packages/SystemUI/res/xml/media_expanded.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
  -->
<ConstraintSet
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <Constraint
        android:id="@+id/icon"
        android:layout_width="16dp"
        android:layout_height="16dp"
        android:layout_marginStart="18dp"
        android:layout_marginTop="22dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        />

    <Constraint
        android:id="@+id/app_name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="10dp"
        android:layout_marginStart="10dp"
        android:layout_marginTop="20dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toEndOf="@id/icon"
        app:layout_constraintEnd_toStartOf="@id/media_seamless"
        app:layout_constraintHorizontal_bias="0"
        />

    <Constraint
        android:id="@+id/media_seamless"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_min="60dp"
        android:layout_marginTop="@dimen/qs_media_panel_outer_padding"
        android:layout_marginEnd="@dimen/qs_media_panel_outer_padding"
        />

    <Constraint
        android:id="@+id/album_art"
        android:layout_width="@dimen/qs_media_album_size"
        android:layout_height="@dimen/qs_media_album_size"
        android:layout_marginTop="14dp"
        android:layout_marginStart="@dimen/qs_media_panel_outer_padding"
        app:layout_constraintTop_toBottomOf="@+id/app_name"
        app:layout_constraintStart_toStartOf="parent"
        />

    <!-- Song name -->
    <Constraint
        android:id="@+id/header_title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/qs_media_panel_outer_padding"
        android:layout_marginTop="17dp"
        android:layout_marginStart="16dp"
        app:layout_constraintTop_toBottomOf="@+id/app_name"
        app:layout_constraintStart_toEndOf="@id/album_art"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0"/>

    <!-- Artist name -->
    <Constraint
        android:id="@+id/header_artist"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/qs_media_panel_outer_padding"
        android:layout_marginTop="3dp"
        app:layout_constraintTop_toBottomOf="@id/header_title"
        app:layout_constraintStart_toStartOf="@id/header_title"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0"/>

    <!-- Seek Bar -->
    <Constraint
        android:id="@+id/media_progress_bar"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="3dp"
        app:layout_constraintTop_toBottomOf="@id/header_artist"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        />

    <Constraint
        android:id="@+id/notification_media_progress_time"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="38dp"
        android:layout_marginEnd="@dimen/qs_media_panel_outer_padding"
        android:layout_marginStart="@dimen/qs_media_panel_outer_padding"
        app:layout_constraintTop_toBottomOf="@id/header_artist"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        />

    <Constraint
        android:id="@+id/action0"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginTop="5dp"
        android:layout_marginStart="4dp"
        android:layout_marginEnd="4dp"
        android:layout_marginBottom="@dimen/qs_media_panel_outer_padding"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@id/action1"
        app:layout_constraintTop_toBottomOf="@id/notification_media_progress_time"
        app:layout_constraintBottom_toBottomOf="parent">
    </Constraint>

    <Constraint
        android:id="@+id/action1"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginStart="4dp"
        android:layout_marginEnd="4dp"
        android:layout_marginBottom="@dimen/qs_media_panel_outer_padding"
        app:layout_constraintLeft_toRightOf="@id/action0"
        app:layout_constraintRight_toLeftOf="@id/action2"
        app:layout_constraintTop_toTopOf="@id/action0"
        app:layout_constraintBottom_toBottomOf="parent">
    </Constraint>

    <Constraint
        android:id="@+id/action2"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginStart="4dp"
        android:layout_marginEnd="4dp"
        android:layout_marginBottom="@dimen/qs_media_panel_outer_padding"
        app:layout_constraintLeft_toRightOf="@id/action1"
        app:layout_constraintRight_toLeftOf="@id/action3"
        app:layout_constraintTop_toTopOf="@id/action0"
        app:layout_constraintBottom_toBottomOf="parent">
    </Constraint>

    <Constraint
        android:id="@+id/action3"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginStart="4dp"
        android:layout_marginEnd="4dp"
        app:layout_constraintLeft_toRightOf="@id/action2"
        app:layout_constraintRight_toLeftOf="@id/action4"
        app:layout_constraintTop_toTopOf="@id/action0"
        android:layout_marginBottom="@dimen/qs_media_panel_outer_padding"
        app:layout_constraintBottom_toBottomOf="parent">
    </Constraint>

    <Constraint
        android:id="@+id/action4"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginStart="4dp"
        android:layout_marginEnd="4dp"
        android:layout_marginBottom="@dimen/qs_media_panel_outer_padding"
        app:layout_constraintLeft_toRightOf="@id/action3"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@id/action0"
        app:layout_constraintBottom_toBottomOf="parent">
    </Constraint>
</ConstraintSet>