code: public static SpannableString typeface(Context context, int strResId) {
  		if (sDefaultTypefaceCollection == null) {
  			throw new IllegalStateException("Default typeface collection not initialized. Forgot to call init()?");
  		}
  		return typeface(context.getString(strResId), sDefaultTypefaceCollection, Typeface.NORMAL);
  	}
docs: Return spannable string with default typeface style (style: Typeface.NORMAL)
  see: http://stackoverflow.com/questions/8607707/how-to-set-a-custom-font-in-the-actionbar-title
  
  @param context to obtain string resource
  @param strResId string resource id, content
  
  @throws IllegalStateException {@link #init(TypefaceCollection)} has not been called
  @return SpannableString that can be used in TextView.setText() method