Flutter How to listen variable from other class - flutter

Question

I want to listen variable from other class in flutter, so always to know if the app has internet connection
I have the streamcontroller in checknetwork.dart and listen in home.dart
I dont get anything at print statement
CheckNetwork.dart
class NetworkCheck {
var streamController = StreamController();
Future<bool> check() async {
var connectivityResult = await (Connectivity().checkConnectivity());
if (connectivityResult == ConnectivityResult.mobile) {
streamController.sink.add(true);
streamController.close();
return true;
} else if (connectivityResult == ConnectivityResult.wifi) {
streamController.sink.add(true);
streamController.close();
return true;
}
return false;
}
dynamic checkInternet(Function func) {
check().then((internet) {
if (internet != null && internet) {
func(true);
}
else{
func(false);
}
});
}
}
Home.dart
class Home extends StatefulWidget {
const Home({Key key}) : super(key: key);
#override
HomeState createState() => HomeState();
}
class HomeState extends State<Home>{
Future _checkNetwork() async {
NetworkCheck networkcheck = NetworkCheck();
networkcheck.streamController.stream.listen((data) {
print('Got! $data');
});
}

Answer 1

You need to have a state management System to get the stream controller accessible to all classes and it would be the efficient way , but if you still want your current code to work than call check method of NetworkCheck class before listening to the Stream .
So modify your home.dart like this:
class Home extends StatefulWidget {
const Home({Key key}) : super(key: key);
#override
HomeState createState() => HomeState();
}
class HomeState extends State<Home>{
Future _checkNetwork() async {
NetworkCheck networkcheck = NetworkCheck();
//this will provide value in your stream.
networkcheck.check();
networkcheck.streamController.stream.listen((data) {
print('Got! $data');
});
}