Book Image

How to Build Android Apps with Kotlin

By : Alex Forrester, Eran Boudjnah, Alexandru Dumbravan, Jomar Tigcal
Book Image

How to Build Android Apps with Kotlin

By: Alex Forrester, Eran Boudjnah, Alexandru Dumbravan, Jomar Tigcal

Overview of this book

Are you keen to get started building Android 11 apps, but don’t know where to start? How to Build Android Apps with Kotlin is a comprehensive guide that will help kick-start your Android development practice. This book starts with the fundamentals of app development, enabling you to utilize Android Studio and Kotlin to get started building Android projects. You'll learn how to create apps and run them on virtual devices through guided exercises. Progressing through the chapters, you'll delve into Android’s RecyclerView to make the most of lists, images, and maps, and see how to fetch data from a web service. Moving ahead, you'll get to grips with testing, learn how to keep your architecture clean, understand how to persist data, and gain basic knowledge of the dependency injection pattern. Finally, you'll see how to publish your apps on the Google Play store. You'll work on realistic projects that are split up into bitesize exercises and activities, allowing you to challenge yourself in an enjoyable and attainable way. You'll build apps to create quizzes, read news articles, check weather reports, store recipes, retrieve movie information, and remind you where you parked your car. By the end of this book, you'll have the skills and confidence to build your own creative Android applications using Kotlin.
Table of Contents (17 chapters)
12. Dependency Injection with Dagger and Koin

Preparing Your Apps for Release

Before publishing an app on Google Play, you must make sure that it is signed with a release key and that it has the correct version information. Otherwise, you won't be able to publish a new app or an update to an already-published app.

Let's start with adding versions to your app.

Versioning Apps

The version of your app is important for the following reasons:

  • Users can see the version they have downloaded. They can use this when checking whether there's an update or whether there are known issues when reporting bugs/problems with the app.
  • The device and Google Play use the version value to determine whether an app can or should be updated.
  • Developers can also use this value to add feature support in specific versions. They can also warn or force users to upgrade to the latest version to get important fixes on bugs or security issues.

An Android app has two versions: versionCode and versionName. Now, versionCode...