Android app with its own keyboard

I'm working on an application that deals with the ancient language "Coptic language" (not included in the Android keyboard language), so how do I make a dedicated keyboard for the application?

resolvent:

Well, there are some problems around it. But usually you have to be able to do it

Recently, I encountered a similar problem in my question

First, you need to make sure that the input method is set to the corresponding textview. Or keep it as the service to be set in the system settings. The first option is better. However, of course, there is a limitation. Under this specific view, users will not be able to use any other keyboard they like

Secondly, for the specific implementation, you can see this tutorial

I hope this will help

Postscript there is also a Hacky way, but it is not recommended