayer class来播放多个音频文件。但是，当我在模拟器或手机上进行测试时，我无法弄清为什么声音重叠。我的代码的相关部分如下：

private MediaPlayer mPlayer1 = new MediaPlayer(); 
    private MediaPlayer mPlayer2 = new MediaPlayer(); 
    private AudioManager audioManager; 


    public void permissionGrantedActions() { 

    Uri uri1=Uri.parse("android.resource://com.android.packageName/" + mFile1); 
    try{mPlayer1.setDataSource(getActivity(), uri1); 
    }catch (IOException e) { 
     e.printStackTrace(); 
    } 

    mPlayer1.setAudioStreamType(AudioManager.STREAM_VOICE_CALL); 
    mPlayer1.prepareAsync(); 


    mPlayer1.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { 
     public void onPrepared(MediaPlayer mp) { 
      AppLog.logString("Start Playing Sound1"); 
      mPlayer1.start(); 
     } 
    }); 

    mPlayer1.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { 
     @Override 
     public void onCompletion(MediaPlayer mp) { 
      // TODO Auto-generated method stub 
      mPlayer1.stop(); 

      try { 
       mPlayer1.reset(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

      mPlayer1.release(); 
      AppLog.logString("Stop Playing Sound1"); 
     } 
    }); 

    mPlayer2.reset(); 

    Uri uri2=Uri.parse("android.resource://com.android.packageName/" + mFile2); 
    try { 
     mPlayer2.setDataSource(getActivity(), uri2); 
    }catch (IOException e) { 
     e.printStackTrace(); 
    } 

    mPlayer2.setAudioStreamType(AudioManager.STREAM_VOICE_CALL); 
    mPlayer2.prepareAsync(); 

    mPlayer2.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { 
     public void onPrepared(MediaPlayer mp) { 
      AppLog.logString("Start Playing Sound2"); 
      mPlayer2.start(); 
     } 
    }); 

    mPlayer2.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { 
     @Override 
     public void onCompletion(MediaPlayer mp) { 
      // TODO Auto-generated method stub 
      mPlayer2.stop(); 

      try { 
       mPlayer2.reset(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 

      mPlayer2.release(); 
      AppLog.logString("Stop Playing Sound2"); 
     } 
    }); 
... 
} 

使用上面的方法，声音是重叠的（每个音频文件约1秒长，使用此代码时，所有4个音频文件都在1秒内打出.. ）。任何想法为什么这样做？

Answer 1

好MediaPlayer正在asynchron，你可以在这里看到mPlayer1.prepareAsync();
你需要做的是从setOnCompletionListener 以前的MediaPlayer的启动它们。 像这样：

//init here 
mPlayer1.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { 
    @Override 
    public void onCompletion(MediaPlayer mp) { 
     // TODO Auto-generated method stub 
     mPlayer1.stop(); 

     try { 
      mPlayer1.reset(); 
      mPlayer2.setOnPreparedListener(new 
      MediaPlayer.OnPreparedListener() { 
       public void onPrepared(MediaPlayer mp) { 
        AppLog.logString("Start Playing Sound2"); 
        mPlayer2.start(); 
       } 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

     mPlayer1.release(); 
     AppLog.logString("Stop Playing Sound1"); 
    } 
});