Expandable List view

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ExpandableListView android:id="@+id/ExpandableListView01"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:background="#ffffff"/>
</LinearLayout>