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

The above answer did not work for me, instead i just replaced the global key and it worked very well:

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


class HomePage extends StatefulWidget {
//Add this key like this:
static final GlobalKey<_HomePageState> globalKey = GlobalKey();
super(key: globalKey);

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

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

 void methodA() {}
}

Hope everything is working:)