car-theme-lib/res/values/themes_car.xml

<!-- 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

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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>
    <!-- This theme exists only for defining new attrs relevant to Cars. It should not modify values
     available from {@link android.R.style#Theme_DeviceDefault}. Overriding theme values is allowed
     (e.g. {@link android.R.attr.dialogTheme ?android:dialogTheme} provided the referenced Theme
     can be easily overlaid.-->
    <style name="Theme.CarDefaultBase" parent="android:Theme.DeviceDefault">
        <item name="android:dialogTheme">@style/Theme.CarDefault.Dialog</item>
        <item name="android:alertDialogTheme">@style/Theme.CarDefault.Dialog.Alert</item>
    </style>
    <style name="Theme.CarDefaultBase.Dialog" parent="android:Theme.DeviceDefault.Dialog">
        <item name="android:alertDialogTheme">@style/Theme.CarDefault.Dialog.Alert</item>
    </style>
    <style name="Theme.CarDefaultBase.Dialog.Alert" parent="android:Theme.DeviceDefault.Dialog.Alert">
        <item name="android:alertDialogTheme">@style/Theme.CarDefault.Dialog.Alert</item>
    </style>

    <!-- Main theme for Car-based activities. This theme will automatically switch to darker colors
     during night mode. -->
    <style name="Theme.CarDefault" parent="Theme.CarDefaultBase"/>

    <style name="Theme.CarDefault.Dialog" parent="Theme.CarDefaultBase.Dialog"/>

    <style name="Theme.CarDefault.Dialog.Alert" parent="Theme.CarDefaultBase.Dialog.Alert"/>

    <!-- Variant of the CarDefault theme with no action bar. -->
    <style name="Theme.CarDefault.NoActionBar">
        <item name="android:windowActionBar">false</item>
        <item name="android:windowNoTitle">true</item>
    </style>

    <!-- Variant of the CarDefault theme that has no title bar and fills the entire screen.  This
     theme sets {@link android.R.attr#windowFullscreen} to true.  -->
    <style name="Theme.CarDefault.NoActionBar.Fullscreen">
        <item name="android:windowFullscreen">true</item>
        <item name="android:windowContentOverlay">@null</item>
    </style>

</resources>