conversations-classic/res/layout-sw720dp/fragment_conversations_overview.xml

<android.support.v4.widget.SlidingPaneLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/slidingpanelayout">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="288dp"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/primarybackground"
    >
 
    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:divider="@color/divider"
        android:dividerHeight="1dp"
        android:background="@color/primarybackground"
     />
 
</LinearLayout>
<LinearLayout 
    android:id="@+id/selected_conversation"
    android:layout_width="fill_parent"
	android:layout_height="match_parent"
	android:layout_weight="1"
	android:orientation="vertical">
</LinearLayout>      
</android.support.v4.widget.SlidingPaneLayout>