Book Image

Learning Concurrency in Kotlin

By : Miguel Angel Castiblanco Torres
Book Image

Learning Concurrency in Kotlin

By: Miguel Angel Castiblanco Torres

Overview of this book

Kotlin is a modern and statically typed programming language with support for concurrency. Complete with detailed explanations of essential concepts, practical examples and self-assessment questions, Learning Concurrency in Kotlin addresses the unique challenges in design and implementation of concurrent code. This practical guide will help you to build distributed and scalable applications using Kotlin. Beginning with an introduction to Kotlin's coroutines, you’ll learn how to write concurrent code and understand the fundamental concepts needed to write multithreaded software in Kotlin. You'll explore how to communicate between and synchronize your threads and coroutines to write collaborative asynchronous applications. You'll also learn how to handle errors and exceptions, as well as how to work with a multicore processor to run several programs in parallel. In addition to this, you’ll delve into how coroutines work with each other. Finally, you’ll be able to build an Android application such as an RSS reader by putting your knowledge into practice. By the end of this book, you’ll have learned techniques and skills to write optimized code and multithread applications.
Table of Contents (11 chapters)

Channels in action

It's about time for us to actually use channels on our RSS Reader. In this chapter, we will add a new search feature to it, and will use channels to search all the outlets that we have configured at once.

Adding a search activity

First, let's copy the layout file activity_main.xml and name that copy activity_search.xml:

Once that is done, let's create a new Kotlin file, and name it SearchActivity:

Now we will create an activity inside that file. Initially, we want it to simply inflate the layout that we just created:

class SearchActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {