NDK, CMake, and Android in TravisCI

Question

I'm trying to set up my CI for a Android project that uses some C++ code. As such I need the NDK that doesn't come pre-installed on Travis Android images. I'm currently achieving this by pulling the NDK myself, however my CI box is complaining about the CMake license not being accepted. The weird thing is that I thought this was included in the android-sdk-license which I am already including in my build. My travis YAML looks like this:

language: android

jdk:
  - oraclejdk8
  - oraclejdk9

android:
  components:
    - tools
    - platform-tools
    - tools
    - build-tools-26.0.2
    - android-26
    - extra-android-m2repository
    - extra-google-m2repository
    - extra-android-support
    - extra-google-google_play_services
    - add-on
    - extra

licenses:
  - 'android-sdk-preview-license-.+'
  - 'android-sdk-license-.+'

before_script:
  - wget https://dl.google.com/android/repository/android-ndk-r16b-linux-x86_64.zip
  - unzip -qq android-ndk-r16b-linux-x86_64.zip
  - export ANDROID_NDK_HOME=`pwd`/android-ndk-r16b
  - export LOCAL_ANDROID_NDK_HOME="$ANDROID_NDK_HOME"
  - export LOCAL_ANDROID_NDK_HOST_PLATFORM="linux-x86_64"
  - export PATH=$PATH:${ANDROID_NDK_HOME}
  - env

script: ./gradlew build jacocoTestReport

matrix:
  fast_finish: true
  allow_failures:
    - jdk: oraclejdk9

notifications:
  email: false

after_success:
  — bash <(curl -s https://codecov.io/bash)

The license error can be seen at the bottom of the build here

Answer 1

I didn't try it but perhaps it's similar to the constraint library related issue.

As explained here and here, use a workaround to solve license issues or directly download it:

is there any solution without workaround using export license?

Yes, you can use the new sdkmanager to install the constraint library and accept the license:

  - echo yes | sdkmanager "extras;m2repository;com;android;support;constraint;constraint-layout;1.0.2"
  - echo yes | sdkmanager "extras;m2repository;com;android;support;constraint;constraint-layout-solver;1.0.2"

In your case, check the correct version for cmake like here and here, cmake;3.6.4111459:

  - sdkmanager --list || true

  - echo yes | sdkmanager "cmake;3.6.4111459"

Otherwise, the missing component will be detected by gradle and downloaded without accept it:

  # Show version and download Gradle Wrapper if it's not already cached
  - ./gradlew --version
  # Clean project and download missing dependencies and components
  - ./gradlew clean build

In that case, as explained here, you need to accept the license the first time via the workaround:

In your .travis.yml file add:

before_install:
  - mkdir "$ANDROID_HOME/licenses" || true
  - echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
  - echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd" > "$ANDROID_HOME/licenses/android-sdk-preview-license"

Do not forgot to accept all the licences on the main android object:

android:
  components:
    # ...
  licenses:
    - android-sdk-license-.+
    - '.+'

Before android script deprecation, you can accept all the licenses at the same time like this:

# THE SETUP STAGE
# ---------------
# If you comment out this section, Travis CI will install for you the components you define here.
# Check your project requirements and the components included by default on Travis-ci VM images.
# Check required: https://github.com/google/iosched/blob/master/doc/BUILDING.md
# Check defaults: http://docs.travis-ci.com/user/languages/android/#Pre-installed-components

android:
  components:
    # Check Android SDK tools: http://developer.android.com/tools/sdk/tools-notes.html
    # Check Android SDK Platform-tools: http://developer.android.com/tools/revisions/platforms.html
    # Comment the lines below if the latest revisions of Android SDK Tools are included by default.
    # - tools
    # - platform-tools
    # ...
  licenses:
    # Check licenses: http://docs.travis-ci.com/user/languages/android/#Dealing-with-Licenses
    # By default Travis will accept all the licenses, but it's also possible to define a white list:
    # White list current android-sdk-license revision.
    # - 'android-sdk-license-5be876d5'
    # White list all android-sdk-license revisions.
    # - 'android-sdk-license-.+'
    # White list all the licenses.
    - '.+'

I think that if you remove licenses section, 'white list all the licenses' - '.+' is applied by default.

Answer 2

This is currently working for me:

install:
  - echo y | sdkmanager 'ndk-bundle'
  - echo y | sdkmanager 'cmake;3.6.4111459'
  - echo y | sdkmanager 'lldb;3.0'

My .travis.yml is available here.

Answer 3

Looks like the NDK samples use travis, maybe look there to see what's missing from your build: https://github.com/googlesamples/android-ndk/blob/master/.travis.yml