与 Google 日历同步活动
我正在编写一项需要用户日历上的最新信息的服务。然而，除了定期轮询之外，我还没有找到其他方法来接收来自 GCal 的更新。是否可以设置某种推送通知或事件列表差异传输？
I'm writing a service that needs an up-to-date information on a user's calendar. However, I have yet to find a way other than regular polling to receive updates from GCal. Is it possible to set up some kind of push notification or an event list diff transmission?
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（免责声明：我在 Google 工作，负责 Google Mobile Sync，特别是日历同步，但在这个答案以及我在这个网站上写的所有其他内容中，我是以个人身份撰写的，并不代表 Google。）
恐怕我相信有一个公共通知 API。据我所知，您需要进行民意调查。但是，您当然可以要求自特定时间戳以来进行更改；您不必每次都下载整个日历。
其次：祝你好运！在我开始研究日历之前，我当然没有意识到日历有多么复杂......
(Disclaimer: I work for Google, and I worked on Google Mobile Sync, specifically calendar sync, but in this answer and everything else I write on this site, I am writing as an individual and not representing Google.)
I don't believe there's a public notification API, I'm afraid. As far as I'm aware, you will need to poll. However, you can of course ask for changes since a particular timestamp; it's not like you have to download the whole calendar every time.
On a secondary note: good luck! I certainly didn't appreciate just how complicated calendaring was until I started working on it...