A Contact (according to the user) is an aggregate set
RawContact <A RawContact are some of the details associated with a particular account or protocol.
ContactsContract.Contacts.CONTENT_URI, , , RawContacts
RawContacts.CONTENT_URI , [] , /
/ .
, , , , / , . , ContactsContract.
, "". URL-, , , , , , , , , , - , notifyDataSetChanged!