Life cycle in flutter

Question

Does flutter have a method like Activity.resume() which can tell developer the user has gone back to the activity.

When I pick the data from internet in

Answer 1

I don't think flutter app lifecycle callbacks are going to help you here. You can try this logic.

In 1st page (when navigating to 2nd page)

Navigator.push(context, MaterialPageRoute(builder: (context) => Page2())).then((value) {
  print("Value returned form Page 2 = $value");
};

In 2nd page (when navigating back to 1st page)

Navigator.pop(context, returnedValue);

---

Lifecycle callback

void main() => runApp(HomePage());

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

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

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);
    print("Current state = $state");
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text("Lifecycle")),
        body: Center(child: Text("Center"),),
      ),
    );
  }

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