build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.1.51'
    ext {
        buildToolsVersion = "26.0.2"
        compileSdkVersion = 26
        defaultMinSdkVersion = 19
        defaultTargetSdkVersion = 26

        kotlin_version = "1.1.51"
        lottie_version = "2.2.0"

        android_support_version = "25.3.1"

        junit_version = "4.12"
    }

    ext.libraries = [
            android_appcompat  : "com.android.support:appcompat-v7:$android_support_version",
            design_support     : "com.android.support:design:$android_support_version",
            kotlin             : "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version",
            lottie             : "com.airbnb.android:lottie:$lottie_version",

            // TESTING
            junit              : "junit:junit:$junit_version"
    ]
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

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

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}