Any alternative to the Calligraphy library to change the font for an entire Android app?

Answer 1

google play has various apps to change the font

Answer 2

Now you've described it better, I hope someone can help you with this.

Answer 3

But you cannot use them while you are building an app. This question is in regard to android application development. I'm looking for a library or any code that can be used to change the font for my app. not an app to change the font for my device. thanks.