Android Circle CI config involving workflows, caching and sharing the workspace between steps in workflow.

ci-setup.sh

#!/usr/bin/env bash

# Accept licenses
${ANDROID_HOME}/tools/bin/sdkmanager --licenses

# Install dependencies
./gradlew androidDependencies || true

config.yml

version: 2.0

references:

  workspace_root: &workspace_root
      ~/workspace

  container_config: &container_config
    docker:
      - image: circleci/android:api-28

    working_directory: *workspace_root

    environment:
      TERM: dumb
      JVM_OPTS: -Xmx4096m

  attach_workspace: &attach_workspace
    attach_workspace:
      at: *workspace_root

  general_cache_key: &general_cache_key
      key: app-{{ checksum "build.gradle.kts" }}-{{ checksum "app/build.gradle.kts" }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "gradle.properties" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}

jobs:

  build:
    <<: *container_config
    steps:
      - checkout

      - restore_cache:
          <<: *general_cache_key
      - run:
          name: Setup environment
          command: scripts/ci-setup.sh
      - save_cache:
          <<: *general_cache_key
          paths:
            - "~/.gradle"
            - "~/.m2"
            - "/opt/android-sdk-linux/licenses/"

      - run:
          name: Build
          command: ./gradlew assembleDebug

      - store_artifacts:
          path: app/build/outputs/apk/
          destination: apks/

      - persist_to_workspace:
          root: *workspace_root
          paths:
            - .

  check:
    <<: *container_config
    steps:
      - *attach_workspace

      - restore_cache:
          <<: *general_cache_key

      - run:
          name: Run checks
          command: ./gradlew lintDebug ktlintCheck

      - store_artifacts:
          path: app/build/reports/
          destination: lint_reports/app/

  test:
    <<: *container_config
    steps:
      - *attach_workspace

      - restore_cache:
          <<: *general_cache_key

      - run:
          name: Run tests
          command: ./gradlew testDebugUnitTest

      - store_artifacts:
          path: app/build/reports/tests/
          destination: tests_reports/

      - store_test_results:
          path: app/build/test-results

workflows:
  version: 2

  build_check_tests:
    jobs:
      - build
      - check:
          requires:
            - build
      - test:
          requires:
            - build