使用Flutter定位包获取地理位置

　　class GetUserLocation extends StatefulWidget {

　　GetUserLocation({Key? key, required this.title}) : super(key: key);

　　final String title;

　　@override

　　_GetUserLocationState createState() => _GetUserLocationState();

　　}

　　class _GetUserLocationState extends State {

　　LocationData? currentLocation;

　　String address = "";

　　@override

　　Widget build(BuildContext context) {

　　return Scaffold(

　　appBar: AppBar(),

　　body: Center(

　　child: Padding(

　　padding: EdgeInsets.all(16.0),

　　child: Column(

　　mainAxisAlignment: MainAxisAlignment.center,

　　children: [

　　if (currentLocation != null)

　　Text(

　　"Location: ${currentLocation?.latitude}, ${currentLocation?.longitude}"),

　　if (currentLocation != null) Text("Address: $address"),

　　MaterialButton(

　　onPressed: () {

　　_getLocation().then((value) {

　　LocationData? location = value;

　　_getAddress(location?.latitude, location?.longitude)

　　.then((value) {

　　setState(() {

　　currentLocation = location;

　　address = value;

　　});

　　});

　　});

　　},

　　color: Colors.purple,

　　child: Text(

　　"Get Location",

　　style: TextStyle(color: Colors.white),

　　),

　　),

　　],

　　),

　　),

　　),

　　);

　　}

　　Future _getLocation() async {

　　Location location = new Location();

　　LocationData _locationData;

　　bool _serviceEnabled;

　　PermissionStatus _permissionGranted;

　　_serviceEnabled = await location.serviceEnabled();

　　if (!_serviceEnabled) {

　　_serviceEnabled = await location.requestService();

　　if (!_serviceEnabled) {

　　return null;

　　}

　　}

　　_permissionGranted = await location.hasPermission();

　　if (_permissionGranted == PermissionStatus.denied) {

　　_permissionGranted = await location.requestPermission();

　　if (_permissionGranted != PermissionStatus.granted) {

　　return null;

　　}

　　}

　　_locationData = await location.getLocation();

　　return _locationData;

　　}

　　Future _getAddress(double? lat, double? lang) async {

　　if (lat == null || lang == null) return "";

　　GeoCode geoCode = GeoCode();

　　Address address =

　　await geoCode.reverseGeocoding(latitude: lat, longitude: lang);

　　return "${address.streetAddress}, ${address.city}, ${address.countryName}, ${address.postal}";

　　}

　　}