in my android app i want to change font of my textView programatically through preferences and allow users to choose between 100's of fonts code example

Example: How to chage font progrmatically

TextView tv = (TextView) findViewById(R.id.appname);
Typeface face = Typeface.createFromAsset(getAssets(),
            "fonts/epimodem.ttf");
tv.setTypeface(face);