class _HomePageState extends State<HomePage> 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();
}

@override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    switch (state) {
      case AppLifecycleState.resumed:
        //다시돌아왔을때
        print("app in resumed");
        break;
      case AppLifecycleState.inactive:
        //나갔을때
        print("app in inactive");
        break;
      case AppLifecycleState.paused:
        //나간거 인식하고 앱 멈춤
        print("app in paused");
        break;
      case AppLifecycleState.detached:
        print("app in detached");
        break;
    }
    // super.didChangeAppLifecycleState(state);
    // _isInForeground = state == AppLifecycleState.resumed;
  }