1. Calendar Provider

　　The Calendar Provider is a repository for a user‘s calendar events. The Calendar Provider API allows you to perform query, insert, update,

　　　　and delete operations on calendars, events, attendees, reminders, and so on.

2. Basics

　　The content providers offered by the Android platform (including the Calendar Provider) typically expose data as a set of tables based on a

　　　　relational database model, where each row is a record and each column is data of a particular type and meaning. Through the Calendar

　　　　Provider API, applications and sync adapters can get read/write access to the database tables that hold a user‘s calendar data.

　　Every content provider exposes a public URI (wrapped as a Uri object) that uniquely identifies its data set.

　　A content provider that controls multiple data sets (multiple tables) exposes a separate URI for each one.

　　All URIs for providers begin with the string "content://". This identifies the data as being controlled by a content provider

　　The Calendar Provider defines constants for the URIs for each of its classes (tables). These URIs have the format <class>.CONTENT_URI.

　　　　For example, Events.CONTENT_URI.

3. User Permissions

　　 <uses-permission android:name="android.permission.READ_CALENDAR" />    <uses-permission android:name="android.permission.WRITE_CALENDAR" /> 

4. calendars Table

　　4.1 Querying a calendar

　　4.2 Modifying a calendar

　　4.3 Inserting a calendar

2.App Components-Content Providers/Calendar Provider