class _AppLifeCycleExampleState extends State<AppLifeCycleExample>

   with WidgetsBindingObserver {

 AppLifecycleState? _appLifecycleState;

 @override

 void initState() {

   super.initState();

   WidgetsBinding.instance.addObserver(this);

 }

 @override

 void dispose() {

   WidgetsBinding.instance.removeObserver(this);

   super.dispose();

 }

 @override

 void didChangeAppLifecycleState(AppLifecycleState state) {

   super.didChangeAppLifecycleState(state);

   setState(() {

     _appLifecycleState = state;

   });

 }

late final AppLifecycleListener _listener;

  final ScrollController _scrollController = ScrollController();

  final List _states = [];

  late AppLifecycleState? _state;

  @override

  void initState() {

    super.initState();

    _state = SchedulerBinding.instance.lifecycleState;

    _listener = AppLifecycleListener(

      onShow: () => _handleTransition('show'),

      onResume: () => _handleTransition('resume'),

      onHide: () => _handleTransition('hide'),

      onInactive: () => _handleTransition('inactive'),

      onPause: () => _handleTransition('pause'),

      onDetach: () => _handleTransition('detach'),

      onRestart: () => _handleTransition('restart'),

      // This fires for each state change. Callbacks above fire only for

      // specific state transitions.

      onStateChange: _handleStateChange,

    );

    if (_state != null) {

      _states.add(_state!.name);

    }

  }

  @override

  void dispose() {

    _listener.dispose();

    super.dispose();

  }

  void _handleTransition(String name) {

    setState(() {

      _states.add(name);

    });

   // обработка каждого перехода

  }

  void _handleStateChange(AppLifecycleState state) {

    setState(() {

      _state = state;

    });

  }