surfaceview+mediaplayer

public class VideosurfaceView extends SurfaceView implements SurfaceHolder.Callback, MediaPlayer.OnPreparedListener {
    private SurfaceHolder holder;
    private MediaPlayer mediaPlayer;

    public VideosurfaceView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
       holder= getHolder();
        holder.addCallback(this);
        holder.setKeepScreenOn(true);
    }
    //设置路径并播放
    public void playVideo(String patn){
        if (mediaPlayer==null){
            mediaPlayer=new MediaPlayer();
            mediaPlayer.setOnPreparedListener(this);
        }

        try {
            //重置mediaplayer
             mediaPlayer.reset();
            //设置播放路径
            //设置画面播放源
            mediaPlayer.setDisplay(holder);
            mediaPlayer.setDataSource(patn);

            //准备播放
            mediaPlayer.prepareAsync();
            //开始播放
            mediaPlayer.start();
            mediaPlayer.isPlaying();

        } catch (IOException e) {
            e.printStackTrace();
        }

    }
//    public  void kuaijin(){
//        int currentPosition = mediaPlayer.getCurrentPosition();
//        currentPosition+=2000;
//        mediaPlayer.seekTo(currentPosition);
//
//    }
    //停止播放
    public void stop(){
        if (mediaPlayer!=null){
            if (mediaPlayer.isPlaying()){
                mediaPlayer.pause();
            }else {
                mediaPlayer.start();
            }
        }
    }
    //重新播放
    public void replay(){
        mediaPlayer.reset();
    }
    @Override
    //当surface第一次创建的时候
    public void surfaceCreated(SurfaceHolder holder) {

    }

    @Override
    //当surface要改变的时候
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    @Override
    //当surface要销毁的时候
    public void surfaceDestroyed(SurfaceHolder holder) {
        if (mediaPlayer!=null){
            mediaPlayer.release();//释放资源
            mediaPlayer=null;
        }

    }

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

//在主函数里只需调用即可

    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.play_btn:
                patn = Environment.getExternalStorageDirectory().getPath() + "/1508553914748.mp4";
//                获取外部存储目录
//                设置显示
                video_view.setVisibility(View.VISIBLE);
//                设置路径
                video_view.playVideo(patn);
                break;
            case R.id.pause_btn:
                video_view.stop();
                //video_view.kuaijin();
                break;
            case R.id.replay_btn:
                video_view.playVideo(patn);
                break;
        }
    }