If you're on the main thread, you should use that to display the ProgressDialog and spin off another thread for getMostWanted() . Assuming you want the ending of getMostWanted() to dismiss the dialog, you should look at AsyncTask.
Amin is correct that a good way to approach the problem is with an AsyncTask, although his implementation doesn't quite fit your needs. You would create your dialog in onPreExecute(), and remove it in onPostExecute().
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