code: public void setTypeface(Activity activity, @StringRes int strResId, int style) {
  		setTypeface(activity, mApplication.getString(strResId), style);
  	}
docs: Set the typeface to the all text views belong to the activity.
  Note that we use decor view of the activity so that the typeface will also be applied to action bar.
  @param activity the activity.
  @param strResId string resource containing typeface name.
  @param style the typeface style.