Android is a complete set of software for mobile devices such as tablet computers, notebooks, smartphones, electronic book readers, set-top boxes, etc.
It contains a Linux-based Operating System, middleware, and key mobile applications.
Kotlin has developed continuously, not only as a language but as a whole ecosystem with robust tooling. Now it's seamlessly integrated in Android Studio and is actively used by many companies for developing Android applications.
The book has 17 parts in total:
Chapter 1: Getting Started With Android Studio
Chapter 2: Activity and User Interface
Chapter 3: Building a Simple UI
Chapter 4: Android Events
Chapter 5: Basic Controls
Chapter 6: Working With Layouts
Chapter 7: The Constraint Layout
Chapter 8: Programming The UI
Chapter 9: Menus - Toolbar
Chapter 10: Menus - Context & Popup
Chapter 11: Resources
Chapter 12: Bitmap Graphics
Chapter 13: Life Cycle Of An Activity
Chapter 14: Spinners
Chapter 15: Pickers
Chapter 16: ListView
Chapter 17: Android the Kotlin Way