An example Circle CI configuration for running Android tests.

circleci_android_tests.yml

version: 2
reference:
  ## Paths
  gradle_cache_path: &gradle_cache_path
    gradle_cache-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
  gems_cache_path: &gems_cache_path
    gems_cache-{{ checksum "Gemfile.lock" }}
  workspace: &workspace
    ~/src

  ## Configurations
  android_config: &android_config
    working_directory: *workspace
    macos:
      xcode: "9.4.0"
    shell: /bin/bash --login -eo pipefail
    environment:
      TERM: dumb
      JVM_OPTS: -Xmx3200m # Look at options

  ## Cache
  restore_gradle_cache: &restore_gradle_cache
    restore_cache:
      key: *gradle_cache_path

  restore_gems_cache: &restore_gems_cache
    restore_cache:
      key: *gems_cache_path

  save_gradle_cache: &save_gradle_cache
    save_cache:
      key: *gradle_cache_path
      paths:
        - ~/.gradle

  save_gems_cache: &save_gems_cache
    save_cache:
      key: *gems_cache_path
      paths:
        - vendor/bundle

  ## Dependencies
  ruby_dependencies: &ruby_dependencies
    run:
      name: Download Ruby Dependencies
      command: bundle check || bundle install --path vendor/bundle

  android_dependencies: &android_dependencies
    run:
      name: Download Android Dependencies
      command: ./gradlew androidDependencies


jobs:
  ui_test:
    <<: *android_config
    steps:
      - checkout
      # Setup Android Variables for Android Emulator
      - run:
          name: Setup environment variables
          command: |
            echo 'export PATH="$PATH:/usr/local/opt/node@8/bin:${HOME}/.yarn/bin:${HOME}/${CIRCLE_PROJECT_REPONAME}/node_modules/.bin:/usr/local/share/android-sdk/tools/bin"' >> $BASH_ENV
            echo 'export ANDROID_HOME="/usr/local/share/android-sdk"' >> $BASH_ENV
            echo 'export ANDROID_SDK_HOME="/usr/local/share/android-sdk"' >> $BASH_ENV
            echo 'export ANDROID_SDK_ROOT="/usr/local/share/android-sdk"' >> $BASH_ENV
            echo 'export QEMU_AUDIO_DRV=none' >> $BASH_ENV
            echo 'export JAVA_HOME=/Library/Java/Home' >> $BASH_ENV
      # Install Android SDK
      - run:
          name: Install Android sdk
          command: |
            HOMEBREW_NO_AUTO_UPDATE=1 brew tap homebrew/cask
            HOMEBREW_NO_AUTO_UPDATE=1 brew cask install android-sdk
      # Install Emulator
      - run:
          name: Install emulator
          command: (yes | sdkmanager "platform-tools" "platforms;android-26" "extras;intel;Hardware_Accelerated_Execution_Manager" "build-tools;26.0.0" "system-images;android-26;default;x86" "emulator" --verbose) || true
      # Gradle and ruby/fastlane dependencies
      - *restore_gradle_cache
      - *android_dependencies
      - *save_gradle_cache

      - *restore_gems_cache
      - *ruby_dependencies
      - *save_gems_cache
      # Start emulator
      - run: avdmanager create avd -n Nexus_5X_API_26_x86 -k "system-images;android-26;default;x86" -d "Nexus 5X"
      - run: osascript ./fastlane/recording_related/dismiss_warning.scpt # Dismisses the same named computer error
      - run:
          name: Run emulator in background
          command: /usr/local/share/android-sdk/tools/emulator @Nexus_5X_API_26_x86 -skin 1080x2066 -memory 2048 -noaudio
          background: true
      # Tests
      - run:
          name: Run Tests
          command: bundle exec fastlane ui_test
          no_output_timeout: 30m
      # Store video and Test results
      - store_artifacts:
          path: /Users/distiller/src/testrecording.mov
      - store_artifacts:
          path: /Users/distiller/src/app/build/reports/androidTests/connected/index.html


workflows:
  version: 2
  commit-workflow:
    jobs:
      - ui_test