APG (Android Privacy Guard)
APG originally brought email encryption to the Android platform.
In recent years the project has fallen asleep, but a lot of great work has been done in OpenKeychain, which is a fork of APG and it has a much more active and well managed development community.
I recommend using OpenKeychain and to post any feature requests on their github repository. Bugs in the APG app likely have been fixed there already.
I'm going to close all issues on this repository. Thank you for the support and interest in APG!