nextcloud-android/res/layout/list_fragment_expandable.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- 
This must be a clone of list_fragment.xml 

EXCEPT: ExpandableListView must be used for @+id/swipe_refresh_files_emptyView
 -->
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="@dimen/zero"
	android:layout_height="match_parent"
	android:layout_weight="1" >

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh_files"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ExpandableListView 
            android:id="@+id/list_root"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
        
    </android.support.v4.widget.SwipeRefreshLayout>

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_refresh_files_emptyView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone" >

        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent" >

	            <TextView
			        android:id="@+id/empty_list_view"
			        android:layout_width="match_parent"
			        android:layout_height="wrap_content"
			        android:gravity="center_vertical|center_horizontal"
			        android:text="@string/empty"
					android:layout_gravity="center"
			        android:visibility="visible" />

        </ScrollView>
    </android.support.v4.widget.SwipeRefreshLayout>
</FrameLayout>