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copied!<p>The linked answer I believe is saying you should keep track of the state of your checked groups in an array list. Then, in your <code>getChildView</code> method for your <code>BaseExpandableListAdapter</code> you would do a check to see if the group for the child is present. </p> <p>Here is my implementation, I'm using a hashmap instead of an arraylist:</p> <pre><code>public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { CheckBox check__bookmark = (CheckBox) child_row.findViewById(R.id._checkBox); if (mapp.group_bookmark_s_checked.containsKey((groupPosition)) == true) check__bookmark.setChecked(true); else check__bookmark.setChecked(false); } public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { CheckBox PlayGroupSelected = (CheckBox) group_row.findViewById(R.id.bookmark_group_checkBox); if (mapp.group_bookmark_s_checked.containsKey((groupPosition)) == true) PlayGroupSelected.setChecked(true); else PlayGroupSelected.setChecked(false); PlayGroupSelected.setOnCheckedChangeListener( new BookmarkGroupCheckedChangeListener(groupPosition, mapp, group_row)); } </code></pre> <p>Now in your listener you manage the state by removing and adding to your state object. I used <code>notifyDataSetChanged()</code> because the children weren't refreshing once drawn on the check state change. Not sure if that was the right way to solve that problem but it did the trick.</p> <pre><code>class BookmarkGroupCheckedChangeListener implements OnCheckedChangeListener { private int mPosition; MyApplication mapp; RelativeLayout mgroup_row; BookmarkGroupCheckedChangeListener(int position, MyApplication app, RelativeLayout group_row) { mapp = app; mPosition = position; mgroup_row = group_row; } public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (isChecked == true) { mapp.group_bookmark_s_checked.put((mPosition), new Boolean(true)); Log.v("DEBUG:", "Group Bookmark Checked On at " + mPosition); notifyDataSetChanged(); } else if (mapp.group_bookmark_s_checked.containsKey(mPosition)) { mapp.group_bookmark_s_checked.remove((mPosition)); Log.v("DEBUG:", "Checked Off at " + mPosition); notifyDataSetChanged(); } } } </code></pre>

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