Video三种播放方式

1、使用其自带的播放器。指定Action为ACTION_VIEW,Data为Uri，Type为其MIME类型。

2、使用VideoView来播放。在布局文件中使用VideoView结合MediaController来实现对其控制。

3、使用MediaPlayer类和SurfaceView来实现。这种方式最灵活，也最复杂。

1、调用其自带的播放器：

Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v");//调用系统自带的播放器
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "video/mp4");
startActivity(intent);

2、使用VideoView来实现：

Uri uri = Uri.parse(Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v");
VideoView videoView = (VideoView)this.findViewById(R.id.video_view);
videoView.setMediaController(new MediaController(this));
videoView.setVideoURI(uri);
//videoView.start();
videoView.requestFocus();

3、使用MediaPlayer：

/**
 * 该实例中使用MediaPlayer完成播放，同时界面使用SurfaceView来实现
 * 
 * 这里我们实现MediaPlayer中很多状态变化时的监听器
 * 
 * 使用Mediaplayer时，也可以使用MediaController类，但是需要实现MediaController.mediaController接口
 * 实现一些控制方法。
 * 
 * 然后，设置controller.setMediaPlayer(),setAnchorView(),setEnabled(),show()就可以了，这里不再实现
 * @author Administrator
 *
 */
public class VideoSurfaceDemo extends Activity implements OnCompletionListener,OnErrorListener,OnInfoListener,
	OnPreparedListener, OnSeekCompleteListener,OnVideoSizeChangedListener,SurfaceHolder.Callback{
	private Display currDisplay;
	private SurfaceView surfaceView;
	private SurfaceHolder holder;
	private MediaPlayer player;
	private int vWidth,vHeight;
	//private boolean readyToPlay = false;


	public void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		this.setContentView(R.layout.video_surface);


		surfaceView = (SurfaceView)this.findViewById(R.id.video_surface);
		//给SurfaceView添加CallBack监听
		holder = surfaceView.getHolder();
		holder.addCallback(this);
		//为了可以播放视频或者使用Camera预览，我们需要指定其Buffer类型
		holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

		//下面开始实例化MediaPlayer对象
		player = new MediaPlayer();
		player.setOnCompletionListener(this);
		player.setOnErrorListener(this);
		player.setOnInfoListener(this);
		player.setOnPreparedListener(this);
		player.setOnSeekCompleteListener(this);
		player.setOnVideoSizeChangedListener(this);
		Log.v("Begin:::", "surfaceDestroyed called");
		//然后指定需要播放文件的路径，初始化MediaPlayer
		String dataPath = Environment.getExternalStorageDirectory().getPath()+"/Test_Movie.m4v";
		try {
			player.setDataSource(dataPath);
			Log.v("Next:::", "surfaceDestroyed called");
		} catch (IllegalArgumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalStateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		//然后，我们取得当前Display对象
		currDisplay = this.getWindowManager().getDefaultDisplay();
	}

	@Override
	public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
		// 当Surface尺寸等参数改变时触发
		Log.v("Surface Change:::", "surfaceChanged called");
	}
	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		// 当SurfaceView中的Surface被创建的时候被调用
		//在这里我们指定MediaPlayer在当前的Surface中进行播放
		player.setDisplay(holder);
		//在指定了MediaPlayer播放的容器后，我们就可以使用prepare或者prepareAsync来准备播放了
		player.prepareAsync();

	}
	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {

		Log.v("Surface Destory:::", "surfaceDestroyed called");
	}
	@Override
	public void onVideoSizeChanged(MediaPlayer arg0, int arg1, int arg2) {
		// 当video大小改变时触发
		//这个方法在设置player的source后至少触发一次
		Log.v("Video Size Change", "onVideoSizeChanged called");

	}
	@Override
	public void onSeekComplete(MediaPlayer arg0) {
		// seek操作完成时触发
		Log.v("Seek Completion", "onSeekComplete called");

	}
	@Override
	public void onPrepared(MediaPlayer player) {
		// 当prepare完成后，该方法触发，在这里我们播放视频

		//首先取得video的宽和高
		vWidth = player.getVideoWidth();
		vHeight = player.getVideoHeight();

		if(vWidth > currDisplay.getWidth() || vHeight > currDisplay.getHeight()){
			//如果video的宽或者高超出了当前屏幕的大小，则要进行缩放
			float wRatio = (float)vWidth/(float)currDisplay.getWidth();
			float hRatio = (float)vHeight/(float)currDisplay.getHeight();

			//选择大的一个进行缩放
			float ratio = Math.max(wRatio, hRatio);

			vWidth = (int)Math.ceil((float)vWidth/ratio);
			vHeight = (int)Math.ceil((float)vHeight/ratio);

			//设置surfaceView的布局参数
			surfaceView.setLayoutParams(new LinearLayout.LayoutParams(vWidth, vHeight));

			//然后开始播放视频

			player.start();
		}
	}
	@Override
	public boolean onInfo(MediaPlayer player, int whatInfo, int extra) {
		// 当一些特定信息出现或者警告时触发
		switch(whatInfo){
		case MediaPlayer.MEDIA_INFO_BAD_INTERLEAVING:
			break;
		case MediaPlayer.MEDIA_INFO_METADATA_UPDATE:

			break;
		case MediaPlayer.MEDIA_INFO_VIDEO_TRACK_LAGGING:

			break;
		case MediaPlayer.MEDIA_INFO_NOT_SEEKABLE:

			break;
		}
		return false;
	}
	@Override
	public boolean onError(MediaPlayer player, int whatError, int extra) {
		Log.v("Play Error:::", "onError called");
		switch (whatError) {
		case MediaPlayer.MEDIA_ERROR_SERVER_DIED:
			Log.v("Play Error:::", "MEDIA_ERROR_SERVER_DIED");
			break;
		case MediaPlayer.MEDIA_ERROR_UNKNOWN:
			Log.v("Play Error:::", "MEDIA_ERROR_UNKNOWN");
			break;
		default:
			break;
		}
		return false;
	}
	@Override
	public void onCompletion(MediaPlayer player) {
		// 当MediaPlayer播放完成后触发
		Log.v("Play Over:::", "onComletion called");
		this.finish();
	}
}