How do you receive text into textbox?

Hello, how do we create an app which can take the output from another application like serial bluetooth terminal, and fill that text in textbox?
Is it possible to do so?
Part of my project is to take output text and convert it into text to speech.
I have initially tried establishing a connection from hc05 to MIT app but for some reason when i pair the hc05 it doesnt show the list of paired devices, thats y im trying this approach.