build-android/cmake/layerlib/build.gradle

apply plugin: 'com.android.library'

android {
    /*
     * we are interested in only the debug version of layers, so ONLY publish debug version
     * library, which will enforce building ONLY debug version, and packing only the debug
     * version of layers. The document is at:
     *     https://developer.android.com/studio/build/build-variants.html
     *     http://tools.android.com/tech-docs/new-build-system/user-guide#TOC-Library-Publication
     */
    publishNonDefault  true

    compileSdkVersion 25
    buildToolsVersion "25.0.2"

    defaultConfig {
        minSdkVersion 24
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        ndk.abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
        externalNativeBuild {
            cmake.arguments '-DANDROID_TOOLCHAIN=clang',
                            '-DANDROID_STL=gnustl_static',
                            '-DANDROID_PLATFORM=android-24'
        }
    }
    externalNativeBuild {
        cmake.path 'CMakeLists.txt'
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'),
                    'proguard-rules.pro'
        }
    }
}