Android解决Mediaplayer+SurfaceView播放视频中的若干BUG

        项目的功能很简单，单纯的播放视频，没有进度条，暂停键等，只有一个关闭按钮，当播放视频时切换到后台暂停播放，恢复到前台后接着原来的进度播放。

        1.用MediaPlayer播放视频，调用MediaPlayer.start()，surfaceHolder还没初始化好，debug时指示错误的地方在

        MediaPlayer.setDisplay(surfaceHolder)。

        解决方法是把setDisplay（）和start（）放在surfaceCreated（SurfaceHolder holder）中，注意一定要setDisplay在start之前。

        2.程序切换到后台再恢复播放，有声音没画面。

        原因方式是当Activity进入onPause状态之后，SurfaceView会被销毁，进而回调surfaceDestroyed（）方法，当程序从后台恢复到前台是，SurfaceView并没有重新创建，所以就出现只有声音没有画面的情况。

        针对以上两种情况，完整的视频播放代码如下所示：

public class VideoPlayActivity extends BaseActivity implements SurfaceHolder.Callback {

    private MediaPlayer mMediaPlayer = null;
    private SurfaceHolder mSurfaceHolder;
    @BindView(R.id.video_play)
    SurfaceView mVideoPlay;
    @BindView(R.id.video_close)
    ImageView mVideoClose;
    private String videoPath = "";
    private int currentPosition = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video_play);
        ButterKnife.bind(this);

        Intent intent = getIntent();
        videoPath = intent.getStringExtra("videoPath");

        mSurfaceHolder = mVideoPlay.getHolder();
        mSurfaceHolder.addCallback(this);
        mMediaPlayer = new MediaPlayer();
    }

    @OnClick(R.id.video_close)
    public void onViewClicked() {
        if(mMediaPlayer != null){
            finish();
            mMediaPlayer.reset();
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(mMediaPlayer != null){
            finish();
            mMediaPlayer.reset();
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mMediaPlayer.setDisplay(mSurfaceHolder);    //设置显示视频显示在SurfaceView上
        play(currentPosition);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        if(mMediaPlayer != null && mMediaPlayer.isPlaying()){
            currentPosition = mMediaPlayer.getCurrentPosition();
            mMediaPlayer.stop();
        }
    }

    private void play(int msec){
        try {
            mMediaPlayer.reset();
            mMediaPlayer.setDataSource(videoPath);
            mMediaPlayer.prepare();
            mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mMediaPlayer.start();
                    mMediaPlayer.seekTo(msec);
                }
            });

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

}
           

备注：

播放视频时，SurfaceView区域视觉上会黑屏一会儿，可以用

SurfaceView的setZOrderOnTop(true);解决      

悬浮最上层后可能会遮挡其他的View，可以用

SurfaceView的setZOrderMediaOverlay(true)；解决