如何在flutter中从googlemap中获取城市和国家名称？

import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:geolocator/geolocator.dart';

class MapScreen extends StatefulWidget {
  @override
  _MapScreenState createState() => _MapScreenState();
}

class _MapScreenState extends State<MapScreen> {
  GoogleMapController mapController;
  Position currentPosition;

  @override
  void initState() {
    super.initState();
    getCurrentLocation();
  }

  void getCurrentLocation() async {
    Position position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high);
    setState(() {
      currentPosition = position;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: GoogleMap(
        onMapCreated: (GoogleMapController controller) {
          mapController = controller;
        },
        initialCameraPosition: CameraPosition(
          target: LatLng(currentPosition.latitude, currentPosition.longitude),
          zoom: 15,
        ),
      ),
    );
  }
}

import 'package:geocoding/geocoding.dart';

void getCityAndCountryName() async {
  List<Placemark> placemarks = await placemarkFromCoordinates(
      currentPosition.latitude, currentPosition.longitude);
  Placemark place = placemarks[0];
  String city = place.locality;
  String country = place.country;
  print('City: $city');
  print('Country: $country');
}