edited:
I don't believe it's possible to change the actual stroke used on the text, the best closest option you probably have is to use a different font.
In android you can "draw" any text using any *.ttf font.
for that you must include the file in your assets folder and call from code (maybe there's a way using XML, but I don't know how) this:
TypeFace mFont = TypeFace.createFromAsset(mContext.getAssets(), "my_font.ttf");
mTextView.setTypeFace(mFont);
I reckon that is the closes you'll get to have a different stroke on the text.
original answer:
TextView have the following properties:
Drawable Top
Drawable Bottom
Drawable Left
Drawable Right
that you set on the XML. Or you can call
setCompoundDrawables(left, top, right, bottom)
from code!