code: public <V extends ViewGroup> void setTypeface(V viewGroup, @StringRes int strResId) {
  		setTypeface(viewGroup, mApplication.getString(strResId));
  	}
docs: Set the typeface to the all text views belong to the view group.
  Note that this method recursively trace the child view groups and set typeface for the text views.
  @param viewGroup the view group that contains text views.
  @param strResId string resource containing typeface name.
  @param <V> view group parameter.