视频播放：MediaPlayer+SurfaceView(双缓冲)

/**
     * 播放视频的方法
     */
    private void play() {
        mp_video = new MediaPlayer();
        AssetFileDescriptor afd = getResources().openRawResourceFd(R.raw.por);
        try {
            // 设置视频源
            mp_video.setDataSource(afd.getFileDescriptor(),
                    afd.getStartOffset(), afd.getLength());
            mp_video.setLooping(true);//设置循环
            mp_video.setDisplay(sv_video.getHolder());
            mp_video.prepareAsync();//异步
            mp_video.setOnPreparedListener(this);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }