PhysiGo/app/lib/main.dart

import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:latlong2/latlong.dart';
import 'navigation/navigation_page.dart';
import 'challenges/challenge_page.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

import 'firebase_options.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  handleMessages();
  runApp(const PhysiGo());
}

class PhysiGo extends StatelessWidget {
  const PhysiGo({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'PhysiGo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [Center(
          child: TextButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(
                    // Example on how to use NavigationPage
                    builder: (context) => NavigationPage(
                      destination: LatLng(51.78036111980833, 19.451262207821234),
                    ),
                  ),
                );
              },
              child: const Text('Navigation')),
        ),
        Center(
          child: TextButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(
                    // Example on how to use NavigationPage
                    builder: (context) => const ChallengePage(),
                  ),
                );
              },
              child: const Text('Challenges')),
        ),
      ],
    ));
  }
}

void handleMessages() async {
  FirebaseMessaging messaging = FirebaseMessaging.instance;
  final _firestore = FirebaseFirestore.instance;

  NotificationSettings settings = await messaging.requestPermission(
    alert: true,
    announcement: false,
    badge: true,
    carPlay: false,
    criticalAlert: false,
    provisional: false,
    sound: true,
  );


  FirebaseMessaging.onMessage.listen((RemoteMessage message) {
    print('Got a message whilst in the foreground!');
    print('Message data: ${message.data}');

    if (message.notification != null) {
      print('Message also contained a notification: ${message.notification}');
    }
  });

  messaging.onTokenRefresh.listen((fcmToken) async {
    final fcmToken = await messaging.getToken();
    final user = _firestore.collection('Users').doc('tlmysIvwTBaoZKWqBofx');
    user.update({
      'token': fcmToken,
    });
  });
}