inicio de estrcutura
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hack_23031087_872edb
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import 'package:flutter/material.dart';
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// ================================================================
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// main.dart — Punto de entrada de la aplicación
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// ================================================================
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//
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// RESPONSABILIDADES:
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// 1. Inicializar Firebase (requerido antes de runApp)
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// 2. Configurar el tema visual de la app
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// 3. Definir el router básico de pantallas
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//
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// ATAJO DE HACKATHON:
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// Sin state management complejo (Riverpod/Bloc). Usamos
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// setState + shared_preferences para el MVP. Suficiente.
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// ================================================================
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void main() {
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runApp(const MyApp());
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import 'package:flutter/material.dart';
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import 'package:firebase_core/firebase_core.dart';
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import 'package:firebase_messaging/firebase_messaging.dart';
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import 'screens/login_screen.dart';
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import 'screens/home_screen.dart';
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// ----------------------------------------------------------------
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// HANDLER DE MENSAJES EN BACKGROUND
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//
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// Firebase requiere que este handler sea una función TOP-LEVEL
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// (fuera de cualquier clase). Se ejecuta cuando llega una
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// notificación y la app está en segundo plano o cerrada.
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// ----------------------------------------------------------------
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@pragma('vm:entry-point')
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Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
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// IMPORTANTE: Si el handler hace operaciones async pesadas,
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// también hay que inicializar Firebase aquí.
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await Firebase.initializeApp();
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debugPrint('📬 [Background] Mensaje recibido: ${message.messageId}');
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// TODO: Aquí puedes guardar el mensaje en local storage para mostrarlo
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// después cuando el usuario abra la app.
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}
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class MyApp extends StatelessWidget {
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const MyApp({super.key});
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// ----------------------------------------------------------------
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// FUNCIÓN MAIN — Punto de entrada real de Flutter
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// ----------------------------------------------------------------
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void main() async {
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// WidgetsFlutterBinding.ensureInitialized() es OBLIGATORIO
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// antes de cualquier código async en main(). Inicializa el
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// binding entre Flutter y el sistema operativo.
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WidgetsFlutterBinding.ensureInitialized();
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// Inicializar Firebase — REQUIERE que hayas corrido:
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// > flutterfire configure
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// Ese comando genera lib/firebase_options.dart automáticamente.
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//
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// ATAJO: Si aún no tienes Firebase configurado, comenta las
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// siguientes 3 líneas y la app correrá sin notificaciones.
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// -------------------------------------------------------
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// await Firebase.initializeApp(
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// options: DefaultFirebaseOptions.currentPlatform,
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// );
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// FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
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// -------------------------------------------------------
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runApp(const ResiduosApp());
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}
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// ----------------------------------------------------------------
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// WIDGET RAÍZ DE LA APLICACIÓN
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// ----------------------------------------------------------------
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class ResiduosApp extends StatelessWidget {
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const ResiduosApp({super.key});
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// This widget is the root of your application.
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter Demo',
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title: 'Recolección Inteligente',
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debugShowCheckedModeBanner: false, // Quita el banner rojo de DEBUG
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// --------------------------------------------------------
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// TEMA VISUAL
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// Verde oscuro = sostenibilidad y medio ambiente.
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// Fácil de cambiar para el pitch/demo.
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// --------------------------------------------------------
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theme: ThemeData(
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// This is the theme of your application.
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//
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// TRY THIS: Try running your application with "flutter run". You'll see
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// the application has a purple toolbar. Then, without quitting the app,
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// try changing the seedColor in the colorScheme below to Colors.green
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// and then invoke "hot reload" (save your changes or press the "hot
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// reload" button in a Flutter-supported IDE, or press "r" if you used
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// the command line to start the app).
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//
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// Notice that the counter didn't reset back to zero; the application
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// state is not lost during the reload. To reset the state, use hot
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// restart instead.
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//
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// This works for code too, not just values: Most code changes can be
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// tested with just a hot reload.
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colorScheme: .fromSeed(seedColor: Colors.deepPurple),
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),
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home: const MyHomePage(title: 'Flutter Demo Home Page'),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({super.key, required this.title});
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// This widget is the home page of your application. It is stateful, meaning
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// that it has a State object (defined below) that contains fields that affect
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// how it looks.
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// This class is the configuration for the state. It holds the values (in this
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// case the title) provided by the parent (in this case the App widget) and
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// used by the build method of the State. Fields in a Widget subclass are
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// always marked "final".
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final String title;
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@override
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State<MyHomePage> createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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int _counter = 0;
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void _incrementCounter() {
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setState(() {
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// This call to setState tells the Flutter framework that something has
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// changed in this State, which causes it to rerun the build method below
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// so that the display can reflect the updated values. If we changed
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// _counter without calling setState(), then the build method would not be
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// called again, and so nothing would appear to happen.
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_counter++;
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});
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}
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@override
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Widget build(BuildContext context) {
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// This method is rerun every time setState is called, for instance as done
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// by the _incrementCounter method above.
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//
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// The Flutter framework has been optimized to make rerunning build methods
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// fast, so that you can just rebuild anything that needs updating rather
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// than having to individually change instances of widgets.
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return Scaffold(
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appBar: AppBar(
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// TRY THIS: Try changing the color here to a specific color (to
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// Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
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// change color while the other colors stay the same.
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backgroundColor: Theme.of(context).colorScheme.inversePrimary,
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// Here we take the value from the MyHomePage object that was created by
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// the App.build method, and use it to set our appbar title.
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title: Text(widget.title),
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),
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body: Center(
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// Center is a layout widget. It takes a single child and positions it
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// in the middle of the parent.
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child: Column(
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// Column is also a layout widget. It takes a list of children and
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// arranges them vertically. By default, it sizes itself to fit its
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// children horizontally, and tries to be as tall as its parent.
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//
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// Column has various properties to control how it sizes itself and
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// how it positions its children. Here we use mainAxisAlignment to
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// center the children vertically; the main axis here is the vertical
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// axis because Columns are vertical (the cross axis would be
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// horizontal).
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//
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// TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
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// action in the IDE, or press "p" in the console), to see the
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// wireframe for each widget.
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mainAxisAlignment: .center,
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children: [
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const Text('You have pushed the button this many times:'),
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Text(
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'$_counter',
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style: Theme.of(context).textTheme.headlineMedium,
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),
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],
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colorScheme: ColorScheme.fromSeed(
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seedColor: const Color(0xFF2E7D32), // Verde oscuro
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brightness: Brightness.light,
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),
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useMaterial3: true,
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fontFamily: 'Roboto',
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),
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floatingActionButton: FloatingActionButton(
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onPressed: _incrementCounter,
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tooltip: 'Increment',
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child: const Icon(Icons.add),
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),
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// --------------------------------------------------------
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// ROUTER SIMPLE
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// Dos rutas: login (/) y home (/home).
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// Pasamos el usuario_id a /home via arguments.
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// --------------------------------------------------------
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initialRoute: '/',
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routes: {
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'/': (context) => const LoginScreen(),
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'/home': (context) => const HomeScreen(),
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},
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);
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}
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}
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