wetterApp/lib/main.dart

import 'package:flutter/material.dart';
import 'package:wetter/components/main_menu.dart';
import 'package:wetter/screens/main_weather_view.dart';
import 'package:wetter/services/user_preferences.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await UserPreferences.init();
  runApp(const MyApp());
}

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  List<String> _locations = [];

  @override
  void initState() {
    _locations = UserPreferences.getSavedLocations();
    super.initState();
  }

  void refresh() {
    setState(() {
      _locations = UserPreferences.getSavedLocations();
    });
  }

  Widget buildContent() {
    return DefaultTabController(
      length: _locations.length,
      child: Scaffold(
        appBar: AppBar(
          title: const Text('Wetter'),
          bottom: (_locations.isEmpty)
              ? null
              : TabBar(
                  tabs: [for (String name in _locations) Tab(icon: Text(name))],
                ),
        ),
        drawer: NavBar(
          refreshPageFrom: refresh,
        ),
        body: (_locations.isEmpty)
            ? const Text("No locations")
            : TabBarView(
                children: [
                  for (String name in _locations)
                    MainWeatherView(UserPreferences.getLat(name),
                        UserPreferences.getLon(name))
                ],
              ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Wetter',
        theme: ThemeData(
          primarySwatch: Colors.blue,
          textTheme: const TextTheme(
            headline1: TextStyle(fontSize: 72.0, fontWeight: FontWeight.bold),
            headline6: TextStyle(fontSize: 36.0, fontStyle: FontStyle.italic),
            bodyText2: TextStyle(fontSize: 14.0, fontFamily: 'Hind'),
          ),
        ),
        home: buildContent());
  }
}