@Override
    protected String getTextElement(Integer currentSection, INameableAdapter adapter) {
        Character provided = adapter.getCharacterForElement(currentSection);
        return String.valueOf(Character.toUpperCase(provided));
    }
Indicator which should be used when only one character will be displayed at a time.
lib/src/main/java/com/turingtechnologies/materialscrollbar/AlphabetIndicator.java