How to speed up Android Gradle build in continuous integration

Below is a sample task for Concourse CI, which caches gradle packages for future builds.

build_android.sh

---
platform: linux

image_resource:
  type: docker-image
  source:
    repository: alvrme/alpine-android
    tag: android-28

inputs:
  - name: app-repo

run:
  path: app-repo/ci/tasks/build_android.sh

caches:
  - path: .gradle

build.sh

#!/bin/sh

set -eux

export ROOT_FOLDER=$(pwd)
export GRADLE_USER_HOME="${ROOT_FOLDER}/.gradle"

cd app-repo

./gradlew assembleDebug

At the beginning of shell script I set the path GRADE_USER_HOME to be relative to the currently used workspace, so that Concourse can save the files for later.

How to speed up Android Gradle build in continuous integration

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