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'
    repositories {
        jcenter()
        maven { url 'https://maven.google.com' }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:3.1.2'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

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

task clean(type: Delete) {
    delete rootProject.buildDir
}
repositories {
    mavenCentral()
}
ext {
    minSdkVersion = 17
    targetSdkVersion = 26
    compileSdkVersion = 26
    buildToolsVersion = '26.0.2'

    supportLibraryVersion = appCompatVersion = '26.1.0'
    designSupportVersion = '26.1.0'
    playServicesVersion = '11.4.2'
    dagger = '2.10'
    firebaseAuth = firebaseConfig = '11.4.2'
    firebaseDb = '11.4.2'
    firebaseUI = '3.1.0'
    facebookSdk = '4.27.0'
    twitterSdk = '3.1.1'
    databinding = '3.0.0'
    arch = '1.0.3'
    archext = '1.0.0-rc1'
    archcomp = '1.0.0-rc1'
    leakcanary = '1.5.1'
    junit = '4.12'
}