private void parseEvent(final Element event, final Jid from, final Account account) {
   Element items = event.findChild("items");
   String node = items == null ? null : items.getAttribute("node");
   if ("urn:xmpp:avatar:metadata".equals(node)) {
     Avatar avatar = Avatar.parseMetadata(items);
     if (avatar != null) {
       avatar.owner = from.toBareJid();
       if (mXmppConnectionService.getFileBackend().isAvatarCached(avatar)) {
         if (account.getJid().toBareJid().equals(from)) {
           if (account.setAvatar(avatar.getFilename())) {
             mXmppConnectionService.databaseBackend.updateAccount(account);
           }
           mXmppConnectionService.getAvatarService().clear(account);
           mXmppConnectionService.updateConversationUi();
           mXmppConnectionService.updateAccountUi();
         } else {
           Contact contact = account.getRoster().getContact(from);
           contact.setAvatar(avatar);
           mXmppConnectionService.getAvatarService().clear(contact);
           mXmppConnectionService.updateConversationUi();
           mXmppConnectionService.updateRosterUi();
         }
       } else {
         mXmppConnectionService.fetchAvatar(account, avatar);
       }
     }
   } else if ("http://jabber.org/protocol/nick".equals(node)) {
     Element i = items.findChild("item");
     Element nick = i == null ? null : i.findChild("nick", "http://jabber.org/protocol/nick");
     if (nick != null && nick.getContent() != null) {
       Contact contact = account.getRoster().getContact(from);
       contact.setPresenceName(nick.getContent());
       mXmppConnectionService.getAvatarService().clear(account);
       mXmppConnectionService.updateConversationUi();
       mXmppConnectionService.updateAccountUi();
     }
   } else if (AxolotlService.PEP_DEVICE_LIST.equals(node)) {
     Log.d(
         Config.LOGTAG,
         AxolotlService.getLogprefix(account)
             + "Received PEP device list update from "
             + from
             + ", processing...");
     Element item = items.findChild("item");
     Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
     AxolotlService axolotlService = account.getAxolotlService();
     axolotlService.registerDevices(from, deviceIds);
     mXmppConnectionService.updateAccountUi();
   }
 }
  public void parseContactPresence(final PresencePacket packet, final Account account) {
    final PresenceGenerator mPresenceGenerator = mXmppConnectionService.getPresenceGenerator();
    final Jid from = packet.getFrom();
    if (from == null) {
      return;
    }
    final String type = packet.getAttribute("type");
    final Contact contact = account.getRoster().getContact(from);
    if (type == null) {
      final String resource = from.isBareJid() ? "" : from.getResourcepart();
      contact.setPresenceName(packet.findChildContent("nick", "http://jabber.org/protocol/nick"));
      Avatar avatar = Avatar.parsePresence(packet.findChild("x", "vcard-temp:x:update"));
      if (avatar != null && !contact.isSelf()) {
        avatar.owner = from.toBareJid();
        if (mXmppConnectionService.getFileBackend().isAvatarCached(avatar)) {
          if (contact.setAvatar(avatar)) {
            mXmppConnectionService.getAvatarService().clear(contact);
            mXmppConnectionService.updateConversationUi();
            mXmppConnectionService.updateRosterUi();
          }
        } else {
          mXmppConnectionService.fetchAvatar(account, avatar);
        }
      }
      int sizeBefore = contact.getPresences().size();

      final Element show = packet.findChild("show");
      final Element caps = packet.findChild("c", "http://jabber.org/protocol/caps");
      final Presence presence = Presence.parse(show, caps);
      contact.updatePresence(resource, presence);
      if (presence.hasCaps() && Config.REQUEST_DISCO) {
        mXmppConnectionService.fetchCaps(account, from, presence);
      }

      PgpEngine pgp = mXmppConnectionService.getPgpEngine();
      Element x = packet.findChild("x", "jabber:x:signed");
      if (pgp != null && x != null) {
        Element status = packet.findChild("status");
        String msg = status != null ? status.getContent() : "";
        contact.setPgpKeyId(pgp.fetchKeyId(account, msg, x.getContent()));
      }
      boolean online = sizeBefore < contact.getPresences().size();
      updateLastseen(packet, account, false);
      mXmppConnectionService.onContactStatusChanged.onContactStatusChanged(contact, online);
    } else if (type.equals("unavailable")) {
      if (from.isBareJid()) {
        contact.clearPresences();
      } else {
        contact.removePresence(from.getResourcepart());
      }
      mXmppConnectionService.onContactStatusChanged.onContactStatusChanged(contact, false);
    } else if (type.equals("subscribe")) {
      if (contact.getOption(Contact.Options.PREEMPTIVE_GRANT)) {
        mXmppConnectionService.sendPresencePacket(
            account, mPresenceGenerator.sendPresenceUpdatesTo(contact));
      } else {
        contact.setOption(Contact.Options.PENDING_SUBSCRIPTION_REQUEST);
        final Conversation conversation =
            mXmppConnectionService.findOrCreateConversation(
                account, contact.getJid().toBareJid(), false);
        final String statusMessage = packet.findChildContent("status");
        if (statusMessage != null
            && !statusMessage.isEmpty()
            && conversation.countMessages() == 0) {
          conversation.add(
              new Message(
                  conversation, statusMessage, Message.ENCRYPTION_NONE, Message.STATUS_RECEIVED));
        }
      }
    }
    mXmppConnectionService.updateRosterUi();
  }