The app doesn't compile

[Ascenio]

Warning
──────────────────────────────────────────────────────────────────────────────
Your Flutter application is created using an older version of the Android
embedding. It's being deprecated in favor of Android embedding v2. Follow the
steps at

https://flutter.dev/go/android-project-migration

to migrate your project.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

You are building a fat APK that includes binaries for android-arm, android-arm64, android-x64.
If you are deploying the app to the Play Store, it's recommended to use app bundles or split the APK to reduce the APK size.
    To generate an app bundle, run:
        flutter build appbundle --target-platform android-arm,android-arm64,android-x64
        Learn more on: https://developer.android.com/guide/app-bundle
    To split the APKs per ABI, run:
        flutter build apk --target-platform android-arm,android-arm64,android-x64 --split-per-abi
        Learn more on:  https://developer.android.com/studio/build/configure-apk-splits#configure-abi-split
[!] Your app isn't using AndroidX.
    To avoid potential build failures, you can quickly migrate your app by following the steps on https://goo.gl/CP92wY .
Running Gradle task 'assembleRelease'...                        


Welcome to Gradle 4.10.2!



Here are the highlights of this release:

 - Incremental Java compilation by default

 - Periodic Gradle caches cleanup

 - Gradle Kotlin DSL 1.0-RC6

 - Nested included builds

 - SNAPSHOT plugin versions in the `plugins {}` block



For more details see https://docs.gradle.org/4.10.2/release-notes.html






FAILURE: Build failed with an exception.



* What went wrong:

Execution failed for task ':app:processReleaseResources'.

> Android resource linking failed

  Output:  /Users/builder/clone/build/app/intermediates/incremental/mergeReleaseResources/merged.dir/values/values.xml:86: error: resource android:attr/fontVariationSettings not found.

  /Users/builder/clone/build/app/intermediates/incremental/mergeReleaseResources/merged.dir/values/values.xml:87: error: resource android:attr/ttcIndex not found.

  error: failed linking references.



  Command: /Users/builder/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/240b6c832eca7924d551bf6ba542dcbe/aapt2-3.2.1-4818971-osx/aapt2 link -I\

          /Users/builder/programs/android-sdk-macosx/platforms/android-27/android.jar\

          --manifest\

          /Users/builder/clone/build/app/intermediates/merged_manifests/release/processReleaseManifest/merged/AndroidManifest.xml\

          -o\

          /Users/builder/clone/build/app/intermediates/processed_res/release/processReleaseResources/out/resources-release.ap_\

          -R\

          @/Users/builder/clone/build/app/intermediates/incremental/processReleaseResources/resources-list-for-resources-release.ap_.txt\

          --auto-add-overlay\

          --java\

          /Users/builder/clone/build/app/generated/not_namespaced_r_class_sources/release/processReleaseResources/r\

          --proguard\

          /Users/builder/clone/build/app/intermediates/proguard-rules/release/aapt_rules.txt\

          --custom-package\

          dev.flutter.devrpg\

          -0\

          apk\

          --output-text-symbols\

          /Users/builder/clone/build/app/intermediates/symbols/release/R.txt\

          --no-version-vectors

  Daemon:  AAPT2 aapt2-3.2.1-4818971-osx Daemon #0

  Output:  /Users/builder/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/6420b02a8ec7479a3d9f57c4e19a6396/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/fontVariationSettings not found.



  /Users/builder/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/6420b02a8ec7479a3d9f57c4e19a6396/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/ttcIndex not found.



  error: failed linking references.

  Command: /Users/builder/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/240b6c832eca7924d551bf6ba542dcbe/aapt2-3.2.1-4818971-osx/aapt2 link -I\

          /Users/builder/programs/android-sdk-macosx/platforms/android-27/android.jar\

          --manifest\

          /Users/builder/clone/build/app/intermediates/merged_manifests/release/processReleaseManifest/merged/AndroidManifest.xml\

          -o\

          /Users/builder/clone/build/app/intermediates/processed_res/release/processReleaseResources/out/resources-release.ap_\

          -R\

          @/Users/builder/clone/build/app/intermediates/incremental/processReleaseResources/resources-list-for-resources-release.ap_.txt\

          --auto-add-overlay\

          --java\

          /Users/builder/clone/build/app/generated/not_namespaced_r_class_sources/release/processReleaseResources/r\

          --proguard\

          /Users/builder/clone/build/app/intermediates/proguard-rules/release/aapt_rules.txt\

          --custom-package\

          dev.flutter.devrpg\

          -0\

          apk\

          --output-text-symbols\

          /Users/builder/clone/build/app/intermediates/symbols/release/R.txt\

          --no-version-vectors

  Daemon:  AAPT2 aapt2-3.2.1-4818971-osx Daemon #0



* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.



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

[Andres-MI]

Hi Ascenio, I've solved this same error upgrading compilesdkVersion on Android build.gradle to 29 (any >27 should do the trick)

I have opened PR #159 in order to solve this: