frameworks/base/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="@dimen/large_dialog_width"
    android:layout_height="wrap_content"
    android:background="@drawable/media_output_dialog_background"
    android:orientation="vertical">

    <LinearLayout
        android:id="@+id/media_metadata_section"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="start|center_vertical"
        android:paddingStart="16dp"
        android:paddingTop="16dp"
        android:paddingEnd="16dp"
        android:paddingBottom="24dp"
        android:orientation="horizontal">
        <ImageView
            android:id="@+id/header_icon"
            android:layout_width="72dp"
            android:layout_height="72dp"
            android:importantForAccessibility="no"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingStart="12dp"
            android:orientation="vertical">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:orientation="horizontal">
                <ImageView
                    android:id="@+id/app_source_icon"
                    android:layout_width="20dp"
                    android:layout_height="20dp"
                    android:gravity="center_vertical"
                    android:importantForAccessibility="no"/>

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

                <ImageView
                    android:id="@+id/broadcast_icon"
                    android:src="@drawable/settings_input_antenna"
                    android:contentDescription="@string/broadcasting_description_is_broadcasting"
                    android:layout_width="48dp"
                    android:layout_height="48dp"
                    android:padding="12dp"
                    android:gravity="center_vertical"
                    android:clickable="true"
                    android:focusable="true"
                    android:visibility="gone"/>
            </LinearLayout>
            <TextView
                android:id="@+id/header_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:ellipsize="end"
                android:gravity="center_vertical"
                android:maxLines="1"
                android:textColor="?android:attr/textColorPrimary"
                android:fontFamily="@*android:string/config_headlineFontFamilyMedium"
                android:textSize="16sp"/>
            <TextView
                android:id="@+id/header_subtitle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:ellipsize="end"
                android:maxLines="1"
                android:textColor="?android:attr/textColorSecondary"
                android:fontFamily="@*android:string/config_bodyFontFamily"
                android:textSize="14sp"/>
        </LinearLayout>
    </LinearLayout>

    <ViewStub
        android:id="@+id/broadcast_qrcode"
        android:layout="@layout/media_output_broadcast_area"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ViewStub>

    <LinearLayout
        android:id="@+id/device_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:orientation="vertical">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/list_result"
            android:scrollbars="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/cast_app_section"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_marginStart="@dimen/dialog_side_padding"
        android:layout_marginEnd="@dimen/dialog_side_padding"
        android:layout_marginBottom="@dimen/dialog_bottom_padding"
        android:orientation="vertical"
        android:visibility="gone">
        <TextView
            android:id="@+id/launch_app_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical|start"
            android:ellipsize="end"
            android:textColor="?android:attr/textColorPrimary"
            android:text="@string/media_output_dialog_launch_app_text"
            android:maxLines="1"
            android:fontFamily="@*android:string/config_headlineFontFamilyMedium"
            android:textSize="16sp"/>

        <Button
            android:id="@+id/launch_app_button"
            style="@style/Widget.Dialog.Button.BorderButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawablePadding="5dp"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="4dp"
        android:layout_marginStart="@dimen/dialog_side_padding"
        android:layout_marginEnd="@dimen/dialog_side_padding"
        android:layout_marginBottom="@dimen/dialog_bottom_padding"
        android:orientation="horizontal">

        <Button
            android:id="@+id/stop"
            style="@style/Widget.Dialog.Button.BorderButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/media_output_dialog_button_stop_casting"
            android:visibility="gone"/>

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

        <Button
            android:id="@+id/done"
            style="@style/Widget.Dialog.Button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/inline_done_button"/>
    </LinearLayout>
</LinearLayout>