public function indexAction()
 {
     // Make form
     $this->view->form = $form = new Activity_Form_Admin_Settings_General();
     // Populate settings
     $settings = Engine_Api::_()->getApi('settings', 'core');
     $values = $settings->activity;
     unset($values['allowed']);
     $form->populate($values);
     if (!$this->getRequest()->isPost()) {
         return;
     }
     if (!$form->isValid($this->getRequest()->getPost())) {
         return;
     }
     // Process
     $values = $form->getValues();
     // Save settings
     $settings->activity = $values;
     $form->addNotice('Your changes have been saved.');
 }