Push notifications causing a crash when targeting Android API 31+

I am using the latest Backendless SDK v6.3.4 and targeting Android SDK 31. When the device receives a push notification message the following crash happens:

E/BackendlessFCMService: Error processing push notification
java.lang.IllegalArgumentException: org.helpapaw.helpapaw: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.
at android.app.PendingIntent.checkFlags(PendingIntent.java:382)
at android.app.PendingIntent.getActivityAsUser(PendingIntent.java:465)
at android.app.PendingIntent.getActivity(PendingIntent.java:451)
at android.app.PendingIntent.getActivity(PendingIntent.java:415)
at com.backendless.push.BackendlessFCMService.fallBackMode(BackendlessFCMService.java:181)
at com.backendless.push.BackendlessFCMService.handleMessage(BackendlessFCMService.java:113)
at com.backendless.push.BackendlessFCMService.onMessageReceived(BackendlessFCMService.java:68)
at com.google.firebase.messaging.FirebaseMessagingService.dispatchMessage(com.google.firebase:firebase-messaging@@21.1.0:13)
at com.google.firebase.messaging.FirebaseMessagingService.passMessageIntentToSdk(com.google.firebase:firebase-messaging@@21.1.0:8)
at com.google.firebase.messaging.FirebaseMessagingService.handleMessageIntent(com.google.firebase:firebase-messaging@@21.1.0:3)
at com.google.firebase.messaging.FirebaseMessagingService.handleIntent(com.google.firebase:firebase-messaging@@21.1.0:3)
at com.google.firebase.messaging.EnhancedIntentService.lambda$processIntent$0$EnhancedIntentService(com.google.firebase:firebase-messaging@@21.1.0:1)
at com.google.firebase.messaging.EnhancedIntentService$$Lambda$0.run(Unknown Source:6)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at com.google.android.gms.common.util.concurrent.zza.run(com.google.android.gms:play-services-basement@@18.0.0:2)
at java.lang.Thread.run(Thread.java:920)

As the crash message says - PendingIntents on Android 31+ should have a mutability flag. The fix is rather easy - just add FLAG_IMMUTABLE in BackendlessFCMService.java:181
Hope this fill be fixed very soon!

Hi @milen-marinov

Thank you for discovering this problem, this will definitely make Backendless better.
I’ve created an internal ticket BKNDLSS-28122 to investigate this problem.


hello @milen-marinov

currently, backendless fully support API 28. We are on task to add support 29+. For API 29+ you can use push notifications, but in this case, you should create your own FirebaseMessagingService implementation.

Hello @sergey.kuk ,

Thanks for the clarification! Please let me know when the SDK with support for API 29+ is released. Also, is there any customization that shoud be made in the FirebaseMessagingService implementation and is it documented?

The internal ticket for the task is BKNDLSS-28887, we will notify you as soon as it will be implemented.

It is not documented but you just override onMessageReceived method, so just as standard google cloud messaging implementation

1 Like

Hi @milen-marinov ,

We released new version of Android SDK (6.3.6) in which this problem was fixed. Could you please check and confirm that problem is not longer reproduced in your app?

Regards, Andriy

Looks like it is. Thanks!