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'
        }
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'

        // 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/'
            name 'Google'
        }
    }
}

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

ext {
    compileSdkVersion=27
    buildToolsVersion = '27.0.3'
    targetSdkVersion = 26
    minSdkVersion = 19
    releaseVersionCode = 1
    releaseVersionName = '1.0.0'
    supportLibVersion = "27.0.2"

    rxjava2Version = '2.0.8'
    retrofit2Version = '2.2.0'
    rxlifecycle='2.2.1'
    gsonVersion = '2.8.0'
    butterknifeVersion = '8.5.1'
}