Please accept YouTube cookies to play this video. By accepting you will be accessing content from YouTube, a service provided by an external third party.

YouTube privacy policy

If you accept this notice, your choice will be saved and the page will refresh.


Show the video description

In this video we will learn, how to use the AsyncTask class, which makes it easier to do operations on a background thread and publish the results on the UI/main thread, without having to manipulate threads and handlers ourselves.
For this we will subclass Asynctask, define 3 generic types for the params, the progress and the result and override 4 methods:
onPreExecute, where we do preparations on the UI thread, doInBackground where we do the heavy work on a background thread, onProgressUpdate where we publish the progress to the UI thread (for example to a ProgressBar), and onPostExecute where we get back the result from the background task.
In order to not leak memory by holding onto a strong reference to our MainActivity, we will make the AsyncTask static and keep a WeakReference to our Activity.