print函数应该根据生命周期转换被调用，但是它们都没有被调用。为了测试这一点，我在调试模式下运行应用程序，并将其移到后台/前台（即切换到另一个应用程序，然后返回到该应用程序）。

我做错了什么？

import 'package:flutter/material.dart';

class StopwatchVw extends StatefulWidget {
  const StopwatchVw({Key? key}) : super(key: key);
  @override _StopwatchVwState createState() => _StopwatchVwState();
}

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

  @override
  Future<void> didChangeAppLifecycleState(AppLifecycleState state) {
    print('Changed');

    switch (state) {
      case AppLifecycleState.inactive:
        print("Inactive");
        break;
      case AppLifecycleState.paused:
        print("Paused");
        break;
      case AppLifecycleState.resumed:
        print("Resumed");
        break;
      case AppLifecycleState.detached:
        print("Suspending");
        break;
    }
  }

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

  @override
    Widget build(BuildContext context) {
      return Scaffold(body: Text('HEY'));
    }

这是我的主要.镖：

import 'package:bitsdojo_window/bitsdojo_window.dart';
import 'package:clocker/stopwatch_vw.dart';
import 'package:flutter/material.dart';
import 'package:flutter_acrylic/flutter_acrylic.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Window.initialize();
  await Window.hideWindowControls();

  runApp(const MyApp());

  doWhenWindowReady(() {
    const initialSize = Size(350, 200);
    appWindow
      ..size = initialSize
      ..minSize = initialSize
      ..maxSize = initialSize
      ..alignment = Alignment.bottomRight
      ..show();
  });

  Window.setEffect(
    effect: WindowEffect.acrylic,
    color: const Color.fromARGB(29, 250, 250, 227),
  );
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MoveWindow(child: const StopwatchVw())
    );
  }
}