No working audio_service and firebase_messaging together

[galszabolcs]

Hello!

In my project audio_service and firebase_messaging not working together.

Error message is:

E/flutter ( 5794): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(error, Attempt to invoke virtual method 'void com.ryanheise.audioservice.AudioServicePlugin$BackgroundHandler.init(io.flutter.plugin.common.PluginRegistry$Registrar)' on a null object reference, null) E/flutter ( 5794): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569:7) E/flutter ( 5794): #1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:321:33) E/flutter ( 5794): <asynchronous suspension> E/flutter ( 5794): #2 FirebaseMessaging.configure (package:firebase_messaging/firebase_messaging.dart:118:16) E/flutter ( 5794): #4 StatefulElement.build (package:flutter/src/widgets/framework.dart:4334:27) E/flutter ( 5794): #5 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4223:15) E/flutter ( 5794): #6 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter ( 5794): #7 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5) E/flutter ( 5794): #8 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4381:11) E/flutter ( 5794): #9 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5) E/flutter ( 5794): #10 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) E/flutter ( 5794): #11 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) E/flutter ( 5794): #12 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5445:14) E/flutter ( 5794): #13 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) E/flutter ( 5794): #14 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) E/flutter ( 5794): #15 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) E/flutter ( 5794): #16 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter ( 5794): #17 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5) E/flutter ( 5794): #18 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5) E/flutter ( 5794): #19 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) E/flutter ( 5794): #20 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) E/flutter ( 5794): #21 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5445:14) E/flutter ( 5794): #22 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) E/flutter ( 5794): #23 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) E/flutter ( 5794): #24 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5445:14) E/flutter ( 5794): #25 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) E/flutter ( 5794): #26 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) E/flutter ( 5794): #27 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) E/flutter ( 5794): #28 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter ( 5794): #29 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5) E/flutter ( 5794): #30 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4381:11) E/flutter ( 5794): #31 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5) E/flutter ( 5794): #32 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) E/flutter ( 5794): #33 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) E/flutter ( 5794): #34 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5445:14) E/flutter ( 5794): #35 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) E/flutter ( 5794): #36 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) E/flutter ( 5794): #37 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5445:14) E/flutter ( 5794): #38 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14) E/flutter ( 5794): #39 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12) E/flutter ( 5794): #40 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16) E/flutter ( 5794): #41 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5) E/flutter ( 5794): #42 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5) E/flutter ( 5794): #43 StatefulElement._firs E/flutter ( 5794): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method FcmDartService#initialized on channel plugins.flutter.io/firebase_messaging_background) E/flutter ( 5794): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:319:7) E/flutter ( 5794): <asynchronous suspension> E/flutter ( 5794): #1 _fcmSetupBackgroundChannel (package:firebase_messaging/firebase_messaging.dart:50:21) E/flutter ( 5794): #2 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:45:6) E/flutter ( 5794): #3 _fcmSetupBackgroundChannel (package:firebase_messaging/firebase_messaging.dart:23:32) E/flutter ( 5794): #4 _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:239:25) E/flutter ( 5794): #5 _rootRun (dart:async/zone.dart:1126:13) E/flutter ( 5794): #6 _CustomZone.run (dart:async/zone.dart:1023:19) E/flutter ( 5794): #7 _runZoned (dart:async/zone.dart:1518:10) E/flutter ( 5794): #8 runZoned (dart:async/zone.dart:1502:12) E/flutter ( 5794): #9 _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:231:5) E/flutter ( 5794): #10 _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:307:19) E/flutter ( 5794): #11 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)

Someone has any idea about this error?

Thanks!

[amugofjava]

I have the same problem when using the flutter_downloader plugin. The issue seems to occur if any other plugin is used (registered) before start is called on audio_service. I believe this is because backgroundHandler.init within AudioServicePlugin.java is called at the point of registration, but backgroundHandler is null until start is called on audio_service.

If I start playback before I use the flutter_downloader plugin all is fine.

[ryanheise]

Hi @galszabolcs , is this still an issue for you with the latest plugin versions and Flutter? If so, it would be useful to provide a minimal reproduction project.

Note that since you wrote this issue, audio_service has been updated to use the new v2 plugin model, but firebase_messaging has not. See my comment on that project (firebase/flutterfire#1754 (comment)) for how to get firebase_messaging working under v2. As for whether these two plugins will work together under v2, let me know if it doesn't work, along with a small minimal reproduction project and I can investigate it. (If it's no longer an issue, I'll close this issue.)

[ryanheise]

Closing due to inactivity. If anyone else has this issue with the latest version on git, please open a new issue with a minimal reproduction project.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs, or use StackOverflow if you need help with audio_service.