How to integrate google map in flutter?

To integrate Google Maps into a Flutter app, you can use the google_maps_flutter package. 

Here are the steps to use it:

• Add the google_maps_flutter dependency to your pubspec.yaml file.

dependencies:
  google_maps_flutter: ^0.7.0

• Obtain an API key from the Google Cloud Console.
• Add the API key to your AndroidManifest.xml file (for Android) and your Info.plist file (for iOS).
• Import the package into your Dart file.

import 'package:google_maps_flutter/google_maps_flutter.dart';

Use the GoogleMap widget in your app, providing the required MapController and CameraPosition objects.

GoogleMap(
  mapType: MapType.normal,
  initialCameraPosition: CameraPosition(
    target: LatLng(37.42796133580664, -122.085749655962),
    zoom: 14.4746,
  ),
  onMapCreated: (GoogleMapController controller) {
    _controller.complete(controller);
  },
),

Example:

import 'dart:async';

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

class MapSample extends StatefulWidget {
  @override
  State<MapSample> createState() => MapSampleState();
}

class MapSampleState extends State<MapSample> {
  Completer<GoogleMapController> _controller = Completer();

  static final CameraPosition _kGooglePlex = CameraPosition(
    target: LatLng(37.42796133580664, -122.085749655962),
    zoom: 14.4746,
  );

  @override
  Widget build(BuildContext context) {
    return GoogleMap(
      mapType: MapType.normal,
      initialCameraPosition: _kGooglePlex,
      onMapCreated: (GoogleMapController controller) {
        _controller.complete(controller);
      },
    );
  }
}

In this example, the MapSample widget displays a normal-type Google Map with the initial camera position set to _kGooglePlex. Once the map is created, the Completer object _controller is used to complete the GoogleMapController. The onMapCreated callback is triggered when the map is ready and passes the GoogleMapController to the _controller.complete method to meet the future.