This Docker image contains the Android SDK and most common packages necessary for building Android apps in a CI tool like GitLab CI. Make sure your CI environment's caching works as expected, this greatly improves the build time, especially if you use multiple build jobs.
A .gitlab-ci.yml with caching of your project's dependencies would look like this:
image: gitlab-ci_android
stages:
- build
before_script:
- export GRADLE_USER_HOME=$(pwd)/.gradle
- chmod +x ./gradlew
cache:
key: ${CI_PROJECT_ID}
paths:
- .gradle/
build:
stage: build
script:
- ./gradlew assembleDebug
artifacts:
paths:
- app/build/outputs/apk/app-debug.apk