In Chapter 4, which covered content providers, we listed the benefits of exposing data through content provider abstraction and showed that such abstracted data is exposed as a series of URLs that can be used to read, query, update, insert, and delete. These URLs and their corresponding cursors become the API for that content provider.
The Contact API is one such content provider API for working with the contact data. Contacts in Android are maintained in a database and exposed through a content provider whose authority is rooted at
The Android SDK documents the various contracts offered by this contact content provider using a set of java interfaces and classes that are rooted ...