apps/CtsVerifier/res/layout/activity_start.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                android:paddingBottom="@dimen/activity_vertical_margin"
                tools:context=".StartActivity">

    <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:id="@+id/tvDesc"
            android:text="@string/overall_instructions"/>

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tvDesc"
            android:layout_centerHorizontal="true"
            android:id="@+id/btnStart"
            android:text="@string/start"/>

</RelativeLayout>