Question

我的应用需要将信息与日历事件相关联。为此，它需要每个事件的持久ID，以便它可以在时间发生变化时跟踪事件或检测事件何时被删除。

此外，我想要一个日历本地的ID，而不仅仅是特定设备上的唯一ID，因此如果我的应用程序在另一个Android设备或其他平台上运行，它会很有用。

我看过_ID和_SYNC_ID。看起来它们在特定设备上只是唯一且持久的，而不是跨设备。我想要的密钥是本机事件密钥，来自它所属的日历。例如，对于Outlook事件，我认为我想要Outlook的关键。

Calendar api中是否提供了这样的密钥？如果没有，无论如何都要获得我正在寻找的本机密钥？

感谢。

Answer 1

我可以告诉你，Event_ID和你一样持久。它是PK，因此除非在删除行之后重用PK，否则它应该是可靠的。唯一的例外是用户清除日历数据库和重新同步。在这种情况下，我认为，所有的PK都将是全新的。

以下是CalendarDatabaseHelper.java的一些源代码，显示Event._ID是PK：

   db.execSQL("CREATE TABLE Events (" +
            "_id INTEGER PRIMARY KEY," +
            ACCOUNT_NAME + " TEXT," +
            ACCOUNT_TYPE + " TEXT," +
            "_sync_id TEXT," +
            "_sync_version TEXT," +
            "_sync_time TEXT," +            // UTC
            "_sync_local_id INTEGER," +
            "_sync_dirty INTEGER," +
            "_sync_mark INTEGER," + // To filter out new rows
            "calendar_id INTEGER NOT NULL," +
            "htmlUri TEXT," +
            "title TEXT," +
            "eventLocation TEXT," +
            "description TEXT," +
            "eventStatus INTEGER," +
            "selfAttendeeStatus INTEGER NOT NULL DEFAULT 0," +
            "commentsUri TEXT," +
            "dtstart INTEGER," +               // millis since epoch
            "dtend INTEGER," +                 // millis since epoch
            "eventTimezone TEXT," +         // timezone for event
            "duration TEXT," +
            "allDay INTEGER NOT NULL DEFAULT 0," +
            "visibility INTEGER NOT NULL DEFAULT 0," +
            "transparency INTEGER NOT NULL DEFAULT 0," +
            "hasAlarm INTEGER NOT NULL DEFAULT 0," +
            "hasExtendedProperties INTEGER NOT NULL DEFAULT 0," +
            "rrule TEXT," +
            "rdate TEXT," +
            "exrule TEXT," +
            "exdate TEXT," +
            "originalEvent TEXT," +  // _sync_id of recurring event
            "originalInstanceTime INTEGER," +  // millis since epoch
            "originalAllDay INTEGER," +
            "lastDate INTEGER," +               // millis since epoch
            "hasAttendeeData INTEGER NOT NULL DEFAULT 0," +
            "guestsCanModify INTEGER NOT NULL DEFAULT 0," +
            "guestsCanInviteOthers INTEGER NOT NULL DEFAULT 1," +
            "guestsCanSeeGuests INTEGER NOT NULL DEFAULT 1," +
            "organizer STRING," +
            "deleted INTEGER NOT NULL DEFAULT 0," +
            "dtstart2 INTEGER," + //millis since epoch, allDay events in local timezone
            "dtend2 INTEGER," + //millis since epoch, allDay events in local timezone
            "eventTimezone2 TEXT," + //timezone for event with allDay events in local timezone
            "syncAdapterData TEXT" + //available for use by sync adapters
            ");");

是否存在日历事件的持久密钥

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