如何检测应用程序何时从 Flutter 中最近的应用程序中删除？

Question

我正在尝试检测我的 Flutter 应用程序何时从最近的应用程序列表中删除。我尝试将 AppLifecycleState.detached 与 WidgetsBindingObserver 结合使用，但似乎永远不会触发分离状态。以下是我使用的代码：

import 'package:flutter/material.dart';

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> 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.detached) {
      // App was closed from recent tabs
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('My App'),
        ),
        body: Center(
          child: Text('Hello, World!'),
        ),
      ),
    );
  }
}

但是，当我从最近的应用程序列表中删除该应用程序时，AppLifecycleState.detached 永远不会被触发。如何正确检测这种情况？有替代方法或解决方案来解决这个问题吗？

Answer 1

尝试使用

state == AppLifecycleState.resum

和

state == AppLifecycleState.paused

示例 -

   @override
      void didChangeAppLifecycleState(AppLifecycleState state) {
        if (state == state == AppLifecycleState.paused) {
          // App was closed from recent tabs
        } if (state == state == AppLifecycleState.resum) {
          // App was closed from recent tabs
        }
      }