Failure to build on Android when host app includes [firebase_core] and [firebase_messaging] dependencies

[MuhammadEssam96]

🐛 card_flutter fails to build on Android when host app includes firebase_core and firebase_messaging

Description

When integrating card_flutter into a Flutter app that uses firebase_core and firebase_messaging, the Android build fails due to a duplicate class error.

The error also occurs when building the bundled example app after adding these Firebase dependencies.

---

Steps to Reproduce

1. Create a new Flutter app or use the provided example app in card_flutter.
2. Add the following dependencies to pubspec.yaml:

   dependencies:
     firebase_core: ^2.30.0
     firebase_messaging: ^14.7.10

3. Run flutter pub get.
4. Build the app for Android:

   flutter build apk --flavor qa --debug

---

Actual Result

Build fails with the following error:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkQaReleaseDuplicateClasses'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
   > Duplicate class com.google.firebase.iid.FirebaseInstanceIdReceiver found in modules firebase-iid-20.1.5.aar (com.google.firebase:firebase-iid:20.1.5) 
     and firebase-messaging-24.1.1.aar (com.google.firebase:firebase-messaging:24.1.1)

     Learn how to fix dependency resolution errors at https://d.android.com/r/tools/classpath-sync-errors

---

Expected Result

The app should build successfully with card_flutter, firebase_core, and firebase_messaging dependencies included.

---

Notes

• The issue appears to be caused by an outdated or conflicting transitive Firebase dependency.
• A resolution strategy or exclusion rule might be needed in card_flutter's build.gradle to avoid pulling in deprecated Firebase libraries (like firebase-iid).

---

Please look into resolving this compatibility issue or provide guidance on an official workaround.

[benyameen10]

have you found any solution..?

[benyameen10]

@MuhammadEssam96

configurations.all {
    // exclude group: 'com.google.firebase', module: 'firebase-iid'
    resolutionStrategy.eachDependency { d ->
        if (d.requested.group == 'com.google.firebase' &&
            d.requested.name  == 'firebase-iid') {
            d.useVersion '21.1.0'         // keep one modern copy instead
        }
    }
}

add this code in you android/app/build.gradle