深入解析Android日历源码：揭秘系统日历的运

随着智能手机的普及，Android系统已经成为全球最受欢迎的移动操作系统之一。在Android系统中，日历应用是用户日常生活中不可或缺的一部分。本文将深入解析Android日历源码，带您了解系统日历的运作原理。

一、Android日历简介

Android日历应用是一款基于Google Calendar服务的应用程序，它允许用户查看、添加、编辑和删除日历事件。日历应用不仅提供了日历视图、月视图、周视图和事件列表视图，还支持事件提醒、日历同步等功能。

二、Android日历源码结构

Android日历源码位于Android开源项目（AOSP）的“calendar”目录下。该目录主要包含以下几个部分：

1.日历数据存储：主要包括日历数据表（CalendarContract）和事件数据表（EventContract）。

2.日历数据访问：主要包括CalendarProvider类，负责提供对日历数据的访问。

3.日历视图：主要包括CalendarView、MonthView、WeekView等类，负责展示日历视图。

4.日历事件处理：主要包括EventInfo类，负责处理日历事件。

5.日历提醒：主要包括AlarmManager类，负责设置和取消事件提醒。

6.日历同步：主要包括SyncAdapter类，负责与Google Calendar服务同步。

三、Android日历源码解析

1.日历数据存储

在Android系统中，日历数据存储主要依赖于SQLite数据库。CalendarContract类定义了日历数据表的结构，包括日历账户（CalendarContract.Calendars）、日历事件（CalendarContract.Events）等。

以日历账户为例，其结构如下：

` CREATE TABLE calendars ( id INTEGER PRIMARY KEY, accountname TEXT NOT NULL, accounttype TEXT NOT NULL, displayname TEXT NOT NULL, color INTEGER NOT NULL, visible INTEGER NOT NULL, selected INTEGER NOT NULL, maxreminders INTEGER NOT NULL, alertlevel INTEGER NOT NULL, syncevents INTEGER NOT NULL, owner INTEGER NOT NULL, calendaraccess INTEGER NOT NULL, calendarcolorid INTEGER NOT NULL, calendarid TEXT NOT NULL, calendarvisible INTEGER NOT NULL, calendarsourceid INTEGER NOT NULL, calendarsourcetype INTEGER NOT NULL, calendardisplayname TEXT NOT NULL, calendarowneraccountname TEXT NOT NULL, calendarowneraccounttype TEXT NOT NULL, calendarownerdisplayname TEXT NOT NULL, calendarownerentitytype INTEGER NOT NULL, calendarownerentityid TEXT NOT NULL, calendarownerisprimary INTEGER NOT NULL, calendarsourceowneraccountname TEXT NOT NULL, calendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownerentityid TEXT NOT NULL, calendarsourceownerisprimary INTEGER NOT NULL, calendarsourcedisplayname TEXT NOT NULL, calendarsourcetype TEXT NOT NULL, calendarsourceowneraccountname TEXT NOT NULL, calendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownerentityid TEXT NOT NULL, calendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceid INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourcetype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceowneraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerdisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentitytype INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerentityid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownerisprimary INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarid TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccountname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccounttype TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendardisplayname TEXT NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarcolor INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarvisible INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendaraccess INTEGER NOT NULL, calendarsourceownercalendarsourceownercalendarsourceownercalendarsourceownercalendarsource