packages/SystemUI/res/xml/media_recommendation_collapsed.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/media_cover1_container"
        android:layout_width="0dp"
        android:layout_height="@dimen/qs_aa_media_rec_album_size_collapsed"
        app:layout_constraintWidth_max="@dimen/qs_aa_media_rec_album_size_collapsed"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginTop="@dimen/qs_media_padding"
        android:layout_marginBottom="@dimen/qs_media_padding"
        android:layout_marginEnd="@dimen/qs_aa_media_rec_album_margin"
        app:layout_constraintStart_toEndOf="@id/media_vertical_start_guideline"
        app:layout_constraintEnd_toStartOf="@id/media_cover2_container"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintHorizontal_bias="1"
        android:visibility="gone" />

    <Constraint
        android:id="@+id/media_cover2_container"
        android:layout_width="0dp"
        android:layout_height="@dimen/qs_aa_media_rec_album_size_collapsed"
        app:layout_constraintWidth_max="@dimen/qs_aa_media_rec_album_size_collapsed"
        android:layout_marginTop="@dimen/qs_media_padding"
        android:layout_marginBottom="@dimen/qs_media_padding"
        android:layout_marginEnd="@dimen/qs_aa_media_rec_album_margin"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@id/media_cover1_container"
        app:layout_constraintEnd_toStartOf="@id/media_cover3_container"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintHorizontal_bias="1"
        android:visibility="gone" />

    <Constraint
        android:id="@+id/media_cover3_container"
        android:layout_width="0dp"
        android:layout_height="@dimen/qs_aa_media_rec_album_size_collapsed"
        app:layout_constraintWidth_max="@dimen/qs_aa_media_rec_album_size_collapsed"
        android:layout_marginTop="@dimen/qs_media_padding"
        android:layout_marginBottom="@dimen/qs_media_padding"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@id/media_cover2_container"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintHorizontal_bias="1"
        android:visibility="gone" />

    <Constraint
        android:id="@+id/media_cover4_container"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginEnd="@dimen/qs_aa_media_rec_album_margin"
        app:layout_constraintTop_toBottomOf="@+id/media_cover1_container"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@id/media_vertical_start_guideline"
        app:layout_constraintEnd_toStartOf="@id/media_cover5_container"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintHorizontal_bias="1"
        android:visibility="gone" />

    <Constraint
        android:id="@+id/media_cover5_container"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginEnd="@dimen/qs_aa_media_rec_album_margin"
        app:layout_constraintTop_toBottomOf="@+id/media_cover2_container"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@+id/media_cover4_container"
        app:layout_constraintEnd_toStartOf="@+id/media_cover6_container"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintHorizontal_bias="1"
        android:visibility="gone" />

    <Constraint
        android:id="@+id/media_cover6_container"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@id/media_cover3_container"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@id/media_cover5_container"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintHorizontal_bias="1"
        android:visibility="gone" />

</ConstraintSet>