How do i initialize the non nullable instance in flutter - flutter

Question

`
class Location{
late double lat;
late double lon;
void getLocation( ) async{
Position position = await _determinePosition();
lat=position.latitude;
lon=position.longitude;
}
Future<Position> _determinePosition() async {
LocationPermission permission;
permission=await Geolocator.checkPermission();
if(permission==LocationPermission.denied){
permission=await Geolocator.requestPermission();
if(permission==LocationPermission.denied){
return Future.error('Permission Denied');
}
}
return await Geolocator.getCurrentPosition();
}
}
`How to initialize the value of varibale lat and lon in this? ,
i have done everything in my reach, but it always ends with error 'Non-nullable instance field 'lon' must be initialized. (Documentation) Try adding an initializer expression, or a generative constructor that initializes it, or mark it 'late'.
and if i add late than it show runtime error on my device,that late variable should be initialized.

Answer 1

double? lat;
double? lng;
///get location
void getLocation(pr) async {
await [
Permission.location,
].request();
if (await Permission.locationWhenInUse.serviceStatus.isEnabled) {
print('no');
}
Position position = await Geolocator.getCurrentPosition( desiredAccuracy: LocationAccuracy.high);
lat = position.latitude;
lng = position.longitude;
}