• The cause of
• Error reason
• The solution

The cause of

Error when Navigator jumps:

 Navigator.push(context,  MaterialPageRoute(
                                        builder: (context) => MainPage()
                                    ) );
Copy the code

Error reason

The solution

Jump to the StatefulWidget at runtime using the StatelessWidget;

void main(a) {
  runApp(FlareDemo());
}

class FlareDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    returnMaterialApp( home: FlareSignInDemo() , ); }}class FlareSignInDemo extends StatefulWidget {
  @override
  _FlareSignInDemoState createState(a) => _FlareSignInDemoState();
}

class _FlareSignInDemoState extends State<FlareSignInDemo> {
  FlareSignInController _signInController;

  @override
  void initState(a) {
    _signInController = FlareSignInController();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    returnMaterialApp( home: Scaffold( body: Theme( data: Theme.of(context).copyWith( primaryColor: Colors.black54, ), child: RaisedButton(onPressed: () { Navigator.push(context, MaterialPageRoute( builder: (context) => MainPage() ) ); },),),),); }}Copy the code