public function getDefaultAppActivity():Renderer
    {
        $default = array();
        $file = (array) JL::open(FEnv::get("framework.config.core.apps.file"));
        foreach ($file as $one) {
            if ($one->isdefault == "yes") {
                $default = $one;
                break;
            }
        }
        return ((new Renderer())->jsonRenderer(array("code" => 200, "results" => $default)));
    }