I've created an Android app but a blind user wants to use it and has asked for it to support Talkback.
Thanks.
You could use AndroidTTS, Text to Speech.
All the details including the libraries used are here: Using Delphi, I'm trying to change the volume of the AndroidTTS, but I seem to keep getting the error "External exeception 1"
Even though I'm using Delphi 10.4.1, it should work fine for your version.
I would put my current working source codes here, but just found out they are too long for me to put them all here. Hopefully the article I supplied you will help you create your own working AndroidTTS package so you can supply a Text to Speech for your blind user.
I'll give my friend a copy of my working source code and see if he can put it up on his github. I'll later update this answer with the source code information. It's a holiday, and I doubt my friend will be updating his github today.