car_product/overlay/frameworks/base/packages/SystemUI/res/values/config.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
**
** Copyright 2016, 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.
*/
-->

<!-- Resource overrides for car system ui. -->
<resources>

    <!-- Notifications on the car should not show the gear icon. Swiping should only dismiss the
         cards. -->
    <bool name="config_showNotificationGear">false</bool>

    <!-- No need to draw a background around a notification because there is no gear icon. -->
    <bool name="config_drawNotificationBackground">false</bool>

    <!-- The notification shade should only be shown on a facet click and not by dragging. -->
    <bool name="config_enableNotificationShadeDrag">false</bool>

    <!-- There should not be the ability to clear all notifications with a button. -->
    <bool name="config_enableNotificationsClearAll">false</bool>

    <!-- Hide the notification shelf so that the cards in the notification center scroll smoothly
         off-screen. -->
    <bool name="config_showNotificationShelf">false</bool>

    <!-- The notifications should always fade when being dismissed. -->
    <bool name="config_fadeNotificationsOnDismiss">true</bool>

    <!-- The entire notification row should be translated because the cards are smaller than the
         width of the screen. If the row is not translated, then they will be clipped. -->
    <bool name="config_translateNotificationContentsOnSwipe">false</bool>

    <!-- The notifications should fade as they are being swiped off screen. -->
    <bool name="config_fadeDependingOnAmountSwiped">true</bool>

     <!-- The expand icon should be displayed at the top right corner of the notifications. -->
    <bool name="config_showNotificationExpandButtonAtEnd">true</bool>

    <!-- A notification card that has been scrolled off screen should not be clipped in height. This
         maintains the illusion that the cards are being scrolled underneath the status bar
         shelf. -->
    <bool name="config_clipNotificationScrollToTop">false</bool>

    <!-- The auto notification have rounded corners. Ensure that any content is clipped to these
         corners. -->
    <bool name="config_clipNotificationsToOutline">true</bool>

    <!-- Notifications should always be in their expanded state so that the actions are visible.
         This will make it easier for a auto user to interact with them. -->
    <bool name="config_alwaysExpandNonGroupedNotifications">true</bool>

    <!-- Auto does not allow notifications to be toggled to and from their expanded states to
         reduce driver distraction. -->
    <bool name="config_enableNonGroupedNotificationExpand">false</bool>

    <!-- There should always be a dividing line between notifications. -->
    <bool name="config_showDividersWhenGroupNotificationExpanded">true</bool>

    <!--- Hide the dividing lines when the notification group is expanding. -->
    <bool name="config_hideDividersDuringTransition">true</bool>

    <!-- Child notifications are displayed with no dividing space between them in auto, so disable
         the shadow. -->
    <bool name="config_enableShadowOnChildNotifications">false</bool>

    <!-- Keep the notification background when the container has been expanded. The children will
         expand inline within the container, so it can keep its original background. -->
    <bool name="config_showGroupNotificationBgWhenExpanded">true</bool>
</resources>