DAVdroid 1.3 has been released

rfc2822

DAVdroid 1.3

use cert4android instead of MemorizingTrustManager for better integration of self-signed certificates (fixes hanging synchronization when the certificate has changed etc.)
add network security config to manifest so that user-installed CAs will be accepted in Android 7 again
new app-wide setting: distrust system certificates
accept intent extras (base url, user name, password) for login activity (for integration with Nextcloud app)
clean up permissions for account management
vcard4android: fix bug concerning generated formatted postal addresses
new launcher logo (thanks to @cj7christoph)
minor optimizations and bug fixes

rfc2822

DAVdroid 1.3.1

always use PROPFIND instead of REPORT addressbook-query to improve compatibility (for instance with Daylite)
cert4android: remove "unkown certificate" notification as soon as there are no more pending decisions
new translations (thanks to the contributors)

rfc2822

DAVdroid 1.3.2

General:

show progress bar when synchronization is active
minor bug/crash fixes and improvements

CalDAV:

retain unknown iCalendar (VEVENT/VTODO) properties (max. 25 kB)
query email address of user and use it as account name, if possible
increase SEQUENCE when an event exception is changed
only increase SEQEUENCE of events when we're ORGANIZER

rfc2822

DAVdroid 1.3.2.1

hotfix for event synchronization on Android <4.2
various Android 4.0/4.1 compatibility fixes
increased API level to 15 (Android 4.0.3) for TransactionTooLargeException

rfc2822

DAVdroid 1.3.2.2

fix HTTP/2 problems with OPTIONS
fix connection leaks

rfc2822

DAVdroid 1.3.3

authentication: always use UTF-8 instead of ISO-8859-1 for Basic credentials to implement RFC 7617
event sync: don't set event classification (CLASS:PRIVATE) when "privacy" is "default"
contact sync: remove "disable RFC 6868" option (RFC 6868 is now always enabled)
task sync: ignore invalid DUE values which are before DTSTART
minor bug fixes and improvements (including internal refactoring, Android JUnit4 tests and Gitlab CI)

The new UTF-8 encoding for authentication allows you to use passwords with non-ASCII special characters (Umlauts etc.) with several servers/services, including

Nextcloud,
OwnCloud,
MyKolab,
Fruux, and
GMX.

Posteo: the "disable RFC 6868" account setting is not needed anymore.

rfc2822

Version 1.3.3.1

Core:

share debug info: always use attachment (before: send inline if it was small enough)
use FileProvider for debug info attachment (for Android 7 compatibility)
new translations

dav4android:

rewrite authentication scheme parameters to lower case (to accept "Realm" as well as "realm")
disable compression for GET requests because it may change the ETag

vcard4android:

better handling for empty FN/N (for instance, organization-only contacts without structured name)

ical4android:

upgrade to ical4j 2.0.0-rc2

rfc2822

Version 1.3.4

davdroid:

add app-wide HTTP proxy setting
debug info: send inline on Android <4.1 and when creating an attachment doesn't work

ical4android:

upgrade to ical4j 2.0 final
ignore DTSTART instead of DUE if DTSTART > DUE
better handling of events without DTEND/DURATION
handle TransactionTooLargeException correctly when a single operation is too large

vcard4android:

handle TransactionTooLargeException correctly when a single operation is too large
rescale photos when they're bigger than ContactsContract.DisplayPhoto.DISPLAY_MAX_DIM
before inserting them into the Android contact provider

rfc2822

Version 1.3.4.1

allow renaming of accounts (as far as possible)
various bug fixes

rfc2822

Version 1.3.5

contact sync bug fix: contacts were always downloaded from beginning until there was a successful sync
ical4android: use the same ORGANIZER for all VEVENT components
minor improvements and bug fixes
gradle/okhttp upgrade
new translations (thanks to all translators!)

rfc2822

DAVdroid 1.3.6

Core:

better detection of whether OpenTasks is installed or not (fixes Android 7 phantom sync entries)
automatically enable/disable task sync when OpenTasks is (un)installed
fix "permissions required" notification
update to SDK level 25 (Android 7.1.1)

CalDAV:

remove ORGANIZER from all VEVENT components if there are not attendees

CardDAV:

update to ez-vcard/0.10.1
improve parsing of uncommon REV/timestamp formats (fixes current Nextcloud/OwnCloud Contacts problems)
ignore invalid PREF values

rfc2822

DAVdroid 1.3.7

delete local contacts at sync when no CardDAV collection is selected
change authentication restriction to domain instead of host name (fixes missing authentication when downloading iCloud images)

If you're experiencing some missing photos when using iCloud (or other services which store photos as external authenticated downloads on the same domain, but other hosts):

update to DAVdroid 1.3.7
unselect the address book in the DAVdroid account
force sync in the DAVdroid account → all local contacts are now removed
select the address book in the DAVdroid account again
force sync in the DAVdroid account again → all contacts will be downloaded again, now with photo

rfc2822

Version 1.3.7.1

Hotfix: workaround for "contacts/calendar sync not available" on buggy firmware

If you're affected by this problem:

Uninstall DAVdroid
Install DAVdroid 1.3.7.1
Set up the account(s) again

rfc2822

Version 1.3.8

added verbose information about current local and remote resource to debug info (helps to find faulty contacts/events, for instance when they're not parseable)
new translations, which also fix a crash in the Spanish version