public void setSectionItemSelected(int sectionIndex, int itemIndex, boolean selected) {
        SectionSelectionState state = getSectionSelectionState(sectionIndex);

        if (state.section) {
            return;
        }

        if (selected != state.items.get(itemIndex)) {
            state.items.put(itemIndex, selected);
            notifySectionItemChanged(sectionIndex, itemIndex);
        }
    }
Select a specific item in a section. Note, if the section is selected, this is a no-op.

@param sectionIndex index of section
@param itemIndex    index of item, relative to section
@param selected     selection state
android/modules/module_common/src/main/java/github/tornaco/android/thanos/widget/section/SectioningAdapter.java