Highlight for selected item in expandable list

Question

I have a layout where I have an expandable list in a fragment on the left and a details fragment on the right. This all works fine.

Now I would like to indicate what

Answer 1

Do the following on ExpandableListView:

Step 1. Set choice mode to single (Can be done in xml as android:choiceMode = "singleChoice")

Step 2. Use a selector xml as background (android:listSelector = "@drawable/selector_list_item")

Step 3. Call expandableListView.setItemChecked(index,true) in onChildClick() callback.

index is a 0 based index of the child item calculated as follows

Group 1 [index = 0]

• Child item 1
• Child item 2
• Child item 3 [index = 3]

Group 2 [index = 4]

• Child item 1
• Child item 2
• Child item 3 [index = 7]

Group 3 [index = 8]

• Child item 1
• Child item 2
• Child item 3 [index = 11]

If we have list headers as well, they would also account for index values.

Here is a working example:

@Override
public boolean onChildClick(ExpandableListView parent, View v,
        int groupPosition, int childPosition, long id) {
    ...

    int index = parent.getFlatListPosition(ExpandableListView.getPackedPositionForChild(groupPosition, childPosition));
    parent.setItemChecked(index, true);


    return true;
}