android programming with kotlin for beginners

The core libraries of RxJava and Coroutines are covered for asynchronous programming. You’ll also learn how AAC (Android Architecture Components) are used to cleanly structure your code and explore various architecture patterns and the benefits of dependency injection. Moving on, you’ll get to grips with testing, covering the full spectrum of the test pyramid. You’ll then learn about mapping, location services, and the permissions model before working with notifications and how to persist data. Progressing through the chapters and lectures, you’ll delve into Android’s RecyclerView to make the most of displaying lists of data and become comfortable with fetching data from a web service and handling images. You’ll cover the fundamentals of Android development, from structuring an app to building out the UI with Activities and Fragments and various navigation patterns. Then, you’ll learn how to create apps and run them on virtual devices through guided exercises. In this particular case, I can see where Kotlin’s way of explicitly marking base class members as open for inheritance and derived class members as overrides avoids several kinds of common Java errors.

This is all of a piece with Kotlin’s philosophy of making things explicit rather than relying on defaults. To override a superclass method, the method itself must be marked open, and the subclass method must be marked override.

Kotlin classes have to be marked with the open keyword in order to allow other classes to inherit from them Java classes are kind of the opposite, as they are inheritable unless marked with the final keyword.

Android programming with kotlin for beginners