expandable list view in android

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2<RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"
3    xmlns:tools="https://schemas.android.com/tools"
4    android:layout_width="match_parent"
5    android:layout_height="match_parent"
6    android:paddingLeft="@dimen/activity_horizontal_margin"
7    android:paddingRight="@dimen/activity_horizontal_margin"
8    android:paddingTop="@dimen/activity_vertical_margin"
9    android:paddingBottom="@dimen/activity_vertical_margin"
10    tools:context=".MainActivity">
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12    <ExpandableListView
13        android:id="@+id/expandableListView"
14        android:layout_height="match_parent"
15        android:layout_width="match_parent"
16        android:indicatorLeft="?android:attr/expandableListPreferredItemIndicatorLeft"
17        android:divider="@android:color/darker_gray"
18        android:dividerHeight="0.5dp" />
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20</RelativeLayout>
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