Adding a Map with Marker

Introduction

Map with Marker Example

This tutorial shows you how to add a Google map to your Flutter app. The map includes a marker, also called a pin, to indicate a specific location.

Getting the code

Clone or download the Flutter samples repository. The sample code can be found in the google_maps directory.

Setting up your development project

Be sure you've completed the steps outlined in the Set up a Flutter project guide before continuing with this topic.

1. Import the Google Maps for Flutter package

Open your main.dart file in your preferred IDE.
Verify that following import statement has been added to the file:

import 'package:google_maps_flutter/google_maps_flutter.dart';

2. Add Google Maps to your Flutter app

Within the Scaffold widget, add a GoogleMap widget as the body.

GoogleMap(
   initialCameraPosition: CameraPosition(
      target: _center,
      zoom: 11.0,
   ),
   markers: {
      const Marker(
         markerId: MarkerId('Sydney'),
         position: LatLng(-33.86, 151.20),
      )
   },
)

The markerId option labels your marker.
The position option sets where the marker appears on your map.

3. Building and running your app

Start the Flutter app using one of the following options:

From your IDE, click the Run button
From the command line, run flutter run.

You should see a map with a marker centered on Sydney on the east coast of Australia, similar to the image on this page.

Troubleshooting

If you don't see a map, check that you've obtained an API key and added it to the app.
If you used the iOS bundle identifier to restrict the API key, edit the key to add the bundle identifier for the app: com.google.examples.map-with-marker.
Ensure that you have a good WiFi or GPS connection.
Use the Flutter DevTools to view logs and debug the app.
You can learn more about Running a Flutter app.

4. Understanding the code

This code can be found on GitHub.

Import the necessary packages and initialize the app.

   import 'package:flutter/material.dart';
   import 'package:google_maps_flutter/google_maps_flutter.dart';

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

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

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

Create a map centered on Sydney, Australia.

class _MyAppState extends State<MyApp> {
   
   late GoogleMapController mapController;
   
   final LatLng _center = const LatLng(-33.86, 151.20);
   
   void _onMapCreated(GoogleMapController controller) {
      mapController = controller;
   }

Add the widgets needed to display a Map in an app.

@override
Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Maps Sample App'),
          backgroundColor: Colors.green[700],
        ),
        body: GoogleMap(
            onMapCreated: _onMapCreated,
            initialCameraPosition: CameraPosition(
              target: _center,
              zoom: 11.0,
            ), // CameraPosition
        ), // GoogleMap
      ), // Scaffold
    ); // MaterialApp
  }
}

Add the markers widgets to add the widget to your app.

   body: GoogleMap(
      onMapCreated: _onMapCreated,
      initialCameraPosition: CameraPosition(
         target: _center,
         zoom: 11.0,
      ),
      markers: {
         const Marker(
               markerId: const MarkerId("Sydney"),
               position: LatLng(-33.86, 151.20),
            ), // Marker
      }, // markers
   ), // GoogleMap
   ...

Add an info window to the marker.

      const Marker(
            markerId: const MarkerId("Sydney"),
            position: LatLng(-33.86, 151.20),
            infoWindow: InfoWindow(
               title: "Sydney",
               snippet: "Capital of New South Wales",
            ), // InfoWindow
      ), //Marker
      ...

By default, the Google Maps for Flutter package displays the content of the info window when the user taps a marker. There's no need to add a click listener for the marker if you're happy to use the default behavior.

Congratulations! You've built an Flutter app that displays a Google map with a marker to indicate a particular location and provide additional information in an info window. You've also learned how to use the Google Maps for Flutter package.

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