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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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[DID YOU KNOW] that DAVdroid supports two-way sync of contact groups?
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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.
[DID YOU KNOW] that you can easily delete existing collections from inside the app?
DAVx⁵ • did you know • • devvv4ever

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Just long-tap an address book or calendar or task list. This will also delete your collection on the server side. You don’t have to log in to your server or service to just get rid of an unwanted calendar! .
[DID YOU KNOW] that you can create address-books, calendars and task lists with DAVdroid?
DAVx⁵ • did you know • • devvv4ever

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Just use the small menu icon at the top right of your address book / calendar and tasks overview. This will send a request to your server allowing you to easily create a collection of your choice. This works for address books, calendars and tasks (if the server supports it, which is not mandatory). The last two can be combined also. Please find some more details inside the image below on what field types are used by DAVdroid to create the collection.
[DID YOU KNOW] that you can restrict sync of DAVdroid even to a single WiFi SSID?
DAVx⁵ • did you know • • devvv4ever

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@devvv4ever I’m currently using this feature to limit synchronization to the local network, otherwise I get a lot of certificate warnings from e.g. captive portals. However, I can also VPN into my local network using some other network. I’d like DavDroid to synchronize in such situations as well. Is this doable? Thanks!
[DID YOU KNOW] DAVdroid can use HTTP/2 to improve performance and save traffic
DAVx⁵ • did you know • • rfc2822

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DAVdroid uses okhttp as an HTTP client, and okhttp is ready for HTTP/2. We’re trying to contribute to okhttp by submitting qualified bug reports, patches, components (Digest authentication handler) etc. Major HTTP/2 (RFC 7540) improvements (in comparison to HTTP/1.1): multiplexing of requests over a single TCP connection, thus saving costly TCP handshakes (= time and traffic), saving costly TLS handshakes (= time and traffic); more efficient message processing through binary message framing, compression of HTTP headers. In CalDAV/CardDAV context, it means that for synchronization of one collection, only one TCP/TLS handshake is required and HTTP headers are transferred compressed. (Body compression using gzip is also supported.) Many servers are supporting HTTP/2, for instance nginx 1.9.5+ and Apache 2.4.12+. Our Web sites, including this forum, support HTTP/2, too.

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

Maybe you're interested in these topics?

[DID YOU KNOW] that DAVdroid supports two-way sync of contact groups? DAVx⁵ • did you know • • devvv4ever

[DID YOU KNOW] that you can easily delete existing collections from inside the app? DAVx⁵ • did you know • • devvv4ever

[DID YOU KNOW] that you can create address-books, calendars and task lists with DAVdroid? DAVx⁵ • did you know • • devvv4ever

[DID YOU KNOW] that you can restrict sync of DAVdroid even to a single WiFi SSID? DAVx⁵ • did you know • • devvv4ever

[DID YOU KNOW] DAVdroid can use HTTP/2 to improve performance and save traffic DAVx⁵ • did you know • • rfc2822

[DID YOU KNOW] that DAVdroid supports two-way sync of contact groups?
DAVx⁵ • did you know • • devvv4ever

[DID YOU KNOW] that you can easily delete existing collections from inside the app?
DAVx⁵ • did you know • • devvv4ever

[DID YOU KNOW] that you can create address-books, calendars and task lists with DAVdroid?
DAVx⁵ • did you know • • devvv4ever

[DID YOU KNOW] that you can restrict sync of DAVdroid even to a single WiFi SSID?
DAVx⁵ • did you know • • devvv4ever

[DID YOU KNOW] DAVdroid can use HTTP/2 to improve performance and save traffic
DAVx⁵ • did you know • • rfc2822