top level gradle

build.gradle

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

buildscript {
  repositories {
    jcenter()
  }
  dependencies {
    classpath 'com.android.tools.build:gradle:2.1.2'
    // dagger2
    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
    // Retrolambda
    classpath 'me.tatarka:gradle-retrolambda:3.2.5'

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

allprojects {
  repositories {
    jcenter()
  }
}

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