session-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">

    <LinearLayout android:id="@+id/fragment_container"
                  android:layout_height="match_parent"
                  android:layout_width="match_parent"/>

</LinearLayout>