我在VideoView上面放了一个百度的MapView，如果视频不播放的话，就是不调用VideoView的start方法，MapView能正常显示，一旦调用start方法，MapView就会变黑，只显示比例尺和缩放按钮。
布局文件如下:

android:layout_width="match_parent"
android:layout_height="match_parent">



    
    
    

    
    

public void init() {


        back_image = (ImageView) findViewById(R.id.back_image);

        mController = new MediaController(this);
        mVideo = (VideoView) findViewById(R.id.video);

        File video = new File("/storage/sdcard1/hd.mp4");
        if(video.exists())
        {
            mVideo.setVideoPath(video.getAbsolutePath());  // ①
            // 设置videoView与mController建立关联
            mVideo.setMediaController(mController);  // ②
            // 设置mController与videoView建立关联
            mController.setMediaPlayer(mVideo);  // ③
            // 让VideoView获取焦点
          //  mVideo.requestFocus();
            mVideo.setVisibility(View.INVISIBLE);
        }else Toast.makeText(MainActivity.this,"The Video is not exist.",Toast.LENGTH_SHORT).show();

        mMapView = (MapView) findViewById(R.id.map);
        mMapView.setVisibility(View.INVISIBLE);

        navController = (NavController) findViewById(R.id.navController);
        navController.setVisibility(View.INVISIBLE);

        navController.setOnNavAndSpeedListener(new NavController.OnNavAndSpeedListener() {
            @Override
            public void onNavAndSpeed(float nav, float speed) {
                Toast.makeText(MainActivity.this, "nav is " + nav + ",speed is " + speed, Toast.LENGTH_SHORT).show();
            }
        });
    }

    private void videoStart()
    {
        mVideo.setVisibility(View.VISIBLE);
        mMapView.setVisibility(View.VISIBLE);
        navController.setVisibility(View.VISIBLE);

       // mVideo.start();
    }