如何让我的Contacts ContentObserver for ContactsContract检测添加，更新或删除的联系人？

I am able to get a generic notification "that there was a change to the contacts DB", but I want to know the specific record that was inserted, updated, or deleted. Following is the code that gets registered and gets the onChange notification. Unfortunately, it is not specific which makes my processing exhaustive and inefficient.I am able to get a generic notification "that t