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

Meet the Logcat


Logcat is an important part of everyday development. Its purpose is to display all logs coming from your device. It displays logs from an emulator or a live device connected. Android has several levels of log messages:

  • Assert
  • Verbose
  • Debug
  • Information
  • Warning
  • Error

You can filter log messages by these log levels (for example, when you need to see only errors--application crash stacktrace) or log tag (we will explain this later); or by keyword, regex, or the application package. Before we apply any filter, we will configure Android Studio so the log messages are colored differently.

Choose Android Studio | Preferences. In the search field, enter Logcat. Logcat coloring preferences appears, as shown in the following screenshot:

To edit coloring, you must save a copy of the current coloring theme. Choose your theme from the drop-down list and choose Save As. Choose some proper name and confirm:

Choose Assert from the list and uncheck Use inherited attributes to override the color. Make...