How to access android Accessibility Service events from background service? - flutter

Question

I am trying to access Accessibility from my background service app which uses flutter_background_service plugin. But I can't listen to the Accessibility events. I am also receiving an error:
Tried to send a platform message to Flutter, but FlutterJNI was detached from native C++. Could not send. Channel: x-slayer/accessibility_event. Response ID: 34
But when the app is open(in recent app) the service is working fine. How do I fix it?
Here is my code. I am trying to fix this for a day, but cant find a way out:
Future<void> initializeService() async {
final service = FlutterBackgroundService();
await service.configure(
androidConfiguration: AndroidConfiguration(
// this will be executed when app is in foreground or background in separated isolate
onStart: onStart,
// auto start service
autoStart: true,
isForegroundMode: true,
),
iosConfiguration: IosConfiguration(
// auto start service
autoStart: true,
// this will be executed when app is in foreground in separated isolate
onForeground: onStart,
// you have to enable background fetch capability on xcode project
onBackground: onIosBackground,
),
);
service.startService();
}
bool onIosBackground(ServiceInstance service) {
WidgetsFlutterBinding.ensureInitialized();
print('FLUTTER BACKGROUND FETCH');
return true;
}
void onStart(ServiceInstance service) async {
// Only available for flutter 3.0.0 and later
DartPluginRegistrant.ensureInitialized();
// For flutter prior to version 3.0.0
// We have to register the plugin manually
if (service is AndroidServiceInstance) {
service.on('setAsForeground').listen((event) {
service.setAsForegroundService();
});
service.on('setAsBackground').listen((event) {
service.setAsBackgroundService();
});
}
service.on('stopService').listen((event) {
service.stopSelf();
});
// bring to foreground
Timer.periodic(const Duration(seconds: 1), (timer) async {
if (service is AndroidServiceInstance) {
service.setForegroundNotificationInfo(
title: "My App Service",
content: "Updated at ${DateTime.now()}",
);
}
/// you can see this log in logcat
print('FLUTTER BACKGROUND SERVICE: ${DateTime.now()}');
void PeaceBox() {
StreamSubscription<AccessibilityEvent>? _subscription;
List<AccessibilityEvent?> events = [];
overlayRequest();
print("Started listening");
// FlutterOverlayWindow.overlayListener.listen((event) {
// print("$event");
// });
String text = "";
// print(text.split(" "));
FlutterAccessibilityService.accessStream.listen((event) {
});
}
PeaceBox();
// test using external plugin
final deviceInfo = DeviceInfoPlugin();
String? device;
if (Platform.isAndroid) {
final androidInfo = await deviceInfo.androidInfo;
device = androidInfo.model;
}
if (Platform.isIOS) {
final iosInfo = await deviceInfo.iosInfo;
device = iosInfo.model;
}
service.invoke(
'update',
{
"current_date": DateTime.now().toIso8601String(),
"device": device,
},
);
});
}