build.gradle

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

buildscript {
    repositories {
        jcenter()
        maven {
            url 'https://maven.google.com/'
            name 'Google'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.1'
        classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'

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

    ext.kotlin_version = '1.2.50'
    ext.build_tools_version = '27.0.3'
    ext.support_version = '27.1.1'
    ext.butterknife_version = '8.8.1'
    ext.compile_sdk_version = 27
}

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

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