session-android/res/layout/activity_linked_devices.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/default_session_background">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:id="@+id/emptyStateContainer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:orientation="vertical"
        android:layout_centerInParent="true">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="@dimen/medium_font_size"
            android:textColor="@color/text"
            android:text="You haven't linked any devices yet" />

        <Button
            style="@style/MediumProminentOutlineButton"
            android:id="@+id/linkDeviceButton"
            android:layout_width="196dp"
            android:layout_height="@dimen/medium_button_height"
            android:layout_marginTop="@dimen/medium_spacing"
            android:text="Link a Device (Beta)" />

    </LinearLayout>

</RelativeLayout>