DavMail should work by now, see #477. Make sure to use the latest version of DavMail and DavDroid.
No way to add shared calendar with davical
davdroid (0.8), davical (git)
user2 is shared to user1 (user1 has all permissions)
As I see, there is no way to add user2 calendar to davdroid using user1 credentials. Davdroid suggests only user1 calendars/addressbooks, even if URL is filled with “server/caldav.php/user2” . I think before trying well-known URLs, davdroid should check the exact URL for existing profiles.
Thanks for your report. This is a duplicate of #249, please follow up there.