Showing Error :Attempt to invoke interface method 'int java.util.List.size()' on a null object reference

Question

I\'m creating an app that display contact list in a listview.The problem is I\'m getting the following error when I run my app and I\'m struggling to fix it:

Answer 1

Extract this line

List contactModelList = new ArrayList<>();

before the try block and instead of return null; use return contactModelList;

Looks like your parsing fails and you pass a null object to onPostExecute().