问题
In how to retrieve the list of contacts in android I see code that allows you to read contacts using either ContactsContract.CommonDataKinds.Phone.CONTENT_URI or ContactsContract.Contacts.CONTENT_URI.
What is the difference between them?
When can they be different?
回答1:
Use ContactsContract.Contacts to query just Contacts and ContactsContract.CommonDataKinds.Phone can be used to query for details like Phone Numbers if you have the ID of a contact.
Be sure to add .CONTENT_URI at the end of the Constant and check the documentation for more information.
来源：https://stackoverflow.com/questions/28558849/contactscontract-commondatakinds-phone-content-uri-vs-contactscontract-contacts