The app gradle file

build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion(compileSdk)
    buildToolsVersion(buildTools)
    defaultConfig {
        minSdkVersion(minSdk)
        targetSdkVersion(targetSdk)

        applicationId "com.stickerbox.gradle"

        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

internalLib(retrofit)
internalLib(rxAndroid)
internalLib(gson)
internalLib(constraintLayout)
internalLib(supportv4)
internalLib(appcompatv7)

test(unittest.junit)

androidTest(uitest.espresso)

dependencies {
}