erpsuiteandroid/Apex/res/layout/activity_customize_fields.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    tools:context=".CustomizeFieldsActivity" >

    <com.usai.apex.DragListView   
       android:id="@+id/drag_list"   
       android:layout_width="fill_parent"   
       android:layout_height="fill_parent"  
       android:layout_above="@+id/foot"
       android:cacheColorHint="#00000000"/>  
<LinearLayout
        android:id="@+id/foot"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/btncancel"
                style="?android:attr/buttonStyleSmall"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@android:string/cancel" />

            <Button
                android:id="@+id/btnok"
                style="?android:attr/buttonStyleSmall"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@android:string/ok" />
        </LinearLayout>
    </LinearLayout>

</RelativeLayout>