packages/SystemUI/res/layout/keyguard_media_header.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
  -->

<!-- Layout for media controls on the lockscreen -->
<com.android.systemui.statusbar.notification.stack.MediaHeaderView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingStart="0dp"
    android:paddingEnd="0dp"
    android:focusable="true"
    android:clickable="true"
>

    <!-- Background views required by ActivatableNotificationView. -->
    <com.android.systemui.statusbar.notification.row.NotificationBackgroundView
        android:id="@+id/backgroundNormal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    />

    <com.android.systemui.statusbar.notification.row.NotificationBackgroundView
        android:id="@+id/backgroundDimmed"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    />

    <com.android.systemui.statusbar.notification.FakeShadowView
        android:id="@+id/fake_shadow"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    />

    <!-- Layout for media controls. -->
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/keyguard_media_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center"
        android:padding="16dp"
    >
        <ImageView
            android:id="@+id/album_art"
            android:layout_width="@dimen/qs_media_album_size"
            android:layout_height="@dimen/qs_media_album_size"
            android:layout_marginRight="16dp"
            android:layout_weight="0"
        />

        <!-- Media information -->
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
        >
            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
            >
                <com.android.internal.widget.CachingIconView
                    android:id="@+id/icon"
                    android:layout_width="16dp"
                    android:layout_height="16dp"
                    android:layout_marginEnd="5dp"
                />
                <TextView
                    android:id="@+id/app_name"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="14sp"
                    android:singleLine="true"
                />
            </LinearLayout>

            <!-- Song name -->
            <TextView
                android:id="@+id/header_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:fontFamily="@*android:string/config_headlineFontFamilyMedium"
                android:textSize="18sp"
                android:paddingBottom="6dp"
                android:gravity="center"/>

            <!-- Artist name -->
            <TextView
                android:id="@+id/header_artist"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:fontFamily="@*android:string/config_bodyFontFamily"
                android:textSize="14sp"
                android:singleLine="true"
            />
        </LinearLayout>

        <!-- Controls -->
        <LinearLayout
            android:id="@+id/media_actions"
            android:orientation="horizontal"
            android:layoutDirection="ltr"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:layout_gravity="center"
        >
            <ImageButton
                style="@android:style/Widget.Material.Button.Borderless.Small"
                android:layout_width="48dp"
                android:layout_height="48dp"
                android:gravity="center"
                android:visibility="gone"
                android:id="@+id/action0"
            />
            <ImageButton
                style="@android:style/Widget.Material.Button.Borderless.Small"
                android:layout_width="48dp"
                android:layout_height="48dp"
                android:gravity="center"
                android:visibility="gone"
                android:id="@+id/action1"
            />
            <ImageButton
                style="@android:style/Widget.Material.Button.Borderless.Small"
                android:layout_width="48dp"
                android:layout_height="48dp"
                android:gravity="center"
                android:visibility="gone"
                android:id="@+id/action2"
            />
        </LinearLayout>
    </LinearLayout>

</com.android.systemui.statusbar.notification.stack.MediaHeaderView>