This document discusses best practices for designing mobile user experiences that transition between iOS and Android platforms. It emphasizes that iOS and Android have different design philosophies and patterns that must be understood. Specifically, it notes that iOS focuses on simplicity, clarity and depth while Android follows Material Design principles of bold graphics and intentional motion. Directly porting an iOS design to Android is discouraged as the two platforms have different navigation, buttons, notifications and other interface conventions. The document provides an overview of major Android design components and patterns to consider when adapting a mobile experience for both platforms.