Скачать или смотреть Kotlin Android S1E4 : JSON Gridview - HTTP GET via HttpURLConnection

SOURCE CODE : http://camposha.info/kotlin-android/j...

Kotlin is a statically typed programming language that runs on the Java virtual machine and also can be compiled to JavaScript source code or use the LLVM compiler infrastructure.

Kotlin can do anything Java can including creating android apps. And in fact in this class we create an android app that downloads JSON data when a button is clicked, parses that data and renders the result in a custom gridview.

[JSON](https://www.json.org/) stands for JavaScript Object Notation.
It is a lightweight data-interchange format.
It is not only easy for humans to read and write but also easy for machines to parse and generate. That's why JSON is quite popular.

AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers.

We use AsyncTask in this class instead of raw threads. We will be downloading data in the background thread. Also we parse data in the background thread. AsyncTask will allow us do these while reporting progress using Progress Dialog.

HttpURLConnection is a URLConnection with support for HTTP-specific features. Through this class we will open a connection to a URL pointing us to JSON data and download that data.

We are basically making a HTTP GET request.

We use gridview in this case as our adapterview. Our programming language is Kotlin.