It is good practice to not do computation intensive work on the UI Thread. In fact starting from HoneyComb, you get a NetworkOnMainThread exception if you try and do any network processing on the main thread. So we should do background work in a new thread. One thing we need to consider is that only the UI thread can update the UI, so when our background thread wants to update the UI, we need a means to communicate between threads. Actually even your background thread can update the UI, but this is really dangerous and your app can crash! Android provides a lot of multi threading constructs for us. AsyncTask is by far the easiest way of multithreading in Android. When you create a new AsyncTask object the framework creates a new thread for you and provides methods to communicate with the UI. No threads, no handlers and no Executors (Because it uses these classes internally)! So why not use AsyncTask all the time? Well, because these are suited for background work that typically l...
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