"Processing for Android" is a technical book aimed at developers and enthusiasts who want to use the Processing programming language and environment to create Android applications. The book provides a comprehensive introduction to the fundamentals of the Processing language and demonstrates how to program interactive graphics in 2D, 3D, and Extended Reality (XR). It covers the application of these techniques across various Android devices, including smartphones, tablets, wearables, and smartwatches. The updated edition guides readers through the entire app development process, from the initial idea to publication in the Google Play App Store. Through a variety of practical projects, ranging from simple sketches to more complex applications involving shaders, VR, and AR, readers gain valuable experience to develop their own projects and share them with the world.