pEpJNIAdapter/android/build.gradle

// Android pEp JNI adapter Aar gradle build script

import org.apache.tools.ant.taskdefs.condition.Os

def pEpEngineSrc = hasProperty('pEpEngineSrc') ? pEpEngineSrc : "../../pEpEngine"
def buildAutomatic = hasProperty('buildAutomatic') ? buildAutomatic : "true"

def pEpEngineAndroid = new File(new File(pEpEngineSrc), 'build-android')
def libetpanAndroid = new File(new File(pEpEngineSrc), '../libetpan/build-android')

def externalInstallDir = file('external/data/data/' + pEpAppPackageName + '/app_opt')
def externalIncludePath = new File(externalInstallDir, 'include').absolutePath

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.1.0'
    }
}

apply plugin: 'com.android.library'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    
    sourceSets {
        main {

            manifest.srcFile 'AndroidManifest.xml'

            // where to find generated Java source
            java.srcDirs = ['../src', 'src']

            // disable automatic ndk-build call, which ignore our Android.mk
            jni.srcDirs = []
            jniLibs.srcDir 'libs'
            assets.srcDirs = ['assets']
        }
    }

    dependencies {
        compile fileTree(dir: 'libs', include: '*.jar')
    }

    lintOptions {
        abortOnError false
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    // call source generation makefile target
    task genSources(type:Exec) {
        workingDir '../src'
        commandLine 'make', 'gensource'
    }

    // call external build (GnuPG, GPGME, etc)
    task buildExternal(type:Exec) {
        workingDir 'external'
        commandLine 'make', 'all', 'PEP_PACKAGE_NAME='+pEpAppPackageName
    }

    // call pEpEngine Build 
    task buildpEpEngine(type:Exec) {
        workingDir pEpEngineAndroid
        environment['GPGME_INCLUDE_PATH'] = externalIncludePath
        commandLine './build.sh'
    }
    if(buildAutomatic=="true"){
        buildpEpEngine.dependsOn buildExternal
    }

    // unzip some of the dependencies 
    task unzipDeps(type: Copy) {
        from zipTree(new File(pEpEngineAndroid, 'pEpEngine-android-1.zip'))
        from zipTree(new File(libetpanAndroid, 'libetpan-android-1.zip'))
        from zipTree(new File(libetpanAndroid, 'dependencies/openssl/openssl-android-1.zip'))
        from zipTree(new File(libetpanAndroid, 'dependencies/cyrus-sasl/cyrus-sasl-android-1.zip'))
        into file("${buildDir}")
    }

    if(buildAutomatic=="true"){
        unzipDeps.dependsOn buildpEpEngine
    }

    // copy pEpEnginge's system.db to asset 
    task cpDBAssets(type: Copy) {
        from file(new File(new File(pEpEngineSrc), 'db/system.db'))
        into 'assets'
    }

    // call regular ndk-build(.cmd) script from app directory
    task jniBuild(type: Exec) {
        commandLine getNdkBuildCmd(), 'V=1', 'GPGBUILD='+externalInstallDir.absolutePath
    }
    jniBuild.dependsOn genSources
    jniBuild.dependsOn unzipDeps
    jniBuild.dependsOn cpDBAssets

    // Ensure this is done before java build
    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn jniBuild
    }

    task cleanNative(type: Exec) {
        commandLine getNdkBuildCmd(), 'clean'
    }

    clean.dependsOn cleanNative

}

def getNdkDir() {
    if (System.env.ANDROID_NDK != null)
        return System.env.ANDROID_NDK

    Properties properties = new Properties()
    properties.load(project.rootProject.file('local.properties').newDataInputStream())
    def ndkdir = properties.getProperty('ndk.dir', null)
    if (ndkdir == null)
        throw new GradleException("NDK location not found. Define location with ndk.dir in the local.properties file or with an ANDROID_NDK environment variable.")

    return ndkdir
}

def getNdkBuildCmd() {
    def ndkbuild = getNdkDir() + "/ndk-build"
    if (Os.isFamily(Os.FAMILY_WINDOWS))
        ndkbuild += ".cmd"

    return ndkbuild
}