This book is for Android developers who are interested in learning about and developing Google Cardboard apps using the Google Cardboard native SDK. We assume that the reader has some knowledge of Android development and the Java language, but may be new to 3D graphics, virtual reality, and Google Cardboard. Novice developers, or those unfamiliar with the Android SDK, may find it hard to get started with this book. Those who aren't coming from an Android background may be better served by creating cardboard apps with a game engine like Unity.