packages/SystemUI/res/layout/bubble_overflow_activity.xml

<!--
  ~ 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
  -->

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/bubble_overflow_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="@dimen/bubble_overflow_padding"
    android:paddingLeft="@dimen/bubble_overflow_padding"
    android:paddingRight="@dimen/bubble_overflow_padding"
    android:orientation="vertical"
    android:layout_gravity="center_horizontal">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/bubble_overflow_recycler"
        android:layout_gravity="center_horizontal"
        android:nestedScrollingEnabled="false"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <LinearLayout
        android:id="@+id/bubble_overflow_empty_state"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="@dimen/bubble_overflow_empty_state_padding"
        android:paddingRight="@dimen/bubble_overflow_empty_state_padding"
        android:orientation="vertical"
        android:gravity="center">

        <ImageView
            android:layout_width="@dimen/bubble_empty_overflow_image_height"
            android:layout_height="@dimen/bubble_empty_overflow_image_height"
            android:id="@+id/bubble_overflow_empty_state_image"
            android:scaleType="fitCenter"
            android:layout_gravity="center"/>

        <TextView
            android:id="@+id/bubble_overflow_empty_title"
            android:text="@string/bubble_overflow_empty_title"
            android:fontFamily="@*android:string/config_bodyFontFamilyMedium"
            android:textAppearance="@*android:style/TextAppearance.DeviceDefault.Body2"
            android:textColor="?android:attr/textColorSecondary"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"/>

        <TextView
            android:id="@+id/bubble_overflow_empty_subtitle"
            android:fontFamily="@*android:string/config_bodyFontFamily"
            android:textAppearance="@*android:style/TextAppearance.DeviceDefault.Body2"
            android:textColor="?android:attr/textColorSecondary"
            android:text="@string/bubble_overflow_empty_subtitle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingBottom="@dimen/bubble_empty_overflow_subtitle_padding"
            android:gravity="center"/>
    </LinearLayout>
</LinearLayout>