packages/SettingsLib/CollapsingToolbarBaseActivity/res/layout-v31/collapsing_toolbar_base_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2021 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.
  -->
<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/content_parent"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:outlineAmbientShadowColor="@android:color/transparent"
        android:outlineSpotShadowColor="@android:color/transparent"
        android:background="?android:attr/colorPrimary"
        android:theme="@style/Theme.CollapsingToolbar.Settings">

        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="@dimen/settingslib_toolbar_layout_height"
            android:clipToPadding="false"
            app:forceApplySystemWindowInsetTop="true"
            app:extraMultilineHeightEnabled="true"
            app:contentScrim="?androidprv:attr/colorSurfaceHeader"
            app:maxLines="3"
            app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
            app:scrimAnimationDuration="50"
            app:scrimVisibleHeightTrigger="@dimen/settingslib_scrim_visible_height_trigger"
            app:statusBarScrim="@null"
            app:titleCollapseMode="fade"
            app:collapsedTitleTextAppearance="@style/CollapsingToolbarTitle.Collapsed"
            app:expandedTitleTextAppearance="@style/CollapsingToolbarTitle.Expanded"
            app:expandedTitleMarginStart="@dimen/expanded_title_margin_start"
            app:expandedTitleMarginEnd="@dimen/expanded_title_margin_end"
            app:toolbarId="@id/action_bar">

            <Toolbar
                android:id="@+id/action_bar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:theme="?android:attr/actionBarTheme"
                android:transitionName="shared_element_view"
                app:layout_collapseMode="pin"/>

        </com.google.android.material.appbar.CollapsingToolbarLayout>
    </com.google.android.material.appbar.AppBarLayout>

    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>