生命周期：

注：播放完毕之后进入PlaybackCompleted状态。


播放视频：

public void setDisplay (SurfaceHolder sh)

Since: API Level 1

设置用于视频显示的SurfaceHolder。不论是surface holder或是surface，如果视频库需要，就必须设置。当播放一个视频而没有调用这个函数或是没有调用setSurface(Surface)，那么只会播放音频了。一个空的surface holder或空的surface将会导致仅仅播放音频。

android.view.Surface：Handle onto a raw buffer that is being managed by the screen compositor.

android.view.SurfaceView：Provides a dedicated drawing surface embedded inside of a view hierarchy. You can control the format of this surface and, if you like, its size; the SurfaceView takes care of placing the surface at the correct location on the screen.

SurfaceHolder是控制surface的一个抽象接口，你可以通过SurfaceHolder来控制surface的尺寸和格式，或者修改surface的像素，监视surface的变化等等，SurfaceHolder是SurfaceView的典型接口。

SurfaceView和Surface的关系：Surface是管理显示内容的数据（implementsParcelable），包括存储于数据的交换。而SurfaceView就是把这些数据显示出来到屏幕上面。

SurfaceHolder.Callback是监听surface改变的一个接口。它的方法有：

publicabstractvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight)publicabstractvoidsurfaceCreated(SurfaceHolderholder)publicabstractvoidsurfaceDestroyed(SurfaceHolderholder)



代码：

publicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main);mediaPlayer=newMediaPlayer();nameText=(EditText)this.findViewById(R.id.filename);surfaceView=(SurfaceView)this.findViewById(R.id.surfaceView);//把输送给surfaceView的视频画面，直接显示到屏幕上,不要维持它自身的缓冲区surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);surfaceView.getHolder().setFixedSize(176,144);surfaceView.getHolder().setKeepScreenOn(true);surfaceView.getHolder().addCallback(newSurfaceCallback());}privatefinalclassSurfaceCallbackimplementsCallback{publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight){}publicvoidsurfaceCreated(SurfaceHolderholder){if(position>0&&path!=null){play(position);position=0;}}publicvoidsurfaceDestroyed(SurfaceHolderholder){if(mediaPlayer.isPlaying()){position=mediaPlayer.getCurrentPosition();mediaPlayer.stop();}}}