themes.xml

<resources>
    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.DayNight.NoActionBar">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="android:colorControlNormal">@color/colorAccent</item>
    </style>

    <style name="LaunchTheme" parent="AppTheme">
        <item name="android:windowBackground">@drawable/launch_screen</item>
    </style>

</resources>