Displaying overlay when the app is closed about flutter_overlay_window HOT 19 CLOSED

i don't know how your code exactly will make the app works even when the main is closed but if you try to run the example you will find that It works fine on the background thread else you can use one of the background tasks plugins such like foreground_task flutter

from flutter_overlay_window.

I have a basic broadcast receiver, which is triggered on any incmoing call. Based on whether my app is in foreground or background(closed), it invokes flutter callbacks. This is also done in the Telephony plugin for SMS. This part is working. In my background callback I am simply calling FlutterOverlayWindow.showOverlay. Here I am getting the above error

void onNewCallBg(String msg) {
    //background callback
    debugPrint("new incoming call : $msg");
    await FlutterOverlayWindow.showOverlay(
    height: 500,
    enableDrag: true,
    overlayMessage: "TEST",
    alignment: OverlayAlignment.center,
    );
    FlutterOverlayWindow.shareData(jsonEncode(msg));
}

In your example app, I close the app AFTER I show the opverlay. Here my requirement is different. The app is already closed and I am trying to show the overlay.

from flutter_overlay_window.

Here is a sample app using Telephony plugin

main.dart

import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:flutter_overlay_window/flutter_overlay_window.dart';
import 'package:flutter_overlay_window_example/overlays/true_caller_overlay.dart';
import 'package:telephony/telephony.dart';

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

@pragma("vm:entry-point")
 void overlayMain() {
    WidgetsFlutterBinding.ensureInitialized();
    runApp(const MaterialApp(
    debugShowCheckedModeBanner: false,
    home: TrueCallerOverlay(),
 ));
}

void doPost(String msg) async {
     await FlutterOverlayWindow.showOverlay(
     height: 500,
     enableDrag: true,
     alignment: OverlayAlignment.center,
);
FlutterOverlayWindow.shareData(jsonEncode(msg));
}

 void onNewSmsBg(SmsMessage msg) {
       debugPrint("[CALL_HANDLER] on new sms bg ${msg.body}");
       doPost(msg.body ?? "");
  }

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

      @override
      State<MyApp> createState() => _MyAppState();
  }

  class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _smsHandlerPlugin = Telephony.instance;

  @override
  void initState() {
       super.initState();
       initPlatformState();
       initSmsHandler();
  }

Future<void> initSmsHandler() async {
var smsPerm = await _smsHandlerPlugin.requestPhoneAndSmsPermissions;
await FlutterOverlayWindow.requestPermission();
_smsHandlerPlugin.listenIncomingSms(
  onNewMessage: (msg) {
    debugPrint("on new sms fg ${msg.body}");
  },
 onBackgroundMessage: onNewSmsBg);
}

}

I have added Telephony as dependency in pubspec.yaml and added an entry for the OverlayService in my manifest file. Here the same issue. When the app is in foreground onNewMessage is called. When the app is minimized, onNewSmsBg is called and the overlay window is shown. But when I close my sample app, onNewSmsBg is called but I get the above exception and no overlay window is shown. I get the first error mentioned (no service while in background) if I don't modify the code as mentioned above. After the change, I get the second error.

Hope I have been able to show the issue. Thanks

from flutter_overlay_window.

i don't know if I get it but for me when I used the overlay package I used foreground_task flutter so even if I closed the app activity the overlay will not be killed cuz I have a running background task
clone this project and run it to check
foreground_app_test

from flutter_overlay_window.

Thanks for the reply. I will check it. The above link is not working

from flutter_overlay_window.

The above link is not working

https://github.com/X-SLAYER/foreground_app_test

from flutter_overlay_window.

The above link is not working

https://github.com/X-SLAYER/foreground_app_test

Are you refereing to https://github.com/X-SLAYER/foreground_plugins_test ? Because the above link is not working

from flutter_overlay_window.

The problem is that FlutterEngineCache does not hold a reference to a flutter engine with id OverlayConstants.CACHED_TAG once the app is closed.

from flutter_overlay_window.

i really don't know i will try to check it and get back to you

from flutter_overlay_window.

it's working fine for me just try this project I run the app background task then I closed the main activity after seconds the overlay has been launched from the background check it here
https://github.com/X-SLAYER/foreground_app_test/blob/main/lib/pages/first_task_handler.dart

from flutter_overlay_window.

I have figured out how to run the overlay in background, without using oreground_task flutter. As mentioned previously FlutterEngineCache does not hold a reference to a flutter engine with id OverlayConstants.CACHED_TAG once the app is closed. So in onCreate I am checking if cache already has a reference to the engine and if not create a new one. That seems to solve the problem. But now I have started a foreground service (the first error).

The link you have provided is not working. May be some network issue

.

from flutter_overlay_window.

i really don't know i will try to check it and get back to you

Sure. You can use my sample code to see the issue. The sample code uses Telephony plugin. When you close the app and a new SMS is received, it will raise the error.

from flutter_overlay_window.

mb repository was private now it's public

from flutter_overlay_window.

Thank you very much

from flutter_overlay_window.

Okay, I think the problem still persists. In your code you have started the foreground service and then you have closed tha app. In my case the app is already closed and I am trying to create the service. Again the cache does not hold a reference to the engine.

Please look into the sample I have provided. In the sample even if I start a foreground task, it's not working.

from flutter_overlay_window.

i don't have any idea about it it's not logic to start an activity while the app is closed even the engine will be killed so I think it's not posible

from flutter_overlay_window.

Consider the truecaller app. The app is not actively running all the time. Yet when a call arrives, it shows an overlay with the caller information. This might be a possible use case. Anyway, I am closing it.

from flutter_overlay_window.

Consider the truecaller app. The app is not actively running all the time. Yet when a call arrives, it shows an overlay with the caller information. This might be a possible use case. Anyway, I am closing it.

the truecaller app has a background service that works it's the same you can use workmanager or flutter_foreground_task plugins

from flutter_overlay_window.

I have the same or a similar issue.

the window overlay CAN be started from a background thread ( i use the plugin flutter_background_service) but only when the main activity was called before with the entrypoint

@pragma("vm:entry-point")
void overlayMain() {

but when the main activity got deleted by the system and the background service starts the window overlay i get the following error message:

Fatal Exception: java.lang.RuntimeException: Unable to create service flutter.overlay.window.flutter_overlay_window.OverlayService: java.lang.NullPointerException: Attempt to invoke virtual method 'io.flutter.embedding.engine.dart.DartExecutor io.flutter.embedding.engine.FlutterEngine.getDartExecutor()' on a null object reference

This can be reproduced by adding flutter_background_service to a window overlay project and activate "start on boot". then restart the device and the app crashes

Here the full error stacktrace:

Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'io.flutter.embedding.engine.dart.DartExecutor io.flutter.embedding.engine.FlutterEngine.getDartExecutor()' on a null object reference
       at flutter.overlay.window.flutter_overlay_window.OverlayService.<init>(OverlayService.java:37)
       at java.lang.Class.newInstance(Class.java)
       at android.app.AppComponentFactory.instantiateService(AppComponentFactory.java:129)
       at androidx.core.app.CoreComponentFactory.instantiateService(CoreComponentFactory.java:75)
       at android.app.ActivityThread.handleCreateService(ActivityThread.java:4370)
       at android.app.ActivityThread.access$1900(ActivityThread.java:274)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2112)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loop(Looper.java:233)
       at android.app.ActivityThread.main(ActivityThread.java:8010)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:631)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:978)

from flutter_overlay_window.