packages/SystemUI/res/values/attrs_car.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2018 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.
-->

<resources>
    <!-- Allow for custom attribs to be added to a facet button -->
    <declare-styleable name="CarFacetButton">
        <!-- icon to be rendered (drawable) -->
        <attr name="icon" format="reference"/>
        <!-- intent to start when button is click -->
        <attr name="intent" format="string"/>
        <!-- intent to start when a long press has happened -->
        <attr name="longIntent" format="string"/>
        <!-- categories that will be added as extras to the fired intents -->
        <attr name="categories" format="string"/>
        <!-- package names that will be added as extras to the fired intents -->
        <attr name="packages" format="string" />
    </declare-styleable>


    <!-- Allow for custom attribs to be added to a nav button -->
    <declare-styleable name="CarNavigationButton">
        <!-- intent to start when button is click -->
        <attr name="intent" format="string"/>
        <!-- intent to start when a long press has happened -->
        <attr name="longIntent" format="string"/>
        <!-- start the intent as a broad cast instead of an activity if true-->
        <attr name="broadcast" format="boolean"/>
    </declare-styleable>
</resources>