text: class Activity:
      def __init__(self, name, permission=None, exported=False, is_main=False):
          self.name = name
          self.exported= exported
          self.permission = permission
          self.is_main_activity = is_main
          self.intent_filters = []
      def append_intent_filter(self, intent_filter):
          self.intent_filters.append(intent_filter)
      def clear_intent_filter(self):
          self.intent_filters.clear()