如何在android的ImageView右下角添加图标？

<RelativeLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/image" />

    <RelativeLayout
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:background="@drawable/icon_background">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/icon" />

    </RelativeLayout>

</RelativeLayout>