Getting error when running the mi_card_flutter code.

[hayyann]

I'm getting the following error.

Launching lib\main.dart on AOSP on IA Emulator in debug mode...
[!] 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 'assembleDebug'...

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:processDebugResources'.

Android resource linking failed
Output: C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:186: error: resource android:attr/fontVariationSettings not found.
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:187: error: resource android:attr/ttcIndex not found.
error: failed linking references.

Command: C:\Users\hayya.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\8795c7c7149d9230db0423e079c95a4d\aapt2-3.2.1-4818971-windows\aapt2.exe link -I
C:\Users\hayya\AppData\Local\Android\sdk\platforms\android-27\android.jar
--manifest
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml
-o
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_
-R
@C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt
--auto-add-overlay
--java
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r
--custom-package
co.appbrewery.micard
-0
apk
--output-text-symbols
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\symbols\debug\R.txt
--no-version-vectors
Daemon: AAPT2 aapt2-3.2.1-4818971-windows Daemon #0
Output: C:\Users\hayya.gradle\caches\transforms-1\files-1.1\support-compat-28.0.0.aar\8785b1333ccfee40180d9ac1d1a63e1a\res\values\values.xml:89:5-125:25: AAPT: error: resource android:attr/fontVariationSettings not found.

C:\Users\hayya.gradle\caches\transforms-1\files-1.1\support-compat-28.0.0.aar\8785b1333ccfee40180d9ac1d1a63e1a\res\values\values.xml:89:5-125:25: AAPT: error: resource android:attr/ttcIndex not found.

error: failed linking references.
Command: C:\Users\hayya.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\8795c7c7149d9230db0423e079c95a4d\aapt2-3.2.1-4818971-windows\aapt2.exe link -I
C:\Users\hayya\AppData\Local\Android\sdk\platforms\android-27\android.jar
--manifest
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml
-o
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_
-R
@C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt
--auto-add-overlay
--java
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r
--custom-package
co.appbrewery.micard
-0
apk
--output-text-symbols
C:\Users\hayya\AndroidStudioProjects\mi_card_flutter\build\app\intermediates\symbols\debug\R.txt
--no-version-vectors
Daemon: AAPT2 aapt2-3.2.1-4818971-windows 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

BUILD FAILED in 1s
Finished with error: Gradle task assembleDebug failed with exit code 1

[Lvka]

If you bump your compileSdkVersion from 27 to 28 in build.gradle you'll be able to build it successfully.

[TheMuellenator]

Just updated the stub. Bumped up the SDK and gradle versions.
Hope this fixes the issue. Let me know if the problems persist.