Is there any question about the route code in my flutter code? - flutter

Question

I want to make a new route in the flutter , but I failed,
my VS Code give me this:
The following assertion was thrown while handling a gesture:
I/flutter (32582): Navigator operation requested with a context that does not include a Navigator.
I/flutter (32582): The context used to push or pop routes from the Navigator must be that of a widget that is a
I/flutter (32582): descendant of a Navigator widget
import 'package:flutter/material.dart';
void main()=>runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Lake',
routes: {
'sss': (context)=>new NewRoute()
},
home: new Scaffold(
appBar: AppBar(
title: Text('Lake'),
),
body: Text('BBB'),
floatingActionButton: new FloatingActionButton(
child: Icon(Icons.import_contacts),
onPressed: (){
Navigator.pushNamed(context, 'sss');
},
),
),
);
}
}
class NewRoute extends StatelessWidget{
#override
Widget build(BuildContext context){
return new Scaffold(
appBar: AppBar(
title: Text('BBB'),
),
body: Center(
child: Text('wahaha'),
),
);
}
}

Answer 1

Plea use this code
home: Builder(
builder: (context) => Scaffold(
appBar: AppBar(
title: Text('Lake'),
),
body: Text('BBB'),
floatingActionButton: new FloatingActionButton(
child: Icon(Icons.import_contacts),
onPressed: (){
Navigator.pushNamed(context, 'sss');
},
),
),)
Builder let you build a new context from direct parent like described there https://docs.flutter.io/flutter/widgets/Builder-class.html

Answer 2

You are using routes incorrectly. when you use home in MaterialApp it will bypass the Routes. insted of that you can use initialRoute to define Home Screen
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Lake',
routes: {
'sss': (context) => const NewRoute(),
'home': (context) => const HomeScreen(),
},
initialRoute: 'home',
);
}
}
class HomeScreen extends StatelessWidget {
const HomeScreen({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Lake'),
),
body: const Text('BBB'),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.import_contacts),
onPressed: () {
Navigator.pushNamed(context, 'sss');
},
),
);
}
}
class NewRoute extends StatelessWidget {
const NewRoute({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('BBB'),
),
body: const Center(
child: Text('wahaha'),
),
);
}
}
also avoid using new keyword.
you can also try with onGenarated Routes in flutter.
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