Flutter calling child class function from parent class

Question

Code:

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(         


        

Answer 1

Thanks to Günter Zöchbauer for pointing me in right direction. I am using GlobalKey to get the things done. However use GlobalKey with care

GlobalKey<_HomePageState> globalKey = GlobalKey();

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          leading: IconButton(
            icon: Icon(Icons.help),
            onPressed: () {
             globalKey.currentState.methodA();
            },
          ),
        ),
        body: HomePage(key: globalKey),
      ),
    );
  }
}
class HomePage extends StatefulWidget {
  HomePage({Key key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Container();
  }

  void methodA() {}
}