packages/SystemUI/res/layout/status_bar_expanded_header.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
** Copyright 2012, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License"); 
** you may not use this file except in compliance with the License. 
** You may obtain a copy of the License at 
**
**     http://www.apache.org/licenses/LICENSE-2.0 
**
** Unless required by applicable law or agreed to in writing, software 
** distributed under the License is distributed on an "AS IS" BASIS, 
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
** See the License for the specific language governing permissions and 
** limitations under the License.
-->

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/notification_header_bg"
    android:orientation="horizontal"
    android:gravity="center_vertical"
    android:baselineAligned="false"
    >
    <com.android.systemui.statusbar.policy.Clock
        android:id="@+id/clock"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:singleLine="true"
        android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Clock"
        />

    <com.android.systemui.statusbar.policy.DateView android:id="@+id/date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Date"
        />

    <com.android.systemui.statusbar.RotationToggle android:id="@+id/rotation_lock_button"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:layout_margin="8dp"
        android:button="@drawable/ic_notify_rotation"
        android:contentDescription="@string/accessibility_rotation_lock_off"
        android:clickable="true"
        />

    <ImageView android:id="@+id/settings_button"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:scaleType="center"
        android:src="@drawable/ic_notify_quicksettings"
        android:contentDescription="@string/accessibility_settings_button"
        />

    <Space
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_weight="1"
        />

    <TextView
        android:id="@+id/header_debug_info"
        android:visibility="invisible"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:fontFamily="sans-serif-condensed"
        android:textSize="11dp"
        android:textStyle="bold"
        android:textColor="#00A040"
        android:padding="2dp"
        />
    
    <ImageView android:id="@+id/clear_all_button"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:scaleType="center"
        android:src="@drawable/ic_notify_clear"
        android:contentDescription="@string/accessibility_clear_all"
        />     
</LinearLayout>