Signal-Android/res/layout/contact_selection_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_gravity="center"
              android:layout_height="fill_parent"
              android:layout_width="fill_parent"
              android:orientation="vertical"
              xmlns:android="http://schemas.android.com/apk/res/android">

    <android.support.v4.view.ViewPager android:id="@+id/pager"
                                       android:layout_width="match_parent"
                                       android:layout_height="match_parent" />

</LinearLayout>