Liferay Screens applies architectural ideas from Model View Presenter, Model View ViewModel, and VIPER. Screens isn’t considered a canonical implementation of these architectures, because it isn’t an app, but it borrows from them to separate presentation layers from business-logic. This tutorial explains Screen’s high-level architecture, its components’ low-level architecture, and the Android Screenlet lifecycle. Now go ahead and get started examining Screens’s building blocks!