IntelliJ IDEA, on which Android Studio is based, has been evolving for many years. Part of this evolution is the many customization features that proliferate with each software release. These numerous customizable features, combined with hundreds of third-party plug-ins, make IntelliJ, and now by extension, Android Studio, among the most customizable and flexible IDEs on the market. In fact, almost anything you can imagine being customized in an IDE is customizable in Android Studio. The customizable features in Android Studio are so numerous that we cannot reasonably cover them all. Throughout this book, we’ve already discussed some of the most important customizable features of Android Studio, including tool buttons and default layouts ( Chapter 2), and live templates, code generation, and code styles ( Chapter 3).