Thanks for the PR. I'm a bit reluctant to add yet another build config, because it will increase maintenance burden, but will be OK adding it to the support directory.

@vitaut Confirmed.
In my experience, Android Studio requires to place build.gradle at the root directory. But I will try to find a way to meet your opinion.

P.S. Since Travis CI's Android build doesn't contain NDK in its image, checking this build config in Travis can take more than 5 min. I will provide the detailed log when things become clear.

@luncliff, any luck moving the build config to a subdirectory?

@vitaut Sorry for my laziness. I've been doing multiple works last month.

Change

• build.gradle file in support/
• Additional Travis CI build config

build.gradle file references CMakeLists.txt using a relative path.

For build config, you can find a column in the build matrix. Since Travis-CI image doesn't contain NDK bundle, I had to install it manually with sdkmanager. I used Gradle 4.3.1 with download to save build time, but it still takes more than 5 minute in general.

matrix:
  # ...
  include:
    - language: android
      android:
      components:
        - tools
        - platform-tools
        - android-21
        - sys-img-armeabi-v7a-android-21
      env:
        - ANDROID=true
      before_install:
        - git submodule update --init --recursive
        - sudo apt-get install wget unzip tree
      install:
        # Accept SDK Licenses + Install NDK
        - yes | sdkmanager --update > /dev/null 2>&1
        - sdkmanager ndk-bundle > /dev/null 2>&1
        # Download Gradle 4.3.1 
        - wget https://services.gradle.org/distributions/gradle-4.3.1-bin.zip
        - mkdir -p gradle
        - unzip -q -d ./gradle gradle-4.3.1-bin.zip
        - export GRADLE=${TRAVIS_BUILD_DIR}/gradle/gradle-4.3.1/bin/gradle
      before_script:
        - bash $GRADLE --version
        - cd ./support
      script:
        - bash $GRADLE clean assemble
      after_success:
        - cd ${TRAVIS_BUILD_DIR}
        - tree ./libs

At the end of the build, you can see the file tree created with Gradle task.

No worries, thanks a lot for updating the PR. 5+ mins is not a big problem I guess since the CI build is asynchronous.