Kotlin AsyncTask Tutorial with Example

Here is an example of implementing AsyncTask in Kotlin. I will create an Android application project in order to implement AsyncTask class. AsyncTask class allows us to perform some tasks in the background without blocking the main thread. AsyncTask is used for short background operations. It also allows us to update the GUI elements in the main thread. Implementing AsyncTask in Kotlin is similar as we do in java.

How to implement AsyncTask in Kotlin Android Application

Create a new project in Android Studio and name it KotlinAsyncTutorial with default settings.

If you have the Android Studio version below 3.0, you need to download the Android Studio 3.0 from below link. Android Studio 3.0 has the built-in support for Kotlin. I m using Preview version at this time. It will be available as stable version soon.

Download Android Studio 3.0 (Preview Version)

This is how my project structure looks like

kotlin asynctask example

Add internet permission in AndroidMenifest.xml file

First of all, We will create a simple layout for our application. Open your activity_main.xml and add the below code into it. The layout is very simple. It has TextView, Button, and ProgressBar.

We will execute AsyncTask on button click, display the ProgressBar while background processing is in progress and then we will display the response from the server in TextView.

activity_main.xml

Now, We will add some code in the MainActivity class file. Open your MainActivity.kt and add the below code into it.

Implementing setOnClickListener on Button in Kotlin

By importing this package, we can get rid of findViewById

It is very simple to implement setOnClickListener in Kotlin. CallBtn is the ID of Button view

Download Source Code

We are done with coding. Run the application into emulator or any Android device.

AsyncTask Kotlin Tutotrial – Video Demo

You can see the project structure and application demo in the below video

I hope you would like this tutorial and learn something useful out of it. If you have any question, you can ask in the comment section.

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