Showing "Background Service Preparing" in APK Build While Working In Debug Mode Perfectly

[EXEIdeas]

I am making an App where I will get a Hit from Background Service each after 5 Seconds for that my background service file is shared as below...

• flutter_background_service: ^2.4.5
• Flutter SDK: v3.3.7 Stable Release

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_background_service/flutter_background_service.dart';
import 'package:flutter_background_service_android/flutter_background_service_android.dart';

const String actionRunningProgress = 'runningProgress';
const String actionStartRunning = 'startRunning';

Future<void> initializeService() async {
  await service.configure(
    androidConfiguration: AndroidConfiguration(
      onStart: onStart,
      autoStart: true,
      isForegroundMode: true,
    ),
    iosConfiguration: IosConfiguration(
      autoStart: true,
      onForeground: onStart,
      onBackground: onIosBackground,
    ),
  );
}

void onStart(ServiceInstance service) {
  WidgetsFlutterBinding.ensureInitialized();

  if (service is AndroidServiceInstance) {
    service.setAsForegroundService();
    service.on('setAsForeground').listen((event) {
      service.setAsForegroundService();
    });
    service.on('setAsBackground').listen((event) {
      service.setAsBackgroundService();
    });
    service.on('stopService').listen((event) {
      service.stopSelf();
    });

    service.on(actionRunningProgress).listen((event) {
      print("Update Run Called In Backend");
    });

    service.on(actionStartRunning).listen((event) {
      int sec = 0;
      Timer timer = Timer.periodic(const Duration(seconds: 1), (timer) {
        sec++;
        service.setForegroundNotificationInfo(
          title: "Running in Progress",
          content: "Time Spent (seconds): $sec",
        );
        if (sec % 5 == 0) {
          //print("Background Hit Sent At Every 5 Sec");
          service.invoke(actionRunningProgress);
        }
      });
    });
  }
}

bool onIosBackground(ServiceInstance service) {
  WidgetsFlutterBinding.ensureInitialized();
  print('FLUTTER BACKGROUND FETCH');
  return true;
}

@override
void dispose() {
  // Remove/Dispose
}

And I am started the service in main.dart as follows

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await initializeService();
  runApp(const MyApp());
}

And calling Service in main home.dart as follows

void initState() {
    // TODO: implement initState
   service.startService().then((value) {
      // Run BG Service Start
     service.invoke(actionStartRunning);

      // Receive Data At Foreground
     service .on(actionRunningProgress).listen((event) {
        print("Update Run Called In Frontend");
      });
    });
    super.initState();
  }

Now the problem is that everything is working until I connect my Device via Cable and Run but when I build APK then it is just showing "Background Service Preparing" in notification only.

This is completely a new project so I didn't connect it with any other service like Google, SigningKey, etc

Here is the more info...

flutter doctor --verbose
[✓] Flutter (Channel stable, 3.3.7, on macOS 13.0.1 22A400 darwin-arm, locale en-GB)
    • Flutter version 3.3.7 on channel stable at /Users/myusername/AndroidStudioProjects/flutter_v3.3.7
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision e99c9c7cd9 (4 weeks ago), 2022-11-01 16:59:00 -0700
    • Engine revision 857bd6b74c
    • Dart version 2.18.4
    • DevTools version 2.15.0

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    • Android SDK at /Users/myusername/Library/Android/sdk
    • Platform android-33, build-tools 33.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 13C100
    • CocoaPods version 1.11.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)

[✓] Connected device (2 available)
    • macOS (desktop) • macos  • darwin-arm64   • macOS 13.0.1 22A400 darwin-arm
    • Chrome (web)    • chrome • web-javascript • Google Chrome 108.0.5359.71

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!
Process finished with exit code 0

[aqsakhan22]

See the FAQs on https://pub.dev/packages/flutter_background_service
Service not running in Release Mode #
Add @pragma('vm:entry-point') to the onStart() method. Example:

@pragma('vm:entry-point')
void onStart(ServiceInstance service){
  ...
}

[EXEIdeas]

Thanks... Its Working...

