build.gradle

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

buildscript {

    ext.kotlin_version = '1.2.60'

    repositories {
        google()
        jcenter()

        maven { url 'https://maven.google.com' } // Added for Room Persistence Library
        maven { url 'https://mvnrepository.com/artifact/commons-net/commons-net' } // Added for Apache Commons NET library
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'
        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
}