In this post I will show you how to setup your android to sync with the nextcloud.
The idea is to be able to see the NextCloud calendar appointments on the Adroid device and be able to add new ones on it.
Since adding CalDAV (calendar) and CardDAV (contacts) to android is not supported nativley you will have to install a 3rd party tool. I choose to use the open source tool DAVdroid for that.
If you have a few bucks to spare, are lazy or both please buy the app in the app store and support the developers.
(If you do, you can skip the first 6 steps)
Since DAVdroid is open source you can get the app for free. This is how you get the apk.
Cheers, Ori