视频横竖屏切换后的适配问题（使用的是flutter_screenutil）

[yujieliang]

问题效果图：
全屏前：

全屏后再次恢复成竖屏：

我的适配是用的框架flutter_screenutil，视频的container宽高设置为
width: ScreenUtil.screenWidthDp,
height: ScreenUtil.screenWidthDp0.5625, （16：9）
进入全屏后，宽度值即为屏幕的高度，退出全屏ScreenUtil.screenWidthDp获取到的宽度依然为屏幕的高度，所以导致ScreenUtil.screenWidthDp0.5625比实际的大
代码：

Widget get videoSection {
    return Container(
        width: ScreenUtil.screenWidthDp,
        height: ScreenUtil.screenWidthDp*0.5625,
        color: Colors.white,
        alignment: Alignment.center,
        child: _video==''?
        Column(
          mainAxisAlignment: MainAxisAlignment.center,
          mainAxisSize: MainAxisSize.max,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            Text('添加顶部宣传视频',
              style: TextStyle(
                color: Colors.grey,
                fontSize: ScreenUtil().setSp(29.0),
              ),
            ),
            Container(
              margin: EdgeInsets.fromLTRB(0, 15, 0, 0),
              padding: EdgeInsets.fromLTRB(15, 5, 15, 5),
              decoration: BoxDecoration(
                  border: new Border.all(color: Colors.red[500], width: 1), // 边色与边宽度
                  borderRadius: BorderRadius.all(Radius.circular(5))
              ),
              child: Text('添加视频',
                style: TextStyle(
                  color: Colors.red,
                  fontSize: ScreenUtil().setSp(28.0),
                ),
              ),
            )
          ],
        ): Container(
          child: FijkView(
            player: player,
          ),
        )
    );
  }

解决办法：
宽度的获取改成通过MediaQuery.of(context).size.width去获取，这样获取的宽度不会随着全屏而变化
代码：

Widget get videoSection {
    return Container(
        width: MediaQuery.of(context).size.width,
        height: MediaQuery.of(context).size.width*0.5625,
        color: Colors.white,
        alignment: Alignment.center,
        child: _video==''?
        Column(
          mainAxisAlignment: MainAxisAlignment.center,
          mainAxisSize: MainAxisSize.max,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            Text('添加顶部宣传视频',
              style: TextStyle(
                color: Colors.grey,
                fontSize: 15,
              ),
            ),
            Container(
              margin: EdgeInsets.fromLTRB(0, 15, 0, 0),
              padding: EdgeInsets.fromLTRB(15, 5, 15, 5),
              decoration: BoxDecoration(
                  border: new Border.all(color: Colors.red[500], width: 1), // 边色与边宽度
                  borderRadius: BorderRadius.all(Radius.circular(5))
              ),
              child: Text('添加视频',
                style: TextStyle(
                  color: Colors.red,
                  fontSize: 15,
                ),
              ),
            )
          ],
        ): Container(
          child: FijkView(
            player: player,
            fit: FijkFit.ar16_9,
          ),
        )
    );
  }

[befovy]

@all-contributors please add @yujieliang for question

[allcontributors]

@befovy

I've put up a pull request to add @yujieliang! 🎉