packages/SystemUI/res/layout/qs_footer_impl.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
** Copyright 2021, 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 FrameLayout -->
<com.android.systemui.qs.QSFooterView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/qs_footer"
    android:layout_width="match_parent"
    android:layout_height="@dimen/qs_footer_height"
    android:layout_marginStart="@dimen/qs_footer_margin"
    android:layout_marginEnd="@dimen/qs_footer_margin"
    android:layout_marginBottom="@dimen/qs_footers_margin_bottom"
    android:background="@android:color/transparent"
    android:baselineAligned="false"
    android:clickable="false"
    android:clipChildren="false"
    android:clipToPadding="false">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="48dp"
            android:layout_gravity="center_vertical">

            <TextView
                android:id="@+id/build"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:paddingStart="@dimen/qs_tile_margin_horizontal"
                android:paddingEnd="4dp"
                android:layout_weight="1"
                android:clickable="true"
                android:ellipsize="marquee"
                android:focusable="true"
                android:gravity="center_vertical"
                android:singleLine="true"
                android:textAppearance="@style/TextAppearance.QS.Status.Build"
                android:visibility="gone" />

            <com.android.systemui.qs.PageIndicator
                android:id="@+id/footer_page_indicator"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_gravity="center_vertical"
                android:visibility="gone" />

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

        </LinearLayout>

        <include layout="@layout/footer_actions"
            android:id="@+id/qs_footer_actions"/>

    </LinearLayout>

</com.android.systemui.qs.QSFooterView>