What is the equivalent code in flutter for " mAdapter.notifyDataSetChanged();"; - flutter

Question

Befor HTTP response show loading and after https response create tab view. I successfully create tab view but my problem is after HTTP request unable to update the view in the android studio with java we use
`mAdapter.notifyDataSetChanged();
mActivity.runOnUiThread(new Runnable() {
#Override
public void run() {
}
});`
code for doing this.
what is the equivalent code in the flutter?

Answer 1

If you want update any widget in flutter you should call setState((){})
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<MyApp> {
bool isLoading = false;
#override
void initState() {
super.initState();
isLoading = true;
getData();
}
#override
Widget build(BuildContext context) {
return isLoading ? new CircularProgressIndicator() : // show list;
}
Future<ModelClass> getData() async {
// get data from http
...
// after processing response
setState(() {
isLoading = false;
});
}
}

Answer 2

In Flutter, the UI is updated when the State is changed using setState method.
In your case, you will need some variables (E.x: isLoading, items (for your list)).
When the app loads data from backend, isLoading = true, items = [] (empty). When the request is done, isLoading = false and items = [item1, item2,...]. Here is where you have to use setState method to update your UI.
Under your build method, you have to use these 2 variables to render the corresponding UI.