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:
public abstract void surfaceChanged(SurfaceHolder holder, int format, int width, int height) public abstract voidsurfaceCreated(SurfaceHolder holder) public abstract voidsurfaceDestroyed(SurfaceHolder holder)
代码:
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mediaPlayer = new MediaPlayer(); 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(new SurfaceCallback()); } private final class SurfaceCallback implements Callback{ public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } public void surfaceCreated(SurfaceHolder holder) { if(position>0 && path!=null){ play(position); position = 0; } } public void surfaceDestroyed(SurfaceHolder holder) { if(mediaPlayer.isPlaying()){ position = mediaPlayer.getCurrentPosition(); mediaPlayer.stop(); } } }
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