[MoeezChohan1089]

hy sir,
Hope you are doing well i am using this pluggin but i am facing same problem that
in debug mode working perfect but in release mode not work it is showing error:

_runMain. (dart:ui/hooks.dart:129)
E/flutter ( 9887): #8 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:297)
E/flutter ( 9887): #9 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:192)
E/flutter ( 9887): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: NoSuchMethodError: No top-level
getter 'onStart1' declared.
E/flutter ( 9887): Receiver: top-level
E/flutter ( 9887): Tried calling: onStart1
E/flutter ( 9887): #0 NoSuchMethodError._throwNew (dart:core-patch/errors_patch.dart:225)
E/flutter ( 9887): #1 FfiTrampoline___getCallbackFromHandle$Method$FfiNative$Ptr (dart:ffi)
E/flutter ( 9887): #2 _getCallbackFromHandle (dart:ui/natives.dart:141)
E/flutter ( 9887): #3 PluginUtilities.getCallbackFromHandle. (dart:ui/plugins.dart:81)
E/flutter ( 9887): #4 _LinkedHashMapMixin.putIfAbsent (dart:collection-patch/compact_hash.dart:535)
E/flutter ( 9887): #5 PluginUtilities.getCallbackFromHandle (dart:ui/plugins.dart:80)
E/flutter ( 9887): #6 entrypoint (package:flutter_background_service_android/flutter_background_service_android.dart:1
6)
E/flutter ( 9887): #7 _runMain. (dart:ui/hooks.dart:129)
E/flutter ( 9887): #8 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:297)
E/flutter ( 9887): #9 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:192)

flutter_background_service: ^2.2.2

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.7.12, on Microsoft Windows [Version 10.0.19045.3086], locale en-PK)
[√] Windows Version (Installed version of Windows is version 10 or higher)

how to solve this issue please tell me

[EXEIdeas]

hy sir, Hope you are doing well i am using this pluggin but i am facing same problem that in debug mode working perfect but in release mode not work it is showing error:

_runMain. (dart:ui/hooks.dart:129) E/flutter ( 9887): #8 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:297) E/flutter ( 9887): #9 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:192) E/flutter ( 9887): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: NoSuchMethodError: No top-level getter 'onStart1' declared. E/flutter ( 9887): Receiver: top-level E/flutter ( 9887): Tried calling: onStart1 E/flutter ( 9887): #0 NoSuchMethodError._throwNew (dart:core-patch/errors_patch.dart:225) E/flutter ( 9887): #1 FfiTrampoline___getCallbackFromHandle$Method$FfiNative$Ptr (dart:ffi) E/flutter ( 9887): #2 _getCallbackFromHandle (dart:ui/natives.dart:141) E/flutter ( 9887): #3 PluginUtilities.getCallbackFromHandle. (dart:ui/plugins.dart:81) E/flutter ( 9887): #4 _LinkedHashMapMixin.putIfAbsent (dart:collection-patch/compact_hash.dart:535) E/flutter ( 9887): #5 PluginUtilities.getCallbackFromHandle (dart:ui/plugins.dart:80) E/flutter ( 9887): #6 entrypoint (package:flutter_background_service_android/flutter_background_service_android.dart:1 6) E/flutter ( 9887): #7 _runMain. (dart:ui/hooks.dart:129) E/flutter ( 9887): #8 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:297) E/flutter ( 9887): #9 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:192)

flutter_background_service: ^2.2.2

Doctor summary (to see all details, run flutter doctor -v): [√] Flutter (Channel stable, 3.7.12, on Microsoft Windows [Version 10.0.19045.3086], locale en-PK) [√] Windows Version (Installed version of Windows is version 10 or higher)

how to solve this issue please tell me

Please follow this. #258 (comment)