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) {  
  
        }  
  
    }