<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <Button android:id="@+id/hola_boton"
        android:text="Hola"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>

</LinearLayout>