public void setItemExpandCollapseListener(
			OnItemExpandCollapseListener listener) {
		expandCollapseListener = listener;
	}
Sets a listener which gets call on item expand or collapse

@param listener
           the listener which will be called when an item is expanded or
           collapsed
library/src/main/java/com/tjerkw/slideexpandable/library/AbstractSlideExpandableListAdapter.java