Defining the active theme

Need Help
#1

line
$themeActive = Theme::getActiveTheme()->getDirName();
gets theme name only from .env
If you set another theme in /cms/themes , then $themeActive will still get name from .env

Is this normal behavior of Theme::getActiveTheme()?

#2

Yes, Theme::getActiveTheme() by default returns the theme set in the configuration, typically defined by the active_theme key in config/cms.php, which in turn can be overridden by the .env file setting CMS_ACTIVE_THEME.

This is normal behavior. If you place a new theme in /themes but do not update the active_theme setting or use the php artisan theme:use themename command, Theme::getActiveTheme() will continue to return the one defined in .env or config.

To switch themes programmatically or through Artisan, use:
php artisan theme:use your-new-theme

#3

This will not work When switching themes in the theme manager.

If the user switches or clones a theme in the theme manager, then plugins using Theme::getActiveTheme() will return incorrect data.

The rainlab.sitemap plugin contains the code
\plugins\rainlab\sitemap\handlers\SitemapHandler.php

    public function sitemap()
    {
        $themeActive = Theme::getActiveTheme()->getDirName();

        try {
            $definition = Definition::where('theme', $themeActive)->firstOrFail();
        }
        catch (ModelNotFoundException $e) {
            Log::info(trans('rainlab.sitemap::lang.definition.not_found'));
            return Response::make(View::make('cms::404'), 404);
        }

        return Response::make($definition->generateSitemap())
            ->header('Content-Type', 'application/xml');
    }

it will ignore the list of pages of the customized theme