Has been fixed with ical4j/2.0.5 and ical4android/929555e0.
DAVdroid > 220.127.116.11-ose compatibility issue
On Android 4.0.3, the last working version of DAVdroid is 18.104.22.168-ose. I’ve tried 1.6.2-ose and 1.6.3-ose and both make android freeze when trying to sync.
v22.214.171.124 is doing the job anyway, thanks for your work.
See DAVdroid 1.6.3 release notes: Android 4.1 is required now