@NonNull
        public String toString() {
            return "[" + type + "]" + (type == ListItemType.GROUPHEADER ? itemGroup.getGroup() : value) + "(visible: " + isVisible + ")";
        }
This view displays and maintains a list of simple view items, mainly for (single or multiple)
item selection lists. It provides special support for grouping, filtering and "select all" for such
lists.
main/src/main/java/cgeo/geocaching/ui/SimpleItemListView.java