I wanted to write kannada alphabet/word on top of the button instead of english. I have stored an kgp_kbd.ttf in my assets folder. I am getting an white boxes on top of buttons.
You cannot do that if your device does not have support for that font built in. Even if you give TypeFace the support for those fonts is needed, else it will show boxes like that. You can put those fonts in system's fonts directory if your device is rooted.