mediaplayer与surfaceView,无法播放问题

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

1 private class SurfaceViewLis implementsSurfaceHolder.Callback {  
2           
3 @Override  
4         public void surfaceChanged(SurfaceHolder holder, int format, intwidth,  
5                 intheight) {  
6   
7 }  
8   
9 @Override  
10         public voidsurfaceCreated(SurfaceHolder holder) {  
11             mPlayer = MediaPlayer.create(AnimationGuideActivity.this, R.raw.guideanimation);
12 mPlayer.setDisplay(holder);
13             mPlayer.setOnCompletionListener(newMediaPlayer.OnCompletionListener() {
14                 
15 @Override
16                 public voidonCompletion(MediaPlayer arg0) {
17                     //TODO Auto-generated method stub
18                     Intent intent = new Intent(AnimationGuideActivity.this, IrisActivity.class);
19 finish();
20 startActivity(intent);
21 }
22 });
23 
24             try{
25                 mPlayer.setOnPreparedListener(newOnPreparedListener() {
26                     
27 @Override
28                     public voidonPrepared(MediaPlayer arg0) {
29 mPlayer.start();
30                         
31 }
32 });
33 mPlayer.prepareAsync();
34             } catch(IllegalStateException  e) {
35                 //TODO Auto-generated catch block
36 e.printStackTrace();
37 }
38   
39 }  
40   
41 @Override  
42         public voidsurfaceDestroyed(SurfaceHolder holder) {  
43   
44 }  
45   
46     }