nativescript-demo/App_Resources/Android/src/main/res/values/styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- theme to use FOR launch screen-->
    <style name="LaunchScreenThemeBase" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="toolbarStyle">@style/NativeScriptToolbarStyle</item>

        <item name="colorPrimary">@color/ns_primary</item>
        <item name="colorPrimaryDark">@color/ns_primaryDark</item>
        <item name="colorAccent">@color/ns_accent</item>

        <item name="android:windowBackground">@drawable/splash_screen</item>

        <item name="android:windowActionBarOverlay">true</item>
        <item name="android:windowTranslucentStatus">true</item>
    </style>

    <style name="LaunchScreenTheme" parent="LaunchScreenThemeBase">
    </style>

    <!-- theme to use AFTER launch screen is loaded-->
    <style name="AppThemeBase" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="toolbarStyle">@style/NativeScriptToolbarStyle</item>

        <item name="colorPrimary">@color/ns_primary</item>
        <item name="colorPrimaryDark">@color/ns_primaryDark</item>
        <item name="colorAccent">@color/ns_accent</item>
    </style>

    <style name="AppTheme" parent="AppThemeBase">
    </style>

    <!-- theme for action-bar -->
    <style name="NativeScriptToolbarStyleBase" parent="Widget.AppCompat.Toolbar">
        <item name="android:background">@color/ns_primary</item>
        <item name="theme">@style/ThemeOverlay.AppCompat.ActionBar</item>
        <item name="popupTheme">@style/ThemeOverlay.AppCompat</item>
    </style>

    <style name="NativeScriptToolbarStyle" parent="NativeScriptToolbarStyleBase">
    </style>
</resources>