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Kotlin Standard Library Cookbook

You're reading from   Kotlin Standard Library Cookbook Master the powerful Kotlin standard library through practical code examples

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Product type Paperback
Published in Jul 2018
Publisher Packt
ISBN-13 9781788837668
Length 242 pages
Edition 1st Edition
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Author (1):
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Samuel Urbanowicz Samuel Urbanowicz
Author Profile Icon Samuel Urbanowicz
Samuel Urbanowicz
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Table of Contents (11) Chapters Close

Preface 1. Ranges, Progressions, and Sequences 2. Expressive Functions and Adjustable Interfaces FREE CHAPTER 3. Shaping Code with Kotlin Functional Programming Features 4. Powerful Data Processing 5. Tasteful Design Patterns Adopting Kotlin Concepts 6. Friendly I/O Operations 7. Making Asynchronous Programming Great Again 8. Best Practices for the Android, JUnit, and JVM UI Frameworks 9. Miscellaneous 10. Other Books You May Enjoy

Implementing a custom property delegate that provides lifecycle-aware values

Often, we need to declare a class property, which should depend on the lifecycle state of Activity or Fragment. In this recipe, we are going to employ both the Kotlin Lazy delegate and the Lifecycle class provided by the Android Architecture Components library (https://developer.android.com/topic/libraries/architecture/). We are going to implement a custom property delegate that will provide values in a lazy manner. This means that they are going to be instantiated only on the first call. Moreover, we are going to clear their values once Activity or Fragment gets destroyed. This will avoid memory leaks, which can be caused by managing properties dependent on the Context instance with the standard Lazy delegate.

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