packages/SystemUI/res/layout/media_output_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2020 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/media_output_dialog"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="94dp"
        android:gravity="start|center_vertical"
        android:paddingStart="16dp"
        android:orientation="horizontal">
        <ImageView
            android:id="@+id/header_icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingEnd="16dp"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="16dp"
            android:orientation="vertical">
            <TextView
                android:id="@+id/header_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:maxLines="1"
                android:textColor="?android:attr/textColorPrimary"
                android:fontFamily="@*android:string/config_headlineFontFamilyMedium"
                android:textSize="20sp"/>

            <TextView
                android:id="@+id/header_subtitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:maxLines="1"
                android:fontFamily="roboto-regular"
                android:textSize="14sp"/>

        </LinearLayout>
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="?android:attr/listDivider"/>

    <LinearLayout
        android:id="@+id/device_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="start|center_vertical"
        android:orientation="vertical">

        <View
            android:layout_width="match_parent"
            android:layout_height="12dp"/>

        <include
            layout="@layout/media_output_list_item"
            android:id="@+id/group_item_controller"
            android:visibility="gone"/>

        <View
            android:id="@+id/group_item_divider"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="?android:attr/listDivider"
            android:visibility="gone"/>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/list_result"
            android:scrollbars="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:overScrollMode="never"/>

        <View
            android:id="@+id/list_bottom_padding"
            android:layout_width="match_parent"
            android:layout_height="12dp"/>
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="?android:attr/listDivider"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/stop"
            style="@*android:style/Widget.DeviceDefault.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="64dp"
            android:text="@string/keyboard_key_media_stop"
            android:visibility="gone"/>

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

        <Button
            android:id="@+id/done"
            style="@*android:style/Widget.DeviceDefault.Button.Borderless.Colored"
            android:layout_width="wrap_content"
            android:layout_height="64dp"
            android:layout_marginEnd="0dp"
            android:text="@string/inline_done_button"/>
    </LinearLayout>
</LinearLayout>