build.gradle

import groovy.json.JsonSlurper

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

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        mavenLocal()
        mavenCentral()
        maven {
            url 'https://maven.google.com/'
            name 'Google'
        }
        jcenter()
    }
}

apply plugin: 'com.android.library'

def computeCompileSdkVersion = { -> project.hasProperty("compileSdk") ? compileSdk : 24 }
def computeBuildToolsVersion = { ->
    project.hasProperty("buildToolsVersion") ? buildToolsVersion : "27.0.3"
}

android {
    applyBeforePluginGradleConfiguration()

    compileSdkVersion computeCompileSdkVersion()
    buildToolsVersion computeBuildToolsVersion()

    defaultConfig {
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
    }
}

dependencies {
    def supportVer = "27.0.1"
    if (project.hasProperty("supportVersion")) {
        supportVer = supportVersion
    }
    compileOnly "com.android.support:support-v4:$supportVer"
    compileOnly "com.android.support:appcompat-v7:$supportVer"
}

def getAppResourcesPath() {
    def relativePathToApp = "app"
    def relativePathToAppResources
    def absolutePathToAppResources
    def projectRoot = "$rootDir/../../.."
    def nsConfigFile = file("$projectRoot/nsconfig.json")
    def nsConfig

    if (nsConfigFile.exists()) {
        nsConfig = new JsonSlurper().parseText(nsConfigFile.getText("UTF-8"))
    }

    if(nsConfig != null && nsConfig.appPath != null){
        relativePathToApp = nsConfig.appPath
    }

    if(nsConfig != null && nsConfig.appResourcesPath != null ) {
        relativePathToAppResources = nsConfig.appResourcesPath
    } else {
        relativePathToAppResources  = "$relativePathToApp/App_Resources"
    }

    absolutePathToAppResources = java.nio.file.Paths.get(projectRoot).resolve(relativePathToAppResources).toAbsolutePath()

    project.ext.appResourcesPath = absolutePathToAppResources

    return absolutePathToAppResources
}

def applyBeforePluginGradleConfiguration() {
    def appResourcesPath = getAppResourcesPath()
    def pathToBeforePluginGradle = "$appResourcesPath/Android/before-plugins.gradle"
    def beforePluginGradle = file(pathToBeforePluginGradle)
    if (beforePluginGradle.exists()) {
        println "\t + applying user-defined configuration from ${beforePluginGradle}"
        apply from: pathToBeforePluginGradle
    }
}