Book Image

Mastering Android Development with Kotlin

By : Miloš Vasić
Book Image

Mastering Android Development with Kotlin

By: Miloš Vasić

Overview of this book

Kotlin is a programming language intended to be a better Java, and it's designed to be usable and readable across large teams with different levels of knowledge. As a language, it helps developers build amazing Android applications in an easy and effective way. This book begins by giving you a strong grasp of Kotlin's features in the context of Android development and its APIs. Moving on, you'll take steps towards building stunning applications for Android. The book will show you how to set up the environment, and the difficulty level will grow steadily with the applications covered in the upcoming chapters. Later on, the book will introduce you to the Android Studio IDE, which plays an integral role in Android development. We'll use Kotlin's basic programming concepts such as functions, lambdas, properties, object-oriented code, safety aspects, type parameterization, testing, and concurrency, which will guide you through writing Kotlin code in production. We'll also show you how to integrate Kotlin into any existing Android project.
Table of Contents (24 chapters)
Title Page
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Setting animations


We consider our layout to be nice. It is pretty. But can it be more entertaining? Sure it can! If we make our layout more interactive we will achieve a better user experience and attract users to use it. We will achieve that by adding some animations. Animations can be defined through the code or by animating view properties. We will improve each of the screens by adding simple and effective opening animations.

Animations defined as resources are located in the anim resources directory. We will need a few animation resources there--fade_in, fade_out, bottom_to_top, top_to_bottom, hide_to_top, hide_to_bottom. Create them and define them according to these examples:

  • fade_in:
        <?xml version="1.0" encoding="utf-8"?> 
        <alpha xmlns:android=
        "http://schemas.android.com/apk/res/android" 
        android:duration="300" 
        android:fromAlpha="0.0" 
        android:interpolator="@android:anim/accelerate_interpolator" 
        android:toAlpha="1.0...