Handler vs AsyncTask

Question

I\'m confused as to when one would choose AsyncTask over a Handler. Say I have some code I want to run every n seconds which will update the UI. Why would I choose one ove

Answer 1

IMO, AsyncTask was written to provide a convenient, easy-to-use way to achieve background processing in Android apps, without worrying too much about the low-level details(threads, message loops etc). It provides callback methods that help to schedule tasks and also to easily update the UI whenever required.

However, it is important to note that when using AsyncTask, a developer is submitting to its limitations, which resulted because of the design decisions that the author of the class took. For e.g. I recently found out that there is a limit to the number of jobs that can be scheduled using AsyncTasks.

Handler is more transparent of the two and probably gives you more freedom; so if you want more control on things you would choose Handler otherwise AsynTask will work just fine.

Answer 2

doInBackground - basically does work in another thread. onPostExecute - posts the results on the UI thread and it is internally sending message to handler of main thread. Main UI thread already has a looper and handler associated with it.

So basically,if you have to do some background task,use AsyncTask. But ultimately,if something needs to be updated on UI,it will be using main thread's handler.