Can'；t使用Android的aSmack library创建多用户聊天室（MUC）：“；packet.DefaultPacketExtension不能强制转换为packet.MUCUser“；

对于一个应用程序，我需要能够创建一个多用户聊天室并加入它。聊天服务器是openfire服务器

我曾经有：

MultiUserChat chat = new MultiUserChat(connection, roomName + "@conference.localhost");
chat.join(nickname);

当房间不存在时，它会创建房间并连接。但是，下一个用户无法加入。他得到的是404，收件人不可用（404）。这说明聊天室被锁上了

然后我在文档中找到了代码，并尝试了以下操作：

chat.create(nickname);

// Send an empty room configuration form which indicates that we want
// an instant room
chat.sendConfigurationForm(new Form(Form.TYPE_SUBMIT));

但是，当我尝试执行此命令时，它会在logcat中显示以下错误：

03-02 12:04:12.890: E/AndroidRuntime(20872): FATAL EXCEPTION:

 AsyncTask #3 03-02 12:04:12.890: E/AndroidRuntime(20872):

 java.lang.RuntimeException: An error occured while executing
 doInBackground() 
03-02 12:04:12.890: E/AndroidRuntime(20872): Caused
 by: java.lang.ClassCastException:

 org.jivesoftware.smack.packet.DefaultPacketExtension cannot be cast to
 org.jivesoftware.smackx.packet.MUCUser 03-02 12:04:12.890:
 E/AndroidRuntime(20872):   at
 org.jivesoftware.smackx.muc.MultiUserChat.getMUCUserExtension(MultiUserChat.java:2002)
 03-02 12:04:12.890: E/AndroidRuntime(20872):   at
 org.jivesoftware.smackx.muc.MultiUserChat.create(MultiUserChat.java:364)
 03-02 12:04:12.890: E/AndroidRuntime(20872):   at
 be.xios.crs.pivi.managers.XmppManager.createOrJoinChatGroup(XmppManager.java:116)

---

希望有人能在这方面帮助我，并给我一些建议。

编辑2015年4月4日：调用

SmackAndroid.init（上下文）

对于Smack 4.1（或更高版本）不再是必需的。事实上，

SmackAndroid

已经不存在了

org.jivesoftware.smack.packet.DefaultPacketExtension不能强制转换为org.jivesoftware.smackx.packet.MUCUser

通常表示您没有初始化aSmack的静态代码，该代码负责为smack的各种数据包（和数据包扩展）类注册smack提供程序

对于大多数aSmack版本，只需调用

SmackAndroid.init(Context ctx)

将完成此操作。

使用此代码

MultiUserChat muc = new MultiUserChat(connection, "roomname@<server>");
muc.create("nickname1");

Form form = muc.getConfigurationForm();
Form submitForm = form.createAnswerForm();
for (Iterator fields = form.getFields();fields.hasNext();){
  FormField field = (FormField) fields.next();
    if(!FormField.TYPE_HIDDEN.equals(field.getType()) && field.getVariable()!= null){
        submitForm.setDefaultAnswer(field.getVariable());
    }
}               
submitForm.setAnswer("muc#roomconfig_publicroom", true);
muc.sendConfigurationForm(submitForm);
muc.join("nickname1");
}catch (Exception e) {
   e.printStackTrace();
}

---

只需使用-configure（ProviderManager.getInstance（））调用此方法

您是否按照aSmack自述文件的要求正确初始化了提供程序？@Flow as in create the XMPPConnection and login？不，我不知道您使用的是哪种aSmack版本或fork，但当前版本附带了一个READMEI，添加了行SmackAndroid.init（this）；就像自述文件建议的那样，如果你对此做出回答，我会接受。非常感谢@Flowsimple在关闭应用程序时调用init并给出错误<代码>12-31 16:30:56.588:E/ActivityThread（14185）：Activity com.demo.xmpp.xmppchatdemActivity已泄漏IntentReceiver org.jivesoftware.smack.SmackAndroid$ConnectivtyChangedReceiver@43e6cb08原来是在这里注册的。是否缺少对unregisterReceiver（）的调用

SmackAndroid smack=SmackAndroid.init（上下文）。在onDestroy中：
smack.onDestroy（）
@你能帮我解决斯迈勒问题吗，我的问题就在这个链接上
public void configure(ProviderManager pm) {

    //  Private Data Storage
    pm.addIQProvider("query","jabber:iq:private", new PrivateDataManager.PrivateDataIQProvider());

