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If you're serious about wanting to deal with plaintext on Android, I recommend installing Termux and learning how to use the Nano text editor (via Termux). Here are some links to help you get started there. Also, I recommend getting a bluetooth keyboard.

Okay, so once you have Termux installed, you basically have a Linux command-line app; no GUI, but you don't really need one terribly. You can install and use all sorts of programs that make your tablet useful--and you can make your own, if you're a programmer. As an added bonus, both Termux and Nano make it easy to multi-task once you learn how (in Termux ctrl+alt+c makes a new terminal; ctrl+alt+up/down moves between them; in Nano, you can move between open text files with alt+left/right).

So, in Linux, to create a text file, you can do it plenty of ways:

  1. touch myFile.txt (that will create it if it's not there)
  2. Type nano myFile.txt edit it, and save it.

Stuff like that. Learning how to use the Linux command-line will be important if you take this approach. You'll want to know commands like this:

  • ls to show the contents of the current working directory
  • cd myDirectory to change the directory to myDirectory
  • Follow just about any command with --help (e.g. nano --help) to learn more about how to use it. man whatEverMyCommandIs also helps (it opens the manpage for it, if available).
  • rm myfile to delete a file
  • rm -r myDirectory to delete a directory/folder
  • mkdir myDirectory to make a new directory
  • chmod +x myFile to make a file executable
  • ./myExecutableFile to run an executable file that is in the current directory.
  • exit to exit the shell (note you can type bash to create a new one running inside of the current one, so if you exit, you'll return to the old one)
  • pkg install myApp to install a program called myApp (if it exists in the package manager); I don't remember if Nano comes pre-installed; if it doesn't, type pkg install nano.
  • ctrl+c and ctrl+z are useful if you need to force quit a running program.
  • Press tab to autocomplete stuff you're typing (like file and directory names).
  • If you can't find a program for your purpose, see if someone has made one with Python; Python works on Termux, and so does pip (so, you've got access to lots of stuff).

There are more Termux-related apps on F-Droid, if you want to be able to do even more stuff with that.