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.
-->

<!-- Extends RelativeLayout -->
<com.android.systemui.statusbar.phone.StatusBarHeaderView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui"
    android:id="@+id/header"
    style="@style/StatusBarHeader"
    android:layout_height="@dimen/status_bar_header_height"
    android:paddingStart="@dimen/notification_side_padding"
    android:paddingEnd="@dimen/notification_side_padding"
    android:baselineAligned="false"
    android:elevation="4dp"
    >

    <View
        android:id="@+id/background"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/notification_header_bg"
        android:clickable="true"
        />
    <RelativeLayout
        android:id="@+id/datetime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="start"
        android:paddingTop="16dp"
        android:paddingBottom="16dp"
        android:paddingStart="16dp"
        android:paddingEnd="16dp"
        android:background="@drawable/ic_notify_button_bg"
        android:enabled="false"
        >
        <com.android.systemui.statusbar.policy.Clock
            android:id="@+id/clock"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Clock"
            systemui:amPmStyle="normal"
            />

        <com.android.systemui.statusbar.policy.DateView android:id="@+id/date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:textAppearance="@style/TextAppearance.StatusBar.Expanded.Date"
            android:layout_below="@id/clock"
            />
    </RelativeLayout>

    <com.android.systemui.statusbar.phone.MultiUserSwitch android:id="@+id/multi_user_switch"
        android:layout_width="40dp"
        android:layout_height="@dimen/status_bar_header_height"
        android:layout_alignParentEnd="true"
        android:background="@null"
        android:scaleType="centerInside"
        android:padding="8dp"
        />

    <ImageButton android:id="@+id/settings_button"
        style="@android:style/Widget.Material.Button.Borderless"
        android:layout_toStartOf="@id/multi_user_switch"
        android:layout_width="56dp"
        android:layout_height="@dimen/status_bar_header_height"
        android:src="@drawable/ic_settings_24dp"
        android:contentDescription="@string/accessibility_desc_quick_settings"/>

    <FrameLayout android:id="@+id/system_icons_container"
        android:layout_width="wrap_content"
        android:layout_height="@dimen/status_bar_header_height"
        android:layout_toStartOf="@id/multi_user_switch"
        android:layout_marginEnd="4dp"
        />

    <com.android.keyguard.CarrierText
        android:id="@+id/keyguard_carrier_text"
        android:layout_width="match_parent"
        android:layout_height="@dimen/status_bar_header_height_keyguard"
        android:layout_marginLeft="8dp"
        android:layout_toStartOf="@id/system_icons_container"
        android:gravity="center_vertical"
        android:ellipsize="marquee"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:textColor="#ffffff"
        android:singleLine="true" />

    <include
        layout="@layout/quick_settings_brightness_dialog"
        android:id="@+id/brightness_container"
        android:layout_width="match_parent"
        />

    <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"
        />

</com.android.systemui.statusbar.phone.StatusBarHeaderView>