didChangeAppLifecycleState doesn't work as expected

[Tony Seng]

I hope I understand how didChangeAppLifecycleState worked correctly.

I have page A and page B . When I click the back device button from page B ( Navigator.of(context).pop();), I expect didChangeAppLifecycleState in pageA will get called, but it doesn't.

PageA

class _ABCState extends State<ABCrList> with WidgetsBindingObserver {
@override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
            ....
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed) {
      setState(() {
        print(...);
      });
    }else{
      print(state.toString());
    }
  }

....
 

[Andy Greenshaw]

No, you don’t understand.

It’s for the app life cycle, not pages (widgets).

So if the app goes into the background, or is resumed from the background etc.

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