How do I check if the Flutter application is in the foreground or not?

Question

I don\'t want to show notification when the app is in foreground. How can I check live state of my app?

Answer 1

Simply create a bool variable which will keep track of all your background/foreground stuff.

Full code:

class _HomePageState extends State with WidgetsBindingObserver {
  // This variable will tell you whether the application is in foreground or not. 
  bool _isInForeground = true;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }
  
  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);
    _isInForeground = state == AppLifecycleState.resumed;
  }

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

  @override
  Widget build(BuildContext context) => Scaffold();
}