Gradle is based on Groovy, yet very little knowledge of the JVM language is required for you to get started. Code examples use Android SDK version 23, with emulators from Marshmallow (Android 6) or Lollipop (Android 5). If you’re comfortable with Java and Android, you’re ready.
Ken Kousen is an independent consultant and trainer specializing in Spring, Hibernate, Groovy, and Grails. He holds numerous technical certifications, along with degrees in Mathematics, Mechanical and Aerospace Engineering, and Computer Science.