问颤动相机预览不随手机方向旋转

EN

class _VideoPlayerWidgetState extends State<VideoPlayerWidget> {
  VideoPlayerController _videoPlayerController;
  ChewieController _chewieController;

  @override
  void initState() {
    super.initState();
    initializePlayer();
  }

  Future<void> initializePlayer() async {
// widget.url put url video file path
    _videoPlayerController =
        _videoPlayerController = VideoPlayerController.network(widget.url);
    await Future.wait([_videoPlayerController.initialize()]);
    _chewieController = ChewieController(
      videoPlayerController: _videoPlayerController,
      autoPlay: true,
      looping: true,
    );
  }

  bool useSensor = true;
  bool portrait;

 
  @override
  Widget build(BuildContext context) {
    return NativeDeviceOrientationReader(
      builder: (context) {
        NativeDeviceOrientation orientation =
            NativeDeviceOrientationReader.orientation(context);
        portrait = orientation == NativeDeviceOrientation.portraitUp;
        if(orientation == NativeDeviceOrientation.landscapeLeft){
          SystemChrome.setPreferredOrientations([
            !portrait
                ? DeviceOrientation.landscapeLeft
                : DeviceOrientation.portraitUp,
            !portrait
                ? DeviceOrientation.landscapeLeft
                : DeviceOrientation.portraitDown,
          ]);

        }else{
          SystemChrome.setPreferredOrientations([
            !portrait
                ? DeviceOrientation.landscapeRight
                : DeviceOrientation.portraitUp,
            !portrait
                ? DeviceOrientation.landscapeRight
                : DeviceOrientation.portraitDown,
          ]);
        }
        return _chewieController != null &&
                _chewieController.videoPlayerController.value.isInitialized
            ? Chewie(
                controller: _chewieController,
              )
            : Center(child: CircularProgressIndicator());
      },
      useSensor: useSensor,
    );
  }

  @override
  void dispose() {
    _videoPlayerController.dispose();
    _chewieController.dispose();
    SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
    super.dispose();
  }
}