Mime type for .txt files?

You can try the specific mime:

text/plain

or, the more general text mime:

text/*

android text-files share mime-types

simple and complete example code (less than 50 lines) for app that android will present to the user along with menu list of compatible apps (polaris, browser, etc) when opening a TXT file.

disclaimer: in case user hasnt previously determined a default app

note; TXT may be changed, you can customize your extensions, if you generate the files that your app consumes.

CodeHunter