checkInternetConnection.dart

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: Connectivity().onConnectivityChanged,
      builder: (context, AsyncSnapshot<ConnectivityResult> snapshot) {
        return snapshot.data == ConnectivityResult.mobile ||
                snapshot.data == ConnectivityResult.wifi
            ? MaterialApp(
                title: 'Flutter Stateless Demo',
                theme: ThemeData(
                  primarySwatch: Colors.blue,
                ),
                home: const MyHomePage(title: 'Online'),
                debugShowCheckedModeBanner: false,
              )
            : MaterialApp(
                title: 'Flutter Stateless Demo',
                theme: ThemeData(
                  primarySwatch: Colors.blue,
                ),
                home: const MyHomePage(title: 'Offline'),
                debugShowCheckedModeBanner: false,
              ); // another material app for showing user he is offline
      },
    );
  }
}