car-ui-lib/referencedesign/res/values/styles.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

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 See the License for the specific language governing permissions and
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<resources xmlns:android="http://schemas.android.com/apk/res/android">
    <style name="Widget.CarUi" parent="android:Widget.DeviceDefault"/>

    <style name="Widget.CarUi.Toolbar"/>

    <style name="Widget.CarUi.Toolbar.NavIconContainer">
        <item name="android:layout_marginVertical">10dp</item>
        <item name="android:layout_marginHorizontal">18dp</item>
        <item name="android:background">@drawable/car_ui_toolbar_menu_item_icon_ripple</item>
    </style>

    <style name="Widget.CarUi.Toolbar.NavIcon">
        <item name="android:tint">@color/car_ui_text_color_primary</item>
        <item name="android:src">@drawable/car_ui_icon_arrow_back</item>
    </style>

    <style name="Widget.CarUi.Toolbar.MenuItem"/>

    <style name="Widget.CarUi.Toolbar.MenuItem.IndividualContainer">
        <item name="android:minHeight">76dp</item>
        <item name="android:minWidth">76dp</item>
        <item name="android:layout_gravity">center</item>
        <item name="android:focusable">true</item>
    </style>

    <style name="Widget.CarUi.Button.Borderless.Colored"
           parent="android:Widget.DeviceDefault.Button.Borderless.Colored"/>

    <style name="Widget.CarUi.Toolbar.TextButton" parent="Widget.CarUi.Button.Borderless.Colored">
        <item name="android:drawableTint">@color/car_ui_toolbar_menu_item_icon_color</item>
        <item name="android:drawablePadding">10dp</item>
        <item name="android:maxWidth">350dp</item>
    </style>

    <style name="Widget.CarUi.Toolbar.TextButton.WithIcon">
        <item name="android:textColor">@color/car_ui_toolbar_menu_item_icon_color</item>
    </style>
</resources>