code: public <F extends android.support.v4.app.Fragment> void supportSetTypeface(F fragment, String typefaceName, int style) {
  		View root = fragment.getView();
  		if (root instanceof TextView) {
  			setTypeface((TextView) root, typefaceName, style);
  		} else if (root instanceof ViewGroup) {
  			setTypeface((ViewGroup) root, typefaceName, style);
  		}
  	}
docs: Set the typeface to the all text views belong to the fragment.
  Make sure to call this method after fragment view creation.
  And this is a support package fragments only.
  @param fragment the fragment.
  @param typefaceName typeface name.
  @param style the typeface style.