google_maps_screen.dart

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

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

final CameraPosition _kLake = CameraPosition(
    bearing: 192.8334901395799,
    target: LatLng(37.43296265331129, -122.08832357078792),
    tilt: 59.440717697143555,
    zoom: 19.151926040649414);

class GoogleMapsScreen extends StatelessWidget {
  final Completer<GoogleMapController> _controller = Completer();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Google Maps Demo'),
      ),
      body: _buildMapView(),
    );
  }

  Widget _buildMapView() {
    return new Scaffold(
      body: GoogleMap(
        mapType: MapType.hybrid,
        initialCameraPosition: _kGooglePlex,
        onMapCreated: (GoogleMapController controller) {
          _controller.complete(controller);
        },
      ),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: _goToTheLake,
        label: Text('To the lake!'),
        icon: Icon(Icons.directions_boat),
      ),
    );
  }

  Future<void> _goToTheLake() async {
    final GoogleMapController controller = await _controller.future;
    controller.animateCamera(CameraUpdate.newCameraPosition(_kLake));
  }
}