packages/SystemUI/res/layout/people_strip.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2019 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.
  -->

<com.android.systemui.statusbar.notification.stack.PeopleHubView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="105dp">

    <com.android.systemui.statusbar.notification.row.NotificationBackgroundView
        android:id="@+id/backgroundNormal"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.android.systemui.statusbar.notification.row.NotificationBackgroundView
        android:id="@+id/backgroundDimmed"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:id="@+id/people_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:paddingTop="8dp"
        android:paddingBottom="8dp"
        android:gravity="center"
        android:orientation="horizontal">

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <LinearLayout
            android:layout_width="70dp"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical"
            android:visibility="invisible">

            <ImageView
                android:id="@+id/person_icon"
                android:layout_width="36dp"
                android:layout_height="36dp"
                android:scaleType="fitCenter"
            />

            <TextView
                android:id="@+id/person_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingTop="8dp"
                android:ellipsize="end"
                android:maxLines="2"
                android:textAlignment="center"
            />

        </LinearLayout>

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <LinearLayout
            android:layout_width="70dp"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical"
            android:visibility="invisible">

            <ImageView
                android:id="@+id/person_icon"
                android:layout_width="36dp"
                android:layout_height="36dp"
                android:scaleType="fitCenter"
            />

            <TextView
                android:id="@+id/person_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingTop="8dp"
                android:ellipsize="end"
                android:maxLines="2"
                android:textAlignment="center"
            />

        </LinearLayout>

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <LinearLayout
            android:layout_width="70dp"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical"
            android:visibility="invisible">

            <ImageView
                android:id="@+id/person_icon"
                android:layout_width="36dp"
                android:layout_height="36dp"
                android:scaleType="fitCenter"
            />

            <TextView
                android:id="@+id/person_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingTop="8dp"
                android:ellipsize="end"
                android:maxLines="2"
                android:textAlignment="center"
            />

        </LinearLayout>

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <LinearLayout
            android:layout_width="70dp"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical"
            android:visibility="invisible">

            <ImageView
                android:id="@+id/person_icon"
                android:layout_width="36dp"
                android:layout_height="36dp"
                android:scaleType="fitCenter"
            />

            <TextView
                android:id="@+id/person_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingTop="8dp"
                android:ellipsize="end"
                android:maxLines="2"
                android:textAlignment="center"
            />

        </LinearLayout>

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

        <LinearLayout
            android:layout_width="70dp"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical"
            android:visibility="invisible">

            <ImageView
                android:id="@+id/person_icon"
                android:layout_width="36dp"
                android:layout_height="36dp"
                android:scaleType="fitCenter"
            />

            <TextView
                android:id="@+id/person_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:paddingTop="8dp"
                android:ellipsize="end"
                android:maxLines="2"
                android:textAlignment="center"
            />

        </LinearLayout>

        <View
            android:layout_width="8dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
        />

    </LinearLayout>

    <com.android.systemui.statusbar.notification.FakeShadowView
        android:id="@+id/fake_shadow"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</com.android.systemui.statusbar.notification.stack.PeopleHubView>