Flutter - how do I send/receive data between different class? - dart

Question

I want to get a current user location to update nearby stores based on latitude/longitude inside the url.
but I can't figure out how to interact data between two different class.
I want to make it work something like 'AppConfig.latitude = _position.latitude;'. I tried with several methods including inherited widget that I found on stackoverflow and youtube, but still don't work. It's definitely that I'm missing something.
when I use a bloc, I have no clue how to update data inside 'class AppConfig' with bloc. Can it be done simply using SetState? I spent the whole day yesterday Googling for this problem. please guide me to right approach
class _CurrentLocationState extends State<CurrentLocation> {
Position _position;
Future<void> _initPlatformState() async {
Position position;
try {
final Geolocator geolocator = Geolocator()
...
setState(() {
_position = position;
// print(${_position.latitude})
// 35.9341...
// print(${_position.longitude})
// -117.0912...
<*I want to make it work something like this*>
AppConfig.latitude = _position.latitude;
AppConfig.longitude = _position.longitude;
<*this is how I tried with bloc*>
latLongBloc.getUserLocation(LatLng(position.latitude, position.longitude));
});
<* latitude/longitude need to be updated with a current user location *>
abstract class AppConfig {
static const double latitude = 0;
static const double longitude = 0;
static const List<String> storeName = ['starbucks'];
}
<* I need to use AppConfig.latitude for url in Repository class*>
class Repository {
...
Future<List<Business>> getBusinesses() async {
String webAddress =
"https://api.yelp.com/v3/businesses/search?latitude=${AppConfig.latitude}&longitude=${AppConfig.longitude}&term=${AppConfig.storeName}";
...
}
this is my bloc.dart file
class LatLongBloc {
StreamController _getUserLocationStreamController = StreamController<LatLng>();
Stream get getUserLocationStream => _getUserLocationStreamController.stream;
dispose(){
_getUserLocationStreamController.close();
}
getUserLocation(LatLng userLatLong) {
_getUserLocationStreamController.sink.add(userLatLong);
}
}
final latLongBloc = LatLongBloc();

Answer 1

You want to share state between classes/widgets, right? There are also other state management patterns like ScopedModel or Redux. Each pattern has its pros and cons, but you don't have to use BLoC if you don't understand it.
I would recommend to use ScopedModel because it's quite easy to understand in my opinion. Your data/state is in a central place and can be accessed by using ScopedModel. If you don't like to use this approach then try Redux or other patterns :)
Hope it helped you :D
Yours Glup3