class _MyAppState extends State<MyApp> {
    RtmpManager _manager;

    @override
    void initState(){
        super.initState();
        // e.g 1
        //_manager = RtmpManager();
    }    

    @override
    Widget build(BuildContext context) {
        return RtmpView(
            //e.g 2
            manager:_manager ??= RtmpManager()
      );
  
}

无需设置
        ndk{
            abiFilters "armeabi-v7a"
        }

可以在VSCode中直接运行调试 *hot reload 时会黑屏*