不斷從目錄中播放音頻文件

Question

我正在使用以下代碼從SD卡中的目錄不斷播放音頻文件。

我面臨的問題是所有文件都在一次播放。我需要一個接一個地玩。

mPlay.setOnClickListener(new OnClickListener(){ 

      @Override 
      public void onClick(View v) 
      { 
       // TODO Auto-generated method stub 
      getFiles(); 
      } 

      private void getFiles() { 
       // TODO Auto-generated method stub 
       File dir = new File("/sdcard/sdcard"); 
       int index=0; 
       String[] children = dir.list(); 
       for(int i=0;i<children.length;i++) 
       { 
        String filename=children[i]; 
        playAudio(filename); 
       } 
      } 

      private void playAudio(String filename) { 
       // TODO Auto-generated method stub 
       mPlayer = new MediaPlayer(); 
        try { 
         mPlayer.setDataSource(filename); 
        } catch (IllegalArgumentException e1) { 
         // TODO Auto-generated catch block 
         e1.printStackTrace(); 
        } catch (IllegalStateException e1) { 
         // TODO Auto-generated catch block 
         e1.printStackTrace(); 
        } catch (IOException e1) { 
         // TODO Auto-generated catch block 
         e1.printStackTrace(); 
        } 
        try { 
         mPlayer.prepare(); 
        } catch (IllegalStateException e1) { 
         // TODO Auto-generated catch block 
         e1.printStackTrace(); 
        } catch (IOException e1) { 
         // TODO Auto-generated catch block 
         e1.printStackTrace(); 
        } 
        mPlayer.start(); 
        mSeekBar.setMax(mPlayer.getDuration()); 
        new Thread(new Runnable(){ 

@Override 
public void run() 
{ 
// TODO Auto-generated method stub 
while(mPlayer!=null && mPlayer.getCurrentPosition() <mPlayer.getDuration()) 
    { 
Log.d("Indide Run Method",Integer.toString(mPlayer.getCurrentPosition())); 
    try 
    { 
      Thread.sleep(100); 
    } 
catch (InterruptedException e) 
    { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } 
           mSeekBar.setProgress(mPlayer.getCurrentPosition()); 
          } 


         } 

        } 
        ).start(); 
        mSeekBar.setProgress(mPlayer.getCurrentPosition()); 

     pauseRecord.setVisibility(View.INVISIBLE); 


      } 

     }); 

如何解決問題？

05-24 18:34:19.455: DEBUG/MediaPlayer(19961):  at dalvik.system.NativeStart.main(Native Method) 
05-24 18:34:19.465: WARN/dalvikvm(19961): threadid=3: thread exiting with uncaught exception (group=0x2aadda10) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961): Uncaught handler: thread main exiting due to uncaught exception 
**05-24 18:34:19.465: ERROR/AndroidRuntime(19961): java.lang.NullPointerException 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.fsp.audio.resume.AudioResume.playChild(AudioResume.java:402) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.fsp.audio.resume.AudioResume.playlist(AudioResume.java:393) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.fsp.audio.resume.AudioResume.access$0(AudioResume.java:391) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.fsp.audio.resume.AudioResume$1.onClick(AudioResume.java:132) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.View.performClick(View.java:2347) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.View.onTouchEvent(View.java:4185) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.widget.TextView.onTouchEvent(TextView.java:6521) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.View.dispatchTouchEvent(View.java:3717)** 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:882) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1712) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1202) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.app.Activity.dispatchTouchEvent(Activity.java:1987) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1696) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1659) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.os.Handler.dispatchMessage(Handler.java:99) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.os.Looper.loop(Looper.java:123) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at android.app.ActivityThread.main(ActivityThread.java:4203) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at java.lang.reflect.Method.invoke(Method.java:521) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557) 
05-24 18:34:19.465: ERROR/AndroidRuntime(19961):  at dalvik.system.NativeStart.main(Native Method) 
05-24 18:34:21.435: ERROR/dun_service(19989): Unable to open external port /dev/ttyHSUSB0 : No such device 
05-24 18:34:26.465: ERROR/dun_service(19991): Unable to open external port /dev/ttyHSUSB0 : No such device 
05-24 18:34:31.495: ERROR/dun_service(19993): Unable to open external port /dev/ttyHSUSB0 : No such device 
05-24 18:34:36.525: ERROR/dun_service(19995): Unable to open external port /dev/ttyHSUSB0 : No such device 

Answer 1

爲了其他的你可以使用MediaPlayer.OnCompletionListener後播放一個文件：

final MediaPlayer mp1 = new MediaPlayer(); 
mp1.setAudioStreamType(AudioManager.STREAM_MUSIC); 
mp1.setDataSource(file1); 
mp1.prepare(); 
mp1.start(); 

mp1.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { 
    @Override 
    public void onCompletion(MediaPlayer mp) { 
     mp1.release(); 
     //file 1 has played, now play the second 
    } 
});