build.gradle

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

buildscript {
    ext.kotlin_version = '1.2.41'
    repositories {
        google()
        jcenter()
        maven {
            url 'https://maven.fabric.io/public'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.0.1'
        classpath 'io.fabric.tools:gradle:1.25.4'

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

allprojects {
    repositories {
        google()
        jcenter()
        maven {
            url "https://maven.google.com" // Google's Maven repository
        }
    }
}

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

//repositories {
//    mavenCentral()
//}
//dependencies {
//    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
//}
//compileKotlin {
//    kotlinOptions {
//        jvmTarget = "1.8"
//    }
//}
//compileTestKotlin {
//    kotlinOptions {
//        jvmTarget = "1.8"
//    }
//}