surface初步学习，播放在线视频和本地视频

public class MainActivity extends ActionBarActivity {

    private SurfaceHolder holder;
    private SurfaceView sf;
    private MediaPlayer mediaplayer;
    private  String path;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        sf=(SurfaceView) findViewById(R.id.sf); 
        holder= sf.getHolder();　　//　　这里是设置surfaceview不维护自己的缓冲区而是等待屏幕的渲染引擎将视频推送到用户面前
        
        
    }
    
    
    
    public void start(View v)
    {
        mediaplayer =new MediaPlayer();
        mediaplayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
//        path="data/data/musics/oppo.3gp";
        path="http://192.168.61.173:8080/mymusics/oppo.3gp";
        try {
            
            mediaplayer.setDataSource(path);
             
            mediaplayer.setDisplay(holder);  //设置视频在哪里播放，holder即surfaceview空间里。

//         mediaplayer.prepareAsync();
//         mediaplayer.setOnPreparedListener(new MypreparedListener());
            
            mediaplayer.prepare();
            mediaplayer.start();
        } catch (Exception e) {
            e.printStackTrace();
        } 
    }
    class MypreparedListener implements OnPreparedListener
    {

        @Override
        public void onPrepared(MediaPlayer mp) {
            mediaplayer.start();
        }
        
    }
 
}