Building flutter release android app failed

Question

I recently started building flutter apps and just finished my first project, a google play like app store using firebase, it works fine in debug mode but when I tried to build a release apk it fails with: firebase_analytics:verifyReleaseResources message.

I tried changing the firebase dependencies in the pubspec.yaml to ones before AndroidX and also tried running flutter clean but nothing worked.

Here are my dependencies

dependencies:
  flutter:
    sdk: flutter

  firebase_core: ^0.3.0

  firebase_analytics: ^1.1.0

  firebase_storage: ^2.1.1+2

  firebase_database: ^1.0.5
  store_redirect: ^1.0.1

  cloud_firestore: ^0.9.8

  firebase_auth: ^0.9.0
  google_sign_in: ^3.2.4

  rxdart: 0.20.0

  cupertino_icons: ^0.1.2
  font_awesome_flutter: ^8.2.0
  carousel_slider: ^1.3.0

And here is the error I get when I run flutter run --release

Initializing gradle...                                              1.3s

Resolving dependencies...                                           4.6s

Launching lib\main.dart on TECNO CX Air in release mode...

registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)

registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)

registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':firebase_analytics:verifyReleaseResources'.
> java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource linking failed
  C:\Projects\flutterExcersice\NestedTabs-master\flutternestedtabsapp\build\firebase_analytics\intermediates\res\merged\release\values\values.xml:276: error: resource android:attr/fontVariationSettings not found.
  C:\Projects\flutterExcersice\NestedTabs-master\flutternestedtabsapp\build\firebase_analytics\intermediates\res\merged\release\values\values.xml:277: error: resource android:attr/ttcIndex not found.
  error: failed linking references.


* Try:
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* Get more help at https://help.gradle.org

BUILD FAILED in 22s

Running Gradle task 'assembleRelease'...

Running Gradle task 'assembleRelease'... Done                      23.5s

Gradle task assembleRelease failed with exit code 1

Answer 1

A bit late reply, but posting it for future users.

I also faced same error. That too in release build, debug build is working fine.

After updating all the firebase and google libraries, it started working. I updated all these libraries:-

• firebase_core: ^0.4.2
• firebase_analytics: ^5.0.6
• firebase_auth: ^0.15.0+1
• cloud_firestore: ^0.12.10+2
• firebase_messaging: ^6.0.1
• google_sign_in: ^4.0.14