How to Add checked value in a List from Custom List-view in Android?

I am working on a Call Blocker app. I want to add contact numbers from phone Contacts to Sqlite database for further processing.

I have an activity CutomListview(with checkbox) with a Add button on It.

Contacts are accessed in custom ListView(check box working perfectly).

Now in "OnClick" methoed for add button. i only want to add checked items of Custom ListView in a list or array list for further database code?