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

Improving Floaf's answer: declare

 public static int firstVisiblePosition=0;

on Pause

int numberOfGroups = MyExpandableListViewAdapter.getGroupCount();
boolean[] groupExpandedArray = new boolean[numberOfGroups];
for (int i=0;i

onResume

for (int i=0;i

This will not only restore each group's state but it will also scroll to the childView that was viewed when activity paused.