[android-developers] layout_gravity

OK, I'm obviously missing something fundamentally simple here.
I have a LinearLayout containing 2 buttons.
I've coloured the layout background red so I can see that it has
expanded to fill its parent.
I wanted the BooButton to center horizontally within the layout and
the OtherButton to be right justified.
But both buttons are on the left of the layout.

What have I done wrong?

<LinearLayout android:id="@+id/buttonBlock"
android:orientation="horizontal"
android:background="#ff0000"
android:layout_width="fill_parent"
android:layout_height="wrap_content">

<Button android:id="@+id/booButton"
android:text="Boo"
android:layout_gravity="center_horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

<Button android:id="@+id/otherButton"
android:text="Other"
android:layout_gravity="right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>

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