Gitlab CI with Android NDK

I am trying to implement gitlab CI in my android project. I have configured the .gitlab-ci.yml following official documentation. This is how my .gitlab-ci.yml looks like,

image: openjdk:8-jdk
    variables:
  ANDROID_COMPILE_SDK: "29"
  ANDROID_BUILD_TOOLS: "28.0.3"
  ANDROID_SDK_TOOLS:   "4333796"

before_script:
  - apt-get --quiet update --yes
  - apt-get --quiet install --yes wget tar unzip lib32stdc++6 lib32z1
  - wget --quiet --output-document=android-sdk.zip https://dl.google.com/android/repository/sdk-tools-linux-${ANDROID_SDK_TOOLS}.zip
  - unzip -d android-sdk-linux android-sdk.zip
  - echo y | android-sdk-linux/tools/bin/sdkmanager "platforms;android-${ANDROID_COMPILE_SDK}" >/dev/null
  - echo y | android-sdk-linux/tools/bin/sdkmanager "platform-tools" >/dev/null
  - echo y | android-sdk-linux/tools/bin/sdkmanager "build-tools;${ANDROID_BUILD_TOOLS}" >/dev/null
  - export ANDROID_HOME=$PWD/android-sdk-linux
  - export ANDROID_NDK_HOME=${ANDROID_HOME}/ndk/22.0.7026061/
  - export PATH=$PATH:$PWD/android-sdk-linux/platform-tools/
  - echo "sdk.dir=${ANDROID_HOME}" >> local.properties
  - echo "ndk.dir=${ANDROID_NDK_HOME}" >> local.properties
  - chmod +x ./gradlew
  - set +o pipefail
  - yes | android-sdk-linux/tools/bin/sdkmanager --licenses
  - set -o pipefail

stages:
  - build
  - test

assembleDebug:
  stage: build
  script:
    - ./gradlew assembleDebug
  artifacts:
    paths:
      - app/build/outputs/apk/debug/

debugTests:
  stage: test
  script:
    - ./gradlew -Pci --console=plain :app:testDebug
`

but it seems to failing all the time with the exception

* What went wrong:
A problem occurred configuring project ':app'.
java.lang.NullPointerException (no error message) 

Also, I get warning,

"Install NDK (revision: 22.0.7026061)" complete.
"Install NDK (revision: 22.0.7026061)" finished.
NDK is missing a "platforms" directory.
If you are using NDK, verify the ndk.dir is set to a valid NDK directory.  It is currently set to 
 /builds/muhammad.asad2/asad-gitlab-cicd/android-sdk-linux/ndk-bundle.
If you are not using NDK, unset the NDK variable from ANDROID_NDK_HOME or local.properties to 
remove this warning.

Any help or guidance would be highly appreciated, also, if any link to a sample .gitlab-ci.yml which has NDK configured would be great.

This may (or may not) help. One of my projects uses Android NDK. Here is my script for setting stuff up.

image921×672 20.1 KB

This is the .gitlab-ci.yml part that calls the script and builds my project.

Yes. The SDK tools and NDK versions are old. Don’t judge me

can you provide the link of the config?