Flutter uses FittedBox to perform full-screen adaptation of VideoPlayer without stretching

In order to achieve full-screen video playback without leaving black borders or stretching:

At the beginning, I tried to use the following code for adaptation, but an error was reported directly. VideoPlayer belongs to Texture and cannot be directly wrapped under FittedBox. It is necessary to nest a layer of controls with clear width and height for VideoPlayer.

FittedBox(
                      fit: BoxFit.cover,
                        child: VideoPlayer(controller: _playerControler.getMainController()),
                      ),

Finally, I refer to: Flutter videoplayer adaptation_kgdtl's blog-CSDN blog

Center(
      child: SizedBox.expand(
             child: FittedBox(
                fit: BoxFit.cover,
                child: SizedBox(
                    height: 16,
                    width: 9,
                    child: VideoPlayer(player.controller)),
              )
));