data/res/drawable-car/car_button_background.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2019 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.
-->
<!-- Default background styles for car buttons when enabled/disabled,
     focused/unfocused, and pressed/unpressed -->
<!-- TODO(b/175161842) Add rotary fill color -->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:state_enabled="false">
        <shape android:shape="rectangle">
            <corners android:radius="@*android:dimen/car_button_radius"/>
            <solid android:color="@*android:color/car_grey_300"/>
            <stroke android:width="8dp"
                    android:color="#0059B3"/>
        </shape>
    </item>
    <item android:state_focused="true" android:state_pressed="true" android:state_ux_restricted="true">
        <shape android:shape="rectangle">
            <corners android:radius="@*android:dimen/car_button_radius"/>
            <solid android:color="@*android:color/car_grey_300"/>
            <stroke android:width="4dp"
                    android:color="#0059B3"/>
        </shape>
    </item>
    <item android:state_focused="true" android:state_ux_restricted="true">
        <shape android:shape="rectangle">
            <corners android:radius="@*android:dimen/car_button_radius"/>
            <solid android:color="@*android:color/car_grey_300"/>
            <stroke android:width="8dp"
                    android:color="#0059B3"/>
        </shape>
    </item>
    <item android:state_focused="true" android:state_pressed="true">
        <shape android:shape="rectangle">
            <corners android:radius="@*android:dimen/car_button_radius"/>
            <solid android:color="?android:attr/colorButtonNormal"/>
            <stroke android:width="4dp"
                    android:color="#0059B3"/>
        </shape>
    </item>
    <item android:state_focused="true">
        <shape android:shape="rectangle">
            <corners android:radius="@*android:dimen/car_button_radius"/>
            <solid android:color="?android:attr/colorButtonNormal"/>
            <stroke android:width="8dp"
                    android:color="#0059B3"/>
        </shape>
    </item>
    <item android:state_enabled="false">
        <shape android:shape="rectangle">
            <corners android:radius="@*android:dimen/car_button_radius"/>
            <solid android:color="@*android:color/car_grey_300"/>
        </shape>
    </item>
    <item android:state_ux_restricted="true">
        <shape android:shape="rectangle">
            <corners android:radius="@*android:dimen/car_button_radius"/>
            <solid android:color="@*android:color/car_grey_300"/>
        </shape>
    </item>
    <item>
        <ripple android:color="?android:attr/colorControlHighlight">
            <item>
                <shape android:shape="rectangle">
                    <corners android:radius="@*android:dimen/car_button_radius"/>
                    <solid android:color="?android:attr/colorButtonNormal"/>
                </shape>
            </item>
        </ripple>
    </item>
</selector>