mediaplayer与surfaceView,无法播放问题

　mediaplayer需要在surfaceView创建之后才能创建，不然会导致错误。

 surfaceholder = msurface.getHolder();
         surfaceholder.setKeepScreenOn(true);
         surfaceholder.addCallback(new SurfaceViewLis());

 private class SurfaceViewLis implements SurfaceHolder.Callback {  

         @Override
         public void surfaceChanged(SurfaceHolder holder, int format, int width,
                 int height) {  

         }  

         @Override
         public void surfaceCreated(SurfaceHolder holder) {
             mPlayer = MediaPlayer.create(AnimationGuideActivity.this, R.raw.guideanimation);
             mPlayer.setDisplay(holder);
             mPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

                 @Override
                 public void onCompletion(MediaPlayer arg0) {
                     // TODO Auto-generated method stub
                     Intent intent = new Intent(AnimationGuideActivity.this, IrisActivity.class);
                     finish();
                     startActivity(intent);
                 }
             });

             try {
                 mPlayer.setOnPreparedListener(new OnPreparedListener() {

                     @Override
                     public void onPrepared(MediaPlayer arg0) {
                         mPlayer.start();

                     }
                 });
                 mPlayer.prepareAsync();
             } catch (IllegalStateException  e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }

         }  

         @Override
         public void surfaceDestroyed(SurfaceHolder holder) {  

         }  

     }