<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white">

    <ExpandableListView
        android:id="@+id/deptTreeView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>