main.dart

## Run this command to add this package as a library:
## --> flutter pub add shared_preferences

  
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final SharedPreferences prefs = await SharedPreferences.getInstance();
  var isLoggedIn = (prefs.getBool('isLoggedIn') == null)
      ? false
      : prefs.getBool('isLoggedIn');
  runApp(MaterialApp(
    debugShowCheckedModeBanner: false,
    home: isLoggedIn ? DashboardPage() : LoginPage(),
  ));
}

class DashboardPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.blue,
    );
  }
}

class LoginPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.amber,
    );
  }
}