Hello again! Can you believe that one important part of this book is already behind us? We are finished with the user interface, and, now, we are heading into a more complex part of the book--the system.

In this chapter, and the ones following, we will dig deep into the structure of the Android system. You will learn about permissions, database handling, preferences, concurrency, services, messaging, the backend, APIs, and high performances.

However, you shouldn't let yourself be fooled; this book and its content does not cover the entire framework. That is simply impossible; Android is such a vast framework that it can take you years to completely master it. Here, we are merely penetrating into the world of Android and Kotlin. ...

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