build.gradle

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

buildscript {
    ext.kotlin_version = '1.2.30'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'
        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
}
ext {
    compileSdkVersion = 27
    minSdkVersion = 19
    supportLibraryVersion = '27.1.1'
    constraintLayoutVersion = '1.1.0'
    jUnitVersion = '4.12'
    testRunnerVersoin = '1.0.2'
    espressoVersion = '3.0.2'
    retrofitVersion = '2.3.0'
    picassoVersion = '2.5.2'
    roomVersion = '1.0.0'
    archLifecycleVersion='1.1.0'
}