comment regler haut et le bas page xml
<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/premier"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Premier bouton" />
<Button
android:id="@+id/second"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Second bouton" />
</LinearLayout>