build.gradle

buildscript {
    ext.kotlin_version = '1.0.4'
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

    }
}

allprojects {
    repositories {
        mavenCentral()
    }

    afterEvaluate { project ->
        def propsFile = rootProject.file('../keystore.properties')
        def configName = 'release'

        if (propsFile.exists() && android.signingConfigs.hasProperty(configName)) {
            def props = new Properties()
            props.load(new FileInputStream(propsFile))
            android.signingConfigs[configName].storeFile = file(props['storeFile'])
            android.signingConfigs[configName].storePassword = props['storePassword']
            android.signingConfigs[configName].keyAlias = props['keyAlias']
            android.signingConfigs[configName].keyPassword = props['keyPassword']
        }
    }
 }