samples/wearable/SynchronizedNotifications/Application/src/main/res/layout/activity_phone.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=".PhoneActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/phone_only"
        android:id="@+id/phone_only"
        android:onClick="onClick"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/wear_only"
        android:id="@+id/wear_only"
        android:onClick="onClick"
        android:layout_below="@+id/phone_only"
        android:layout_alignLeft="@+id/phone_only"
        android:layout_marginTop="30dp"
        android:layout_alignRight="@+id/phone_only" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/different_notifications"
        android:id="@+id/different_notifications"
        android:layout_below="@+id/wear_only"
        android:onClick="onClick"
        android:layout_alignLeft="@+id/wear_only"
        android:layout_marginTop="30dp"
        android:layout_alignRight="@+id/wear_only" />
</RelativeLayout>