How to save and restore the state of an ExpandableListView in Android?

Question

Is it possible to save and restore the state (which items are collapsed and which not) of an ExpandableListView in Android?

If it is possible, how can I do that?

Answer 1

a simpler way could be, if you're using setOnGroupClickListner and setOnChildClickListener just keep the last selected ChildPosition and GroupPositin integer and later on check it and respond properly,

if (childPosition > 0) {
    mExpandableList.expandGroup(groupPositin);
}
mExpandableList.setItemChecked(groupPositin + childPosition , true);

you just need to remember set childPosition to 0 in your setOnGroupListener method.