How about Termux? It's a Linux shell with a package manager, so it isn't exactly an editor, but you can install both vim and Emacs on it. Couple that with "Hacker's Keyboard" and you're golden.
@WingmanJD @fdroidorg I know of none in the official repo, but there are a few in mine (Pascal N-IDE, ModPE, Enlightened), see this list: https://android.izzysoft.de/applists/category/named/office_office#group_105
@WingmanJD Termux plus vim ;)
Depend on what you want. If you want just to write in Markdown, I like Markor.
For code completion I use Shader Editor but there is not a lot of langage supported :/
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