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[DID YOU KNOW] that DAVdroid has advanced support for vCard4?

devvv4ever last edited by rfc2822
DAVdroid is one of the very rare Android CardDAV apps which have advanced support for vCard4. This means that (if your server supports it – for instance, KolabNow and Baïkal do) you gain
- native contact group support (KIND/MEMBER) without hacks
- native support for various properties (BDAY, IMPP, etc.)
- no more charset problems (vCard 4 is always UTF-8)
DAVdroid
- automatically detects whether vCard 4 is supported by the server (fallback: vCard 3)
  - detected by querying CARDDAV:supported-address-data property
- uses vCard 4 for uploading and downloading contacts:
  - GET with Accept: text/vcard;version=4.0
  - CARDDDAV:addressbook-multiget with <address-data content-type='text/vcard' version='4.0'/>
  - PUT with Content-Type: text/vcard;version=4.0
Sample vCard 4:

(red: some vCard4-specific properties)
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We have updated our FAQ page about contact groups because it seems that Android 8 has re-invented contact groups. In the screenshots, you can see how contact groups look on Google Contacts (default app) from Android 8 (SDK emulator) LineageOS 14.1 (Android 7.1.1) on a Samsung Galaxy S2 Android 4.4 on a Samsung Galaxy Note 10.1 DAVdroid supports “real” contact groups (introduced in VCard 4, but back-ported to VCard3 with vendor-specific properties), where the group is stored in a separate VCard and contains a list of all its members, and contact CATEGORIES (available in VCard 3, the minimum VCard version that has to be supported by a CardDAV server), where each contact is tagged with “categories”, which then form the contact groups. It’s important to choose the correct method (the one which is used by your server) when adding the DAVdroid account (see the Configuration pages; or you have to find out the method from the server manual or by trial). Almost all group operations are supported in both modes: At the end, it should be mentioned that Android (AOSP) has a bug that prevents contact group creation in the Contacts app for third-party contact providers like DAVdroid. We have created an AOSP bug report plus patch which allows creating groups for DAVdroid accounts. Unfortunately, our patch hasn’t even been looked at since Aug 6, 2014. LineageOS and OmniROM have integrated the patch to improve group support for external sync adapters like DAVdroid. With LineageOS 14.1, all group operations work well.

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[DID YOU KNOW] that DAVdroid has advanced support for vCard4?

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