I would use a IME keyboard and add a banner above to select the emojis (= Scrollview with some labels filled with them to select/insert them). I do think that Manfred's lib wasn't mentioned to act like a full keyboard.
I did it, days ago.
Created a GUI similar to Whatsapp (the bottom part) using TabStripPageViewer, added labels, etc.); but then I was not able to manage the "special EditText" provided by the DonManfred's library, due to the lack of properites and events, as I said. Also, very likely I had other problems to solve the question, now I don't remember which (too many things to think of and too little brain memory
, but I have definitely reached a critical point that forced me to give up this method.).
This is the reason for my question; I have already tried many different ways.