Flutter WidgetsBindingObserver's didChangeAppLifecycleState not being called on Windows Desktop - windows

Question

The print functions should be called according to the lifecycle transitions, but none of them are being called. To test this, I'm running the app in debug mode and moving it to the background/foreground (i.e. changing to another app and then returning to this app).
What am I doing wrong?
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'));
}
This is my main.dart:
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())
);
}
}

Answer 1

Flutter currently doesn't support LifeCycle events on the desktop, But there is an existing issue which is being tracked here #30735.
Currently, you can determine the status of your application with the window_manager package
class Windows extends StatefulWidget {
const Windows({super.key});
#override
State<Windows> createState() => _WindowsState();
}
class _WindowsState extends State<Windows> with WindowListener {
#override
void onWindowClose() {
// do something
}
#override
void onWindowFocus() {
// do something
}
#override
void onWindowMinimize() {
// do something
}
#override
void initState() {
windowManager.addListener(this);
super.initState();
}
#override
void dispose() {
windowManager.removeListener(this);
super.dispose();
}