Flutter如何在无状态小部件中使用生命周期事件？关闭应用程序

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Lifecycle Example')),
        body: LifecycleObserver(),
      ),
    );
  }
}

class LifecycleObserver extends StatefulWidget {
  @override
  _LifecycleObserverState createState() => _LifecycleObserverState();
}

class _LifecycleObserverState extends State<LifecycleObserver> with WidgetsBindingObserver {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }

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

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.paused) {
      // 应用程序进入后台或关闭时调用
      print('App is paused or closed');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Center(child: Text('Check the console for lifecycle events'));
  }
}

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Cleanup Example')),
        body: CleanupWidget(),
      ),
    );
  }
}

class CleanupWidget extends StatelessWidget {
  void _cleanup(SendPort sendPort) async {
    // 执行清理工作
    print('Performing cleanup...');
    await Future.delayed(Duration(seconds: 2)); // 模拟耗时操作
    sendPort.send('Cleanup done');
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: ElevatedButton(
        onPressed: () async {
          final receivePort = ReceivePort();
          await Isolate.spawn(_cleanup, receivePort.sendPort);
          final result = await receivePort.first;
          print(result);
        },
        child: Text('Perform Cleanup'),
      ),
    );
  }
}

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Native Cleanup Example')),
        body: NativeCleanupWidget(),
      ),
    );
  }
}

class NativeCleanupWidget extends StatelessWidget {
  static const platform = const MethodChannel('com.example/app');

  @override
  Widget build(BuildContext context) {
    return Center(
      child: ElevatedButton(
        onPressed: () async {
          try {
            await platform.invokeMethod('performCleanup');
            print('Native cleanup performed');
          } on PlatformException catch (e) {
            print("Failed to perform native cleanup: ${e.message}");
          }
        },
        child: Text('Perform Native Cleanup'),
      ),
    );
  }
}