Travis build file for Android: the whole file

.travis.yml

language: java
dist: trusty
jdk: oraclejdk8

before_cache:
  # Do not cache a few Gradle files/directories (see https://docs.travis-ci.com/user/languages/java/#Caching)
  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/

cache:
  directories:
    # Android SDK
    - $HOME/android-cmdline-tools
    - $HOME/android-sdk

    # Gradle dependencies
    - $HOME/.gradle/caches/
    - $HOME/.gradle/wrapper/

    # Android build cache (see http://tools.android.com/tech-docs/build-cache)
    - $HOME/.android/build-cache

install:
  # Download and unzip the Android command line tools (if not already there thanks to the cache mechanism)
  # Latest version of this file available here: https://developer.android.com/studio/#command-tools
  - if test ! -e $HOME/android-cmdline-tools/cmdline-tools.zip ; then curl https://dl.google.com/android/repository/commandlinetools-linux-6609375_latest.zip > $HOME/android-cmdline-tools/cmdline-tools.zip ; fi
  - unzip -qq -n $HOME/android-cmdline-tools/cmdline-tools.zip -d $HOME/android-cmdline-tools

  # Install or update Android SDK components (will not do anything if already up to date thanks to the cache mechanism)
  - echo y | $HOME/android-cmdline-tools/tools/bin/sdkmanager --sdk_root=$HOME/android-sdk 'platform-tools' > /dev/null
  # Latest version of build-tools available here: https://developer.android.com/studio/releases/build-tools.html
  - echo y | $HOME/android-cmdline-tools/tools/bin/sdkmanager --sdk_root=$HOME/android-sdk 'build-tools;29.0.3' > /dev/null
  - echo y | $HOME/android-cmdline-tools/tools/bin/sdkmanager --sdk_root=$HOME/android-sdk 'platforms;android-29' > /dev/null

env:
  - ANDROID_HOME=$HOME/android-sdk

script: ./gradlew --no-daemon --parallel lintDebug testDebug

@BoD Very good approach. I want to know, how do you invalidate/clear the cache, when for example there is a new version of build tools.

@jzferino Well the build tools are always updated (for each build), line 31. But if you need to invalidate the cache for any reason, there is a UI to do that in the Travis interface (on the upper right, More options / Caches).

@BoD Nice!
It'd be great to have also the NDK included.
Thanks for sharing.

Is it possible to run the emulator using this script?

I tried... but it looks can't detect device connect.