Not working in FirebaseMessaging onBackgroundMessage

[lucky-lusa]

Hi,

when I try to use the device calendar in an isolate like onBackgroundMessage

I get an error

PlatformException(error, lateinit property _calendarDelegate has not been initialized, null, kotlin.UninitializedPropertyAccessException: lateinit property _calendarDelegate has not been initialized

Any hint what I am doing wrong?

Flutter doctor output:

[✓] Flutter (Channel stable, 3.0.5, on macOS 12.4 21F79 darwin-x64, locale de-DE)
    • Flutter version 3.0.5 at /Users/tim/development/tools/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision f1875d570e (6 days ago), 2022-07-13 11:24:16 -0700
    • Engine revision e85ea0e79c
    • Dart version 2.17.6
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[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0-rc1)
    • Android SDK at /Users/tim/Library/Android/sdk
    • Platform android-32, build-tools 32.0.0-rc1
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)
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    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)

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[✓] Connected device (4 available)
    • SM A226B (mobile)                  • R9WT4129BFJ   • android-arm64  • Android 11 (API 30)
    • Android SDK built for x86 (mobile) • emulator-5554 • android-x86    • Android 10 (API 29) (emulator)
    • macOS (desktop)                    • macos         • darwin-x64     • macOS 12.4 21F79 darwin-x64
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• No issues found!

[lucky-lusa]

I think I found a fix for that. Please see pull request #431

[thomassth]

@lucky-lusa can you verify that it fixes your problem?

Better yet, can you share how did you trigger the bug? So we might be able to write it into example, and perhaps write test for it.

[Musta-Pollo]

I am using the last version on the develop branch. But without luck using it in the isolate with this fix.

[MichaelTamm]

I have the same problem:

E/MethodChannel#plugins.builttoroam.com/device_calendar(28662): Failed to handle method call
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662): kotlin.UninitializedPropertyAccessException: lateinit property _calendarDelegate has not been initialized
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at com.builttoroam.devicecalendar.DeviceCalendarPlugin.onMethodCall(DeviceCalendarPlugin.kt:115)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:262)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at android.os.Handler.handleCallback(Handler.java:789)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at android.os.Handler.dispatchMessage(Handler.java:98)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at android.os.Looper.loop(Looper.java:164)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at android.app.ActivityThread.main(ActivityThread.java:6944)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
E/MethodChannel#plugins.builttoroam.com/device_calendar(28662):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)