samples/VirtualDeviceManager/host/res/values/styles.xml

<resources>
    <style name="BottomBarTheme" parent="@style/Theme.MaterialComponents.Light">
        <item name="colorPrimary">@android:color/black</item>
    </style>
    <style name="Theme.AppCompat.Light.NoActionBar.FullScreen" parent="@style/Theme.AppCompat.Light.NoActionBar">
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowActionBar">false</item>
        <item name="android:windowFullscreen">true</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowShowWallpaper">true</item>
    </style>
</resources>