main.dart

import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import "locations.dart" as locations;

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  MyApp({Key key}) : super(key: key);

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

 final Map<String, Marker> _markers = {};

 Future<void> _onMapCreated(GoogleMapController controller) async {
    final googleOffices = await locations.getGoogleOffices();
    setState(() {
      _markers.clear();
      for (final office in googleOffices.offices) {
        final marker = Marker(
          markerId: MarkerId(office.name),
          position: LatLng(office.lat, office.lng),
          infoWindow: InfoWindow(
            title: office.name,
            snippet: office.address,
          ),
        );
        _markers[office.name] = marker;
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('Google Maps App'),
          backgroundColor: Colors.green[700],
        ),
        body: GoogleMap(
          onMapCreated: _onMapCreated,
          initialCameraPosition: CameraPosition(
            target: LatLng(41.2878742, 36.326696),
            zoom: 6,
          ),
          markers: _markers.values.toSet(),
        ),
      ),
    );
  }
}