~/.circleci/

config.yml

version: 2
jobs:
  build:
    working_directory: ~/code
    docker:
    - image: circleci/android:api-28-alpha
    environment:
      JVM_OPTS: -Xmx3200m
    steps:
    - checkout
    - restore_cache:
        key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
    # - run:
    # name: Chmod permissions #if permission for Gradlew Dependencies fail, use this.
    # command: sudo chmod +x ./gradlew
    - run:
        name: Download Dependencies
        pre:
          - echo y | android update sdk --no-ui --filter "android-28"
          - echo y | android update sdk --no-ui --filter "build-tools-28.0.0"
          - echo y | android update sdk --no-ui --filter "extra-android-m2repository"
          - echo y | android update sdk --no-ui --filter "extra-android-support"
          - echo y | android update sdk --no-ui --filter "extra-google-m2repositor"
        command: ./gradlew androidDependencies
    - save_cache:
        paths:
        - ~/.gradle
        key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
    - run:
        name: Run Tests
        command: ./gradlew lint test
    - store_artifacts: # for display in Artifacts: https://circleci.com/docs/2.0/artifacts/
        path: app/build/reports
        destination: reports
    - store_test_results: # for display in Test Summary: https://circleci.com/docs/2.0/collect-test-data/
        path: app/build/test-results
    # See https://circleci.com/docs/2.0/deployment-integrations/ for deploy examples