Android Programming: The Big Nerd Ranch Guide, 4th Edition

Room Architecture Component Library

Room is a Jetpack architecture component library that simplifies database setup and access. It allows you to define your database structure and queries using annotated Kotlin classes.

Room is composed of an API, annotations, and a compiler. The API contains classes you extend to define your database and build an instance of it. You use the annotations to indicate things like which classes need to be stored in the database, which class represents your database, and which class specifies the accessor functions to your database tables. The compiler processes the annotated classes and generates the implementation of your database.

To use Room, you first need to add the dependencies it requires. Add ...