OpenKeychain is great for keys on Android. It's FOSS and available on FDroid. +1 for using a self hosted Nextcloud instance to keep things in sync.
this post was submitted on 27 Jun 2023
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I keep my keys on a Yubikey. I've not really had a need to use the GPG portion of this on Android, but it works fine on Linux and MacOS.
I used this guide: https://github.com/drduh/YubiKey-Guide
keep them in my NC and just import them to thunderbird
Sounds like a good idea, and was considering it. But curious if there is other or better ways.
That's an interesting dilemma when you bring up Android. I have always considered android device as a hardware compromised device and that it shouldn't be used for highly confidential data to an extent that you might be using PGP/GPG for.
But you could have all of your PGP/GPG centrally managed on a Linux system with android device having it's own unique keypair that is signed by your root PGP/GPG keypair on your Linux system. As for software for managing GPG/PGP on Linux system, I just simply use KGPG which does the job plenty well. If you have to use PGP/GPG on Android Phone, then I recommend sticking with f-droid repository for PGP/GPG key management app, not Google Play Store.
OpenKeychain Package on F-droid
Few use-cases for GPG/PGP on android is encrypting email or chat, but application integration is limited to select few software like K-9 Mail or Conversations.
--Edited to add--
Why the heck did server spam duplicates of my comments? :(