Does the Android app support encryption at all? The assistant allows me to create encrypted repositories but it just keeps telling me to install git-remote-gcrypt, which did not work.
Encrypted special remotes are supported just fine on Android.
As for storing the encrypted git repository itself on a remote, which is what git-remote-gcrypt is used for, it would need porting that to Android. I don't think that should be very hard (it's just a rather complicated shell script and all the tools it uses are already included in the git-annex bundle). I may eventully end up reimplementing git-remote-gcrypt as part of git-annex in Haskell, since porting it to eg, Windows is likely to be a lot harder..