How I can call setstate from another file? - flutter

Question

I have class :
class FavoritesState extends State<Favorites> {
var configOk = isConfigLoaded;
#override
Widget build(BuildContext context) {
if (configOk) {
return Padding(
padding: EdgeInsets.only(top: 10),
child: ListView.builder(
itemCount: stationList.length,
itemBuilder: (context, position) {
return StationCard(stationList[position]);
},
),
);
} else {
return LoadingScreen();
}
}
void callback() {
setState(() {
this.configOk = true;
});
}
}
And I have method:
Future<http.Response> getConfig() async {
//Load Config
isConfigLoaded = true;
}
I need at the end this method call setstate in FavoritesState and upload information there. How I can do this? Thank you.

Answer 1

You can also use a FutureBuilder if you're only updating the state of the widget once. The FutureBuilder will force your widget to rebuild as soon as your getConfig() call has completed.
This would simplify things:
class Favorites extends StatelessWidget {
#override
Widget build(BuildContext context) {
return FutureBuilder(
future: getConfig(),
builder: (context, snapshot) {
if (snapshot.data == null) {
// display the loading screen as long as your getConfig() call hasn't finished
return LoadingScreen();
}
return Padding(
padding: EdgeInsets.only(top: 10),
child: ListView.builder(
itemCount: stationList.length,
itemBuilder: (context, position) {
return StationCard(stationList[position]);
},
),
);
},
);
}
}
And then tweak your call to something like this:
Future<http.Response> getConfig() async {
//Load Config
// return your result
return result;
}