session-android/res/layout/device_list_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              xmlns:tools="http://schemas.android.com/tools"
              xmlns:fab="http://schemas.android.com/apk/res-auto"
              android:orientation="vertical">

    <LinearLayout android:id="@+id/progress_container"
                  android:layout_width="fill_parent"
                  android:layout_height="fill_parent"
                  android:gravity="center"
                  android:orientation="vertical"
                  android:visibility="gone" >

        <ProgressBar android:id="@+id/progress"
                     android:indeterminate="true"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content" >
        </ProgressBar>
    </LinearLayout>

    <TextView android:id="@+id/empty"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_gravity="center|center_vertical"
              android:gravity="center|center_vertical"
              android:textSize="20sp"
              android:visibility="gone"
              android:text="@string/device_list_fragment__no_devices_linked"
              android:paddingStart="16dip"
              android:paddingEnd="16dip"
              android:layout_weight="1"
              tools:visibility="visible"/>

    <ListView android:id="@id/android:list"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:layout_weight="1"
              android:drawSelectorOnTop="false"
              android:paddingStart="16dip"
              android:paddingEnd="16dip"
              tools:visibility="gone"/>

    <com.melnykov.fab.FloatingActionButton
            android:id="@+id/add_device"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|right"
            android:layout_margin="16dp"
            android:src="@drawable/ic_add_white_original_24dp"
            android:focusable="true"
            android:contentDescription="@string/device_list_fragment__link_new_device"
            fab:fab_colorNormal="?fab_color"
            fab:fab_colorPressed="@color/textsecure_primary_dark"
            fab:fab_colorRipple="@color/textsecure_primary_dark" />

</LinearLayout>