    //  Time
    try {
        pm.addIQProvider("query","jabber:iq:time", Class.forName("org.jivesoftware.smackx.packet.Time"));
    } catch (ClassNotFoundException e) {
        Log.w("TestClient", "Can't load class for org.jivesoftware.smackx.packet.Time");
    }

    //  Roster Exchange
    pm.addExtensionProvider("x","jabber:x:roster", new RosterExchangeProvider());

    //  Message Events
    pm.addExtensionProvider("x","jabber:x:event", new MessageEventProvider());

    //  Chat State
    pm.addExtensionProvider("active","http://jabber.org/protocol/chatstates", new ChatStateExtension.Provider());
    pm.addExtensionProvider("composing","http://jabber.org/protocol/chatstates", new ChatStateExtension.Provider()); 
    pm.addExtensionProvider("paused","http://jabber.org/protocol/chatstates", new ChatStateExtension.Provider());
    pm.addExtensionProvider("inactive","http://jabber.org/protocol/chatstates", new ChatStateExtension.Provider());
    pm.addExtensionProvider("gone","http://jabber.org/protocol/chatstates", new ChatStateExtension.Provider());

    //  XHTML
    pm.addExtensionProvider("html","http://jabber.org/protocol/xhtml-im", new XHTMLExtensionProvider());

    //  Group Chat Invitations
    pm.addExtensionProvider("x","jabber:x:conference", new GroupChatInvitation.Provider());

    //  Service Discovery # Items    
    pm.addIQProvider("query","http://jabber.org/protocol/disco#items", new DiscoverItemsProvider());

    //  Service Discovery # Info
    pm.addIQProvider("query","http://jabber.org/protocol/disco#info", new DiscoverInfoProvider());

    //  Data Forms
    pm.addExtensionProvider("x","jabber:x:data", new DataFormProvider());

    //  MUC User
    pm.addExtensionProvider("x","http://jabber.org/protocol/muc#user", new MUCUserProvider());

    //  MUC Admin    
    pm.addIQProvider("query","http://jabber.org/protocol/muc#admin", new MUCAdminProvider());

    //  MUC Owner    
    pm.addIQProvider("query","http://jabber.org/protocol/muc#owner", new MUCOwnerProvider());

    //  Delayed Delivery
    pm.addExtensionProvider("x","jabber:x:delay", new DelayInformationProvider());

    //  Version
    try {
        pm.addIQProvider("query","jabber:iq:version", Class.forName("org.jivesoftware.smackx.packet.Version"));
    } catch (ClassNotFoundException e) {
        //  Not sure what's happening here.
    }

    //  VCard
    pm.addIQProvider("vCard","vcard-temp", new VCardProvider());

    //  Offline Message Requests
    pm.addIQProvider("offline","http://jabber.org/protocol/offline", new OfflineMessageRequest.Provider());

    //  Offline Message Indicator
    pm.addExtensionProvider("offline","http://jabber.org/protocol/offline", new OfflineMessageInfo.Provider());

    //  Last Activity
    pm.addIQProvider("query","jabber:iq:last", new LastActivity.Provider());

    //  User Search
    pm.addIQProvider("query","jabber:iq:search", new UserSearch.Provider());

    //  SharedGroupsInfo
    pm.addIQProvider("sharedgroup","http://www.jivesoftware.org/protocol/sharedgroup", new SharedGroupsInfo.Provider());

    //  JEP-33: Extended Stanza Addressing
    pm.addExtensionProvider("addresses","http://jabber.org/protocol/address", new MultipleAddressesProvider());

    //   FileTransfer
    pm.addIQProvider("si","http://jabber.org/protocol/si", new StreamInitiationProvider());

    pm.addIQProvider("query","http://jabber.org/protocol/bytestreams", new BytestreamsProvider());

    //  Privacy
    pm.addIQProvider("query","jabber:iq:privacy", new PrivacyProvider());
    pm.addIQProvider("command", "http://jabber.org/protocol/commands", new AdHocCommandDataProvider());
    pm.addExtensionProvider("malformed-action", "http://jabber.org/protocol/commands", new AdHocCommandDataProvider.MalformedActionError());
    pm.addExtensionProvider("bad-locale", "http://jabber.org/protocol/commands", new AdHocCommandDataProvider.BadLocaleError());
    pm.addExtensionProvider("bad-payload", "http://jabber.org/protocol/commands", new AdHocCommandDataProvider.BadPayloadError());
    pm.addExtensionProvider("bad-sessionid", "http://jabber.org/protocol/commands", new AdHocCommandDataProvider.BadSessionIDError());
    pm.addExtensionProvider("session-expired", "http://jabber.org/protocol/commands", new AdHocCommandDataProvider.SessionExpiredError());
}