AsyncTask in android 3.1.3 for background work/Task

Android AsyncTask is an abstract class provided by Android which gives us the liberty to perform heavy tasks in the background and keep the UI thread light thus making the application more responsive.

Android application runs on a single thread when launched. Due to this single thread model tasks that take longer time to fetch the response can make the application non-responsive. To avoid this we use android AsyncTask to perform the heavy tasks in background on a dedicated thread and passing the results back to the UI thread. Hence use of AsyncTask in android application keeps the UI thread responsive at all times
The basic methods used in an android AsyncTask class are defined below :

doInBackground() : This method contains the code which needs to be executed in background. In this method we can send results multiple times to the UI thread by publishProgress() method. To notify that the background processing has been completed we just need to use the return statements
onPreExecute() : This method contains the code which is executed before the background processing starts
onPostExecute() : This method is called after doInBackground method completes processing. Result from doInBackground is passed to this method
onProgressUpdate() : This method receives progress updates from doInBackground method, which is published via publishProgress method, and this method can use this progress update to update the UI thread

The three generic types used in an android AsyncTask class are given below :

Params : The type of the parameters sent to the task upon execution
Progress : The type of the progress units published during the background computation
Result : The type of the result of the background computation

Asynctask in Android -Theory | Android Tutorial for Beginner

In this video we will see the Theory of AsyncTask in Android

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.
An asynchronous task is defined by 3 generic types, called Params, Progress and Result, and 4 steps, called onPreExecute, doInBackground, onProgressUpdate and onPostExecute.

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184 Android AsyncTask Example |

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This Android Tutorial shows an example of AsyncTask where a ListView is populated with items in the background thread supported by the doInBackground method. The onPreExecute and onPostExecute take care of displaying and hiding a progress bar that belongs to the Activity enabled through the requestWindowFeature method. The publishProgress and onProgressUpdate attempt to update the progressbar

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