flutter-sport/lib/services/app_lifecycle_state.dart

import 'package:flutter/material.dart';

abstract class LifecycleState<T extends StatefulWidget> extends State<T>
    with WidgetsBindingObserver {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance?.addObserver(this);
  }

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

}