如何使用Android中的异步任务通过阵列列表更新列表视图？

I am following the Earthquake app from udacity.com . I am stuck in updating the view after the json parsing using async task .After getting the arraylist object in onPostExecute method for doInBackground method i don't understand how to update the view, my app screen comes blank every time, i have a custom word adaptor class with some text view and a list view This is the code of EarthquakeActivity.java classI am following the Earthquake app from udacity.