public String getFormulaText() {
            if (StringUtils.isBlank(text)) {
                return "_";
            }
            if (text.length() == 1) {
                return text;
            }
            return "(" + text + ")";
        }
The actual button used for the most part
main/src/main/java/cgeo/geocaching/ui/CalculatedCoordinateInputGuideView.java