erpsuiteandroid/ApexDrivers/app/src/main/res/layout/activity_detail.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Detail.DetailActivity">

    <ExpandableListView
        android:id="@+id/detail_list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />

</android.support.constraint.ConstraintLayout>