Conception du widgetLayout.xml

Bonjour
Voici un exemple sur la conception du widgetLayout.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:gravity="center"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/background">
<Button
android:layout_width="283dip"
android:layout_height="54dip"
android:id="@android:id/texte"
android:textColor="#ff000000"
android:text="@string/hello"
android:background="@drawable/button1"
android:gravity="center"
/>
</LinearLayout>