It doesn’t sync the information every time but at least the ETag (hash) for every iCal.
Partial syncs will be a very challenging task, but I will have a look at it when other things are stable.
Is it planned to add Event support (birthdays, etc.) to contact syncing?
Edit: it seems the notes field is not being synced either.
everything listed here: http://davdroid.bitfire.at/more should be synchronized at the moment. We’re planning to support more fields in future releases!
Please add birthdays!
Generally, whats blocking more fields? Do you consider it to be simple for s/o else to write a patch adding them?
I have added support for birthdays with commit 6ee010905e172164b865c0e9c0576d92d1ae7906, but I can’t test it because my Android 4.1 and lower devices don’t show the birthday anyways. Closing this as duplicate of issue #5, please post there.
Generally, it’s possible to sync all properties listed here: https://developer.android.com/reference/android/provider/CalendarContract.html
But it depends on the Android version, and often its not possible to translate the Android values 1:1 to vCard values.