public void setLabelMapper(final Func1<Float, String> labelMapper) {
        this.labelMapper = labelMapper;
        redesign();
    }
View displays and maintains a slider where user can select single or range of items from a sorted item list.
Tapping on a thumb allows manual value input
main/src/main/java/cgeo/geocaching/ui/ContinuousRangeSlider.java