packages/SystemUI/res/layout/media_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ 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
  -->

<!-- Layout for media controls inside QSPanel carousel -->
<com.android.systemui.util.animation.TransitionLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/qs_media_controls"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clipChildren="false"
    android:clipToPadding="false"
    android:gravity="center_horizontal|fill_vertical"
    android:background="@drawable/qs_media_background">

    <!-- As per Material Design on Biderectionality, this is forced to LTR in code -->
    <FrameLayout
        android:id="@+id/notification_media_progress_time"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:forceHasOverlappingRendering="false">
        <!-- width is set to "match_parent" to avoid extra layout calls -->
        <TextView
            android:id="@+id/media_elapsed_time"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:fontFamily="@*android:string/config_bodyFontFamily"
            android:textColor="@color/media_primary_text"
            android:gravity="start"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/media_total_time"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:fontFamily="@*android:string/config_bodyFontFamily"
            android:textColor="@color/media_primary_text"
            android:gravity="end"
            android:textSize="14sp" />
    </FrameLayout>

    <!--  Actions must be ordered left-to-right even in RTL layout.  However, they appear in a chain
    with the album art and the title, and must as a group appear at the end of that chain.  This is
    accomplished by having the guidebox (an invisible view that is positioned around all 5 actions)
    in the chain with the album art and the title.  The actions are in a LTR chain bounded by that
    guidebox, and the ambiguity of how wide the guidebox should be is resolved by using a barrier
    which forces it's starting edge to be as far to the end as possible while fitting the actions.
    -->
    <androidx.constraintlayout.widget.Barrier
        android:id="@+id/media_action_barrier"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="vertical"
        app:barrierDirection="start"
        />

    <View
        android:id="@+id/media_action_guidebox"
        android:layout_width="0dp"
        android:layout_height="48dp"
        android:layout_marginTop="16dp"
        android:visibility="invisible"
        />

    <ImageButton
        android:id="@+id/action0"
        style="@style/MediaPlayer.Button"
        android:layout_width="48dp"
        android:layout_height="48dp" />

    <ImageButton
        android:id="@+id/action1"
        style="@style/MediaPlayer.Button"
        android:layout_width="48dp"
        android:layout_height="48dp" />

    <ImageButton
        android:id="@+id/action2"
        style="@style/MediaPlayer.Button"
        android:layout_width="52dp"
        android:layout_height="52dp" />

    <ImageButton
        android:id="@+id/action3"
        style="@style/MediaPlayer.Button"
        android:layout_width="48dp"
        android:layout_height="48dp" />

    <ImageButton
        android:id="@+id/action4"
        style="@style/MediaPlayer.Button"
        android:layout_width="48dp"
        android:layout_height="48dp" />

    <!-- Album Art -->
    <ImageView
        android:id="@+id/album_art"
        android:layout_width="@dimen/qs_media_album_size"
        android:layout_height="@dimen/qs_media_album_size" />

    <!-- Seamless Output Switcher -->
    <LinearLayout
        android:id="@+id/media_seamless"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:foreground="@drawable/qs_media_seamless_background"
        android:background="@drawable/qs_media_light_source"
        android:orientation="horizontal"
        android:forceHasOverlappingRendering="false"
        android:paddingStart="12dp"
        android:paddingTop="6dp"
        android:paddingEnd="12dp"
        android:paddingBottom="6dp">

        <ImageView
            android:id="@+id/media_seamless_image"
            android:layout_width="@dimen/qs_seamless_icon_size"
            android:layout_height="@dimen/qs_seamless_icon_size"
            android:layout_marginEnd="8dp"
            android:tint="@color/media_primary_text"
            android:src="@*android:drawable/ic_media_seamless" />

        <TextView
            android:id="@+id/media_seamless_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:fontFamily="@*android:string/config_headlineFontFamily"
            android:singleLine="true"
            android:text="@*android:string/ext_media_seamless_action"
            android:textColor="@color/media_primary_text"
            android:textDirection="locale"
            android:textSize="14sp" />
    </LinearLayout>

    <ImageView
        android:id="@+id/media_seamless_fallback"
        android:layout_width="@dimen/qs_seamless_icon_size"
        android:layout_height="@dimen/qs_seamless_icon_size"
        android:tint="@color/media_primary_text"
        android:src="@drawable/ic_cast_connected"
        android:forceHasOverlappingRendering="false" />

    <androidx.constraintlayout.widget.Barrier
        android:id="@+id/media_seamless_barrier"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:barrierDirection="start"
        app:constraint_referenced_ids="media_seamless,media_seamless_fallback"
        app:barrierAllowsGoneWidgets="false"
        />

    <!-- Seek Bar -->
    <!-- As per Material Design on Biderectionality, this is forced to LTR in code -->
    <SeekBar
        android:id="@+id/media_progress_bar"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:maxHeight="@dimen/qs_media_enabled_seekbar_height"
        android:paddingTop="16dp"
        android:paddingBottom="16dp"
        android:thumbTint="@color/media_primary_text"
        android:progressTint="@color/media_seekbar_progress"
        android:progressBackgroundTint="@color/media_disabled"
        android:splitTrack="false" />

    <!-- App name -->
    <TextView
        android:id="@+id/app_name"
        android:textColor="@color/media_primary_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:singleLine="true"
        android:fontFamily="@*android:string/config_headlineFontFamily"
        android:textDirection="locale"
        android:textSize="14sp" />

    <!-- Song name -->
    <TextView
        android:id="@+id/header_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="@*android:string/config_headlineFontFamilyMedium"
        android:singleLine="true"
        android:textColor="@color/media_primary_text"
        android:textDirection="locale"
        android:textSize="16sp" />

    <!-- Artist name -->
    <TextView
        android:id="@+id/header_artist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="@*android:string/config_headlineFontFamily"
        android:singleLine="true"
        android:textColor="@color/media_secondary_text"
        android:textDirection="locale"
        android:textSize="14sp" />

    <com.android.internal.widget.CachingIconView
        android:id="@+id/icon"
        android:tint="@color/media_primary_text"
        android:layout_width="20dp"
        android:layout_height="20dp" />

    <!-- Buttons to remove this view when no longer needed -->
    <include
        layout="@layout/qs_media_panel_options"
        android:visibility="gone" />
</com.android.systemui.util.animation.TransitionLayout>