Place 3 buttons in a LinearLayout to occupy equal amount of space

The following layout should work. weights are for LinearLayouts..

<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="3"
>

    <Button android:id="@+id/button1"
            ...
            android:layout_weight="1"/>

    <Button android:id="@+id/button2"
            ...
            android:layout_weight="1"/>

    <Button
        android:id="@+id/button3"
        ...
        android:layout_weight="1"/>

</LinearLayout>