FlutterBlocRoutes.doc

//anonymous route sharing a existing instance
 onPressed: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (_) => BlocProvider.value(
                        value: BlocProvider.of<CounterCubit>(context),
                        child: SecondScreen(
                          title: "Second Page",
                          color: Colors.redAccent,
                        ),
                      ),
                    ),
                  );
                },
                
//anonymous route sharing a new instance
 onPressed: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (_) => BlocProvider.value(
                        value: CounterCubit(),
                        child: SecondScreen(
                          title: "Second Page",
                          color: Colors.redAccent,
                        ),
                      ),
                    ),
                  );
                },
                
//Named Route sharing a existing instance
class MyApp extends StatefulWidget {
  // This widget is the root of your application.
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final CounterCubit _counterCubit = CounterCubit();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter bloc demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      routes: {
        '/': (context) => BlocProvider.value(
              value: _counterCubit,
              child: HomeScreen(
                title: "Home Page",
                color: Colors.blueAccent,
              ),
            ),
        '/second': (context) => BlocProvider.value(
              value: _counterCubit,
              child: SecondScreen(
                title: "Second Page",
                color: Colors.redAccent,
              ),
            ),
        '/third': (context) => BlocProvider.value(
              value: _counterCubit,
              child: ThirdScreen(
                title: "Second Page",
                color: Colors.greenAccent,
              ),
            ),
      },
    );
  }

  @override
  void dispose() {
    _counterCubit.close();
    super.dispose();
  }
}

//call named route by
onPressed: () {
                  Navigator.of(context).pushNamed('/second');
                },
                
                
  // Generated Route
  import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_bloc_concept2/logic/cubit/counter_cubit.dart';
import 'package:flutter_bloc_concept2/presentation/screens/home_screen.dart';
import 'package:flutter_bloc_concept2/presentation/screens/second_screen.dart';
import 'package:flutter_bloc_concept2/presentation/screens/third_screen.dart';

class AppRouter {
  final CounterCubit _counterCubit = CounterCubit();
  Route? onGenerateRoute(RouteSettings routeSettings) {
    switch (routeSettings.name) {
      case '/':
        return MaterialPageRoute(
          builder: (_) => BlocProvider.value(
            value: _counterCubit,
            child: HomeScreen(
              title: "Home Page",
              color: Colors.blueAccent,
            ),
          ),
        );
      case '/second':
        return MaterialPageRoute(
          builder: (_) => BlocProvider.value(
            value: _counterCubit,
            child: SecondScreen(
              title: "Second Page",
              color: Colors.redAccent,
            ),
          ),
        );
      case '/third':
        return MaterialPageRoute(
          builder: (_) => BlocProvider.value(
            value: _counterCubit,
            child: ThirdScreen(
              title: "Third Page",
              color: Colors.greenAccent,
            ),
          ),
        );
      default:
        return null;
    }
  }

  void dispose() {
    _counterCubit.close();
  }
}


//call Generated Route 
void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final AppRouter _appRouter = AppRouter();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter bloc demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      onGenerateRoute: _appRouter.onGenerateRoute,
    );
  }

  @override
  void dispose() {
    _appRouter.dispose();
    super.dispose();
  }
}

//call genereted pressed 
onPressed: () {
                  Navigator.of(context).pushNamed('/second');
                },