- Install the Lombok plugin via Android Studio -> Preferences -> Plugins (Search repositories).
- Enable Annotation Processing. With the project open go to: File -> Other Settings -> Default Settings Build, Executio... -> Compiler -> Annotation Processors
- Finally to be sure click File -> Invalidate Cache and Restart Android Studio
- Remove tonnes of boilerplate around generating value classes, getter/setters, builders, null value checks, all kinds of good stuff. See https://projectlombok.org/features/index.html