packages/Keyguard/res/layout/keyguard_message_area.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.
*/
-->

<!-- This contains emergency call button and carrier as shared by pin/pattern/password screens -->
<com.android.keyguard.KeyguardMessageArea
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:id="@+id/keyguard_message_area"
    android:singleLine="true"
    android:ellipsize="marquee"
    android:textAppearance="?android:attr/textAppearance"
    android:textSize="@dimen/kg_status_line_font_size"
    android:textColor="?android:attr/textColorSecondary"
    android:clickable="true" />