How to Add Multiple Markers on Google Map in Flutter?
Google Maps is one of the popular apps used nowadays for navigation or locating markers on Google Maps. We have seen markers on Google Maps for various locations. In this article, we are going to see how to implement multiple markers on Google Maps in Flutter.
Step By Step Implementation
Step 1: Create a New Project in Android Studio
To set up Flutter Development on Android Studio please refer to Android Studio Setup for Flutter Development, and then create a new project in Android Studio please refer to Creating a Simple Application in Flutter.
Step 2: Generating API Key for Using Google Maps
Check out the below article on How to generate an API key for using Google Maps. After developing that key we have to use it within our project to integrate Google Maps.
Now, follow the Steps to Implement Google Maps in the Flutter Application
Step 3: Adding Dependency to pubspec.yaml File
dependencies: flutter: google_maps_flutter: ^2.1.8
Now click on pub.get to configure.
Step 4: Update build.gradle File
Navigate to android>app>build.gradle file and update code on below line.
Change Compile SDK Version
android { compileSdkVersion 31 compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 }
Change Min SDK Version
defaultConfig { // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). applicationId "com.example.google_maps" minSdkVersion 20 targetSdkVersion 30 versionCode flutterVersionCode.toInteger() versionName flutterVersionName }
Step 5: Add API Key to Android Manifest File
Navigate to android > app > src > main > AndrodManifest.xml file and add the below code in the manifest tag. Make sure to add your Google Maps API key in the value.
<meta-data android:name="com.google.android.geo.API_KEY" android:value="Enter your API key here"/>
Step 6: Working with main.dart File
Navigate to lib > main.dart file and add the below code to it. Comments are added in the code to get to know in detail.
Dart
void main() { runApp( const MyApp()); } class MyApp extends StatelessWidget { const MyApp({Key? key}) : super(key: key); // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'GFG' , debugShowCheckedModeBanner: false , theme: ThemeData( primarySwatch: Colors.blue, ), // First Screen of our App home: const HomePage(), ); } } |
Step 7: Creating a new Dart File for Home Page
Navigate to lib > Right click on it > New > Dart File and name it as HomePage.dart. After creating that file add the below code to it. Comments are added in the code to get to know in detail.
Dart
import 'dart:async' ; import 'package:flutter/material.dart' ; import 'package:google_maps_flutter/google_maps_flutter.dart' ; class HomePage extends StatefulWidget { const HomePage({Key? key}) : super(key: key); @override _HomePageState createState() => _HomePageState(); } class _HomePageState extends State<HomePage> { // on below line we are initializing our controller for google maps. Completer<GoogleMapController> _controller = Completer(); // on below line we are specifying our camera position static final CameraPosition _kGoogle = const CameraPosition( target: LatLng(37.42796133580664, -122.885749655962), zoom: 14.4746, ); // on below line we have created list of markers List<Marker> _marker = []; final List<Marker> _list = const [ // List of Markers Added on Google Map Marker( markerId: MarkerId( '1' ), position: LatLng(20.42796133580664, 80.885749655962), infoWindow: InfoWindow( title: 'My Position' , ) ), Marker( markerId: MarkerId( '2' ), position: LatLng(25.42796133580664, 80.885749655962), infoWindow: InfoWindow( title: 'Location 1' , ) ), Marker( markerId: MarkerId( '3' ), position: LatLng(20.42796133580664, 73.885749655962), infoWindow: InfoWindow( title: 'Location 2' , ) ), ]; @override void initState() { // TODO: implement initState super.initState(); _marker.addAll(_list); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( backgroundColor: Color(0xFF0F9D58), title: Text( "GFG" ), ), body: Container( // on below line creating google maps. child: GoogleMap( // on below line setting camera position initialCameraPosition: _kGoogle, // on below line specifying map type. mapType: MapType.normal, // on below line setting user location enabled. myLocationEnabled: true , // on below line setting compass enabled. compassEnabled: true , // on below line specifying controller on map complete. onMapCreated: (GoogleMapController controller){ _controller.complete(controller); }, ), ) ); } } |
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