How to change letter spacing in a Textview?
Since API 21 there is an option set letter spacing. You can call method setLetterSpacing or set it in XML with attribute letterSpacing.
check out android:textScaleX
Depending on how much spacing you need, this might help. That's the only thing remotely related to letter-spacing in the TextView.
Edit: please see @JerabekJakub's response below for an updated, better method to do this starting with api 21 (Lollipop)