LateInitializationError: Field 'currentLatLng' has not been initialized in Flutter - flutter

Question

I am displaying my current location on google maps using this library: package:location/location.dart. Pub Dev Link
The problem is whenever I open the app in release mode it crashes and shows:
LateInitializationError: Field 'currentLatLng' has not been
initialized
It does not crash in debug mode on an Android Device.
It does, however, crash on iOS (release and debug mode).
I am not sure what I am doing wrong. Here's my widget and attempt:
class TestGoogle extends StatefulWidget {
const TestGoogle({Key? key}) : super(key: key);
#override
_TestGoogleState createState() => _TestGoogleState();
}
class _TestGoogleState extends State<TestGoogle> {
late LatLng currentLatLng;
late GoogleMapController mapController;
Location location = new Location();
var latitude;
var longitude;
late LocationData _locationData;
get() async {
_locationData = await location.getLocation();
latitude = _locationData.latitude;
longitude = _locationData.longitude;
setState(() {
currentLatLng = new LatLng(latitude, longitude);
});
}
#override
initState() {
super.initState();
get();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: GoogleMap(
myLocationEnabled: true,
onCameraMove: (CameraPosition cameraPosition) {
print(cameraPosition.zoom);
},
initialCameraPosition:
CameraPosition(target: currentLatLng, zoom: 15.0),
),
);
}
}

Answer 1

The below codes should fix your problem. Your problem reason, try use variable before initializing.
class TestGoogle extends StatelessWidget {
TestGoogle({Key? key}) : super(key: key);
late GoogleMapController mapController;
Location location = Location();
Future<LatLng> get() async {
final _locationData = await location.getLocation();
return LatLng(_locationData.latitude, _locationData.longitude);
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: FutureBuilder<LatLng>(
future: get(),
builder: (context, snapshot) {
if (snapshot.hasData) {
final locationModel = snapshot.data!;
final latitude = locationModel.latitude;
final longitude = locationModel.longitude;
return GoogleMap(
myLocationEnabled: true,
onCameraMove: (CameraPosition cameraPosition) {
print(cameraPosition.zoom);
},
initialCameraPosition: CameraPosition(target: locationModel, zoom: 15.0),
);
}
return const CircularProgressIndicator();
},
),
);
}
}

Answer 2

I Fixed this by
class TestGoogle extends StatefulWidget {
const TestGoogle({Key? key}) : super(key: key);
#override
_TestGoogleState createState() => _TestGoogleState();
}
class _TestGoogleState extends State<TestGoogle> {
LatLng? currentLatLng;
late GoogleMapController mapController;
Location location = new Location();
var latitude;
var longitude;
late LocationData _locationData;
get() async {
_locationData = await location.getLocation();
latitude = _locationData.latitude;
longitude = _locationData.longitude;
setState(() {
currentLatLng = new LatLng(latitude, longitude);
});
}
#override
initState() {
super.initState();
get();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: currentLatLng == null
? Center(child: PlatformCircularProgressIndicator())
: GoogleMap(
myLocationEnabled: true,
onCameraMove: (CameraPosition cameraPosition) {
print(cameraPosition.zoom);
},
initialCameraPosition:
CameraPosition(target: currentLatLng, zoom: 15.0),
),
);
}
}