k-9/res/layout/message_list.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/batch_button_area"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:visibility="gone"
        android:background="#CCCCCC"
        >
        <ImageButton
            android:id="@+id/batch_read_button"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:src="@drawable/ic_button_mark_read"
        />
        <ImageButton
            android:id="@+id/batch_delete_button"
            android:layout_width="0dip"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:src="@drawable/ic_button_delete"
        />
        <ImageButton
            android:id="@+id/batch_flag_button"
            android:layout_width="0dip"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:src="@drawable/ic_button_flag"
        />
        <ImageButton
            android:id="@+id/batch_done_button"
            android:layout_width="0dip"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:src="@drawable/ic_button_close_clear_cancel"
        />
    </LinearLayout>
    <ListView
        android:id="@+id/message_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_above="@id/batch_button_area"
        android:layout_alignWithParentIfMissing="true"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:cacheColorHint="?android:attr/colorBackground"
    />
</RelativeLayout>