使用flutter HookWidget和didChangeAppLifecycleState

import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';

class LifecycleAwareWidget extends HookWidget {
  @override
  Widget build(BuildContext context) {
    final appLifecycleState = useAppLifecycleState();

    return Scaffold(
      appBar: AppBar(
        title: Text('Lifecycle Aware Widget'),
      ),
      body: Center(
        child: Text('Current lifecycle state: ${appLifecycleState.toString()}'),
      ),
    );
  }
}

extension HooksWidgetExtension on HookWidget {
  AppLifecycleState get appLifecycleState => useAppLifecycleState();
}

extension WidgetsBindingHooks on WidgetsBinding {
  AppLifecycleState useAppLifecycleState() {
    final _appLifecycleState = useState<AppLifecycleState>(WidgetsBinding.instance.lifecycleState);
    WidgetsBinding.instance.addObserver((_) {
      setState(() {
        _appLifecycleState.value = WidgetsBinding.instance.lifecycleState;
      });
    });
    return _appLifecycleState.value;
  }
}

void main() {
  runApp(MaterialApp(
    home: LifecycleAwareWidget(),
  ));
}

if (appLifecycleState == AppLifecycleState.paused) {
  // 执行进入后台时的操作
}