Book Image

Android Studio 4.0 Development Essentials - Kotlin Edition

By : Neil Smyth
Book Image

Android Studio 4.0 Development Essentials - Kotlin Edition

By: Neil Smyth

Overview of this book

Kotlin as an Android-compatible programming language is becoming increasingly popular. Fully updated for Android Studio 4.0, this book will teach you the skills necessary to develop Android-based applications using Kotlin. Starting with the basics, this book outlines the steps necessary to set up Android development and testing environments, and goes on to introduce you to programming in Kotlin. You’ll practice Java to Kotlin code conversion and explore data types, operators, expressions, loops, functions, as well as the basics of OOP in Kotlin. You’ll then learn about Android architecture components and advanced topics, such as intents, touchscreen handling, gesture recognition, multi-window support integration, and biometric authentication. As you make progress, you’ll explore Android Studio 4.0’s key features, including layout editor, direct reply notifications, and dynamic delivery. You’ll also delve into Android Jetpack and create a sample app project using ViewModel, the Android Jetpack component. Finally, you will upload your app to Google Play Console and model the build process using Gradle. By the end of this Android book, you’ll be fully prepared to develop applications using Android Studio 4.0 and Kotlin.
Table of Contents (97 chapters)
97
Index

51.8 Adding Position Keyframes

The final task for this tutorial is to add two position keyframes (KeyPosition) to the animation path to introduce some lateral movement in to the animation. With the transition timeline visible in the MotionLayout editor, click on the button to create a keyframe as highlighed in Figure 51-13 above and select the KeyPosition option from the menu as shown in Figure 51-21 below:

Figure 51-21

In the resulting dialog, set the properties as illustrated in Figure 51-22:

Figure 51-22

Click on the Add button to commit the change, then repeat the above steps to add a second position keyframe configured as follows:

Position: 75

Type: parentRelative

PercentX: 0.85

PercentY: 0.75

On completion of these changes, the following keyframe entries will have been added to the transition element in the activity_main_scene.xml file:

<KeyFrameSet>

.

.

   <KeyPosition

...