SystemUI/res/xml/media_session_collapsed.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2022 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/media_action_barrier_start"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@id/media_seamless"
        app:layout_constraintStart_toEndOf="@id/action_button_guideline" />

    <Constraint
        android:id="@+id/album_art"
        android:layout_width="match_parent"
        android:layout_height="@dimen/qs_media_session_height_collapsed"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent" />

    <!-- Touch ripple must have the same constraint as the album art. -->
    <Constraint
        android:id="@+id/touch_ripple_view"
        android:layout_width="match_parent"
        android:layout_height="@dimen/qs_media_session_height_collapsed"
        app:layout_constraintStart_toStartOf="@+id/album_art"
        app:layout_constraintEnd_toEndOf="@+id/album_art"
        app:layout_constraintTop_toTopOf="@+id/album_art"
        app:layout_constraintBottom_toBottomOf="@+id/album_art" />

    <!-- Turbulence noise must have the same constraint as the album art. -->
    <Constraint
        android:id="@+id/turbulence_noise_view"
        android:layout_width="match_parent"
        android:layout_height="@dimen/qs_media_session_height_collapsed"
        app:layout_constraintStart_toStartOf="@+id/album_art"
        app:layout_constraintEnd_toEndOf="@+id/album_art"
        app:layout_constraintTop_toTopOf="@+id/album_art"
        app:layout_constraintBottom_toBottomOf="@+id/album_art" />

    <Constraint
        android:id="@+id/header_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_marginStart="@dimen/qs_media_padding"
        android:layout_marginEnd="@dimen/qs_media_padding"
        app:layout_constraintEnd_toStartOf="@id/action_button_guideline"
        app:layout_constrainedWidth="true"
        app:layout_constraintTop_toBottomOf="@id/icon"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintHorizontal_bias="0" />
    <Constraint
        android:id="@+id/header_artist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/qs_media_padding"
        android:layout_marginTop="0dp"
        app:layout_constraintEnd_toStartOf="@id/action_button_guideline"
        app:layout_constrainedWidth="true"
        app:layout_constraintTop_toBottomOf="@id/header_title"
        app:layout_constraintStart_toStartOf="@id/header_title"
        app:layout_constraintVertical_bias="0"
        app:layout_constraintHorizontal_bias="0" />

    <Constraint
        android:id="@+id/actionPlayPause"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginEnd="@dimen/qs_media_padding"
        android:layout_marginBottom="@dimen/qs_media_padding"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless"
        app:layout_constraintStart_toEndOf="@id/media_action_barrier_end" />

    <!--
    There will only be 3 action buttons shown at most in this layout (controlled in code).
    Play/Pause should always be at the end, but the other buttons should remain in the same order
    when in RTL.
    This is accomplished by setting two barriers at the start and end of the small buttons,
    anchored to a guideline set at 3x button width from the end. The text and play/pause button are
    positioned relative to the barriers, and the small buttons use right/left constraints to stay
    in the correct order inside the barriers.
    -->
    <Constraint
        android:id="@+id/actionPrev"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginBottom="@dimen/qs_media_padding"
        app:layout_constraintHorizontal_bias="1"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintRight_toLeftOf="@id/media_progress_bar"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless"
        app:layout_constraintLeft_toRightOf="@id/media_action_barrier_start" />

    <!-- Showing time while scrubbing isn't available in collapsed mode. -->
    <Constraint
        android:id="@+id/media_scrubbing_elapsed_time"
        android:visibility="gone"
        app:layout_constraintRight_toLeftOf="@id/media_progress_bar"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless"
        app:layout_constraintLeft_toRightOf="@id/media_action_barrier_start" />

    <Constraint
        android:id="@+id/media_progress_bar"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/qs_media_padding"
        android:visibility="gone"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintLeft_toRightOf="@id/actionPrev"
        app:layout_constraintRight_toLeftOf="@id/actionNext"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless" />

    <Constraint
        android:id="@+id/actionNext"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginBottom="@dimen/qs_media_padding"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintLeft_toRightOf="@id/media_progress_bar"
        app:layout_constraintRight_toLeftOf="@id/action0"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless" />

    <!-- Showing time while scrubbing isn't available in collapsed mode. -->
    <Constraint
        android:id="@+id/media_scrubbing_total_time"
        android:visibility="gone"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintLeft_toRightOf="@id/media_progress_bar"
        app:layout_constraintRight_toLeftOf="@id/action0"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless" />

    <Constraint
        android:id="@+id/action0"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginBottom="@dimen/qs_media_padding"
        android:visibility="gone"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintLeft_toRightOf="@id/actionNext"
        app:layout_constraintRight_toLeftOf="@id/action1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless" />

    <Constraint
        android:id="@+id/action1"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginBottom="@dimen/qs_media_padding"
        android:visibility="gone"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintLeft_toRightOf="@id/action0"
        app:layout_constraintRight_toLeftOf="@id/action2"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless" />

    <Constraint
        android:id="@+id/action2"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginBottom="@dimen/qs_media_padding"
        android:visibility="gone"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintLeft_toRightOf="@id/action1"
        app:layout_constraintRight_toLeftOf="@id/action3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless" />

    <Constraint
        android:id="@+id/action3"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginBottom="@dimen/qs_media_padding"
        android:visibility="gone"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintLeft_toRightOf="@id/action2"
        app:layout_constraintRight_toLeftOf="@id/action4"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless" />

    <Constraint
        android:id="@+id/action4"
        android:layout_width="48dp"
        android:layout_height="48dp"
        android:layout_marginBottom="@dimen/qs_media_padding"
        android:visibility="gone"
        app:layout_constraintVertical_bias="1"
        app:layout_constraintLeft_toRightOf="@id/action3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/media_seamless"
        app:layout_constraintRight_toLeftOf="@id/media_action_barrier_end" />
</ConstraintSet>