Question

If I target my Android app for version x, will it have any problems if the user uses an Android version above x?

What will I have to watch out for?

Answer 1

Yes, it’s should work.

Updates to the framework API are designed so that the new API remains
compatible with earlier versions of the API. That is, most changes in
the API are additive and introduce new or replacement functionality.
As parts of the API are upgraded, the older replaced parts are
deprecated but are not removed, so that existing applications can
still use them. In a very small number of cases, parts of the API may
be modified or removed, although typically such changes are only
needed to ensure API robustness and application or system security.
All other API parts from earlier revisions are carried forward without
modification.

Take a look at this