Flutter Firebase Messaging Crashing Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE

Question

Recently we released android application targets to 31 which has reported more crashes (only Android OS 12 users) in Firebase Messaging (PendingIntent). When Application is in Pause/Background state on Notification Receive its crashing. I've tried possible solutions but no luck still crashing. As i understood is we have to add PendingIntent.FLAG_IMMUTABLE on PendingIntent start activity but not getting any idea how to add or fix this.

If anyone faced same issue and fixed. Share solution for this.

Thanks in advance...

dependencies{
    implementation platform('com.google.firebase:firebase-bom')
    implementation 'com.google.firebase:firebase-messaging'
    implementation 'com.google.firebase:firebase-iid'
    implementation 'com.google.firebase:firebase-analytics:17.4.4'
    implementation 'com.google.firebase:firebase-crashlytics:17.0.0'
}

E/AndroidRuntime( 7058): java.lang.IllegalArgumentException: com.package: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
E/AndroidRuntime( 7058): 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.
E/AndroidRuntime( 7058):    at android.app.PendingIntent.checkFlags(PendingIntent.java:375)
E/AndroidRuntime( 7058):    at android.app.PendingIntent.getActivityAsUser(PendingIntent.java:458)
E/AndroidRuntime( 7058):    at android.app.PendingIntent.getActivity(PendingIntent.java:444)
E/AndroidRuntime( 7058):    at android.app.PendingIntent.getActivity(PendingIntent.java:408)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.CommonNotificationBuilder.createContentIntent(com.google.firebase:firebase-messaging@@20.3.0:125)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.CommonNotificationBuilder.createNotificationInfo(com.google.firebase:firebase-messaging@@20.3.0:27)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.CommonNotificationBuilder.createNotificationInfo(com.google.firebase:firebase-messaging@@20.3.0:9)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.DisplayNotification.handleNotification(com.google.firebase:firebase-messaging@@20.3.0:27)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.FirebaseMessagingService.dispatchMessage(com.google.firebase:firebase-messaging@@20.3.0:65)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.FirebaseMessagingService.passMessageIntentToSdk(com.google.firebase:firebase-messaging@@20.3.0:44)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.FirebaseMessagingService.handleMessageIntent(com.google.firebase:firebase-messaging@@20.3.0:27)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.FirebaseMessagingService.handleIntent(com.google.firebase:firebase-messaging@@20.3.0:17)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.EnhancedIntentService.lambda$processIntent$0$EnhancedIntentService(com.google.firebase:firebase-messaging@@20.3.0:43)
E/AndroidRuntime( 7058):    at com.google.firebase.messaging.EnhancedIntentService$$Lambda$0.run(Unknown Source:6)
E/AndroidRuntime( 7058):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/AndroidRuntime( 7058):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/AndroidRuntime( 7058):    at com.google.android.gms.common.util.concurrent.zza.run(com.google.android.gms:play-services-basement@@17.6.0:2)
E/AndroidRuntime( 7058):    at java.lang.Thread.run(Thread.java:920)
W/CrashlyticsCore( 7058): Cannot send reports. Settings are unavailable.
D/TransportRuntime.SQLiteEventStore( 7058): Storing event with priority=HIGHEST, name=FIREBASE_CRASHLYTICS_REPORT for destination cct

Answer 1

I resolved this finally. Its crashed due to lower version of Firebase Plugins and after upgrading the Android Dependencies and Flutter plugins it got resolved.

Step 1: In android/app/build.gradle

From

implementation 'com.google.firebase:firebase-messaging:20.1.5'

To

implementation platform('com.google.firebase:firebase-bom') // add this 
implementation 'com.google.firebase:firebase-messaging:23.0.0'
implementation 'com.google.firebase:firebase-iid:21.1.0' // add this

Step 2: In Flutter pubspec.yaml

From

firebase_core: ^0.5.0+1
firebase_messaging: ^7.0.3
firebase_remote_config: ^0.4.2
firebase_crashlytics: ^0.1.4+1
firebase_dynamic_links: ^0.6.3
firebase_auth: ^0.18.4+1

To

firebase_core: ^1.10.0
firebase_messaging: ^11.2.6
firebase_remote_config: ^2.0.0
firebase_crashlytics: ^2.5.0
firebase_dynamic_links: ^4.0.5
firebase_auth: ^3.3.6

Answer 2

As per the official doc "If your app targets Android 12, you must specify the mutability of each PendingIntent object that your app creates. This additional requirement improves your app's security."

Intent notificationIntent = new Intent(getApplicationContext(), MainActivity.class);

   
PendingIntent contentIntent = PendingIntent.getActivity(context,NOTIFICATION_REQUEST_CODE, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);

we’re constructing a standard type of Intent that will open our app, and then simply wrapping that in a PendingIntent before adding it to our notification.In this case, since we have an exact action we know we want to perform, we construct a PendingIntent that cannot be modified by the app we pass it to by utilizing a flag called FLAG_IMMUTABLE.

Answer 3

update com.google.firebase:firebase-messaging:

From

implementation 'com.google.firebase:firebase-messaging:20.1.5'

To

implementation 'com.google.firebase:firebase-messaging:23.0.0'  
implementation 'com.google.firebase:firebase-iid:21.1.0' 

and sync project with Gradle Files