build.gradle

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

buildscript {
    ext.kotlin_version = '1.2.51'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.3'
        classpath 'com.github.dcendents:android-maven-gradle-plugin:2.0'
        classpath 'com.google.gms:google-services:4.0.1'
        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()
        maven { url "https://jitpack.io" }
    }
}

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

// Define versions in a single place
ext {
    // Sdk and tools
    minSdkVersion = 14
    targetSdkVersion = 27
    compileSdkVersion = 27
    buildToolsVersion = '27.0.3'

    // Dependencies versions
    supportLibraryVersion = '27.1.1'
    butterKnifeVersion = '8.8.1'
    picassoVersion = '2.5.2'
    rxandroidVersion = '1.2.1'
    rxjavaVersion = '1.1.9'
    junitVersion = '4.12'
}