Android : How To Get Value From Multiple Checked Listview Item used Custom Adapter?

Api Which Used:

• Minimum Req SDK : API 8 - Android 2.2


• Target SDK : API 10 - Android 2.3.3


• Compile with : API 18 - Android 4.3

In Main Activity, contain ListView with CheckBox on it. and i am using Custom Adapter to populate the ListView from web service.

My Question is, How to get value from listview item which had multiple checked? So i can post it as array to web service.