由网友(ˉ人情淡薄怎抵世态炎凉)分享简介：我收到类转换异常，而在Android的创造睦。 E / AndroidRuntime（31002）：java.lang.ClassCastException：产生的原因：org.jivesoftware.smack.packet.DefaultPacketExtensionE / AndroidRuntime（31...

我收到类转换异常，而在Android的创造睦。

  E / AndroidRuntime（31002）：java.lang.ClassCastException：产生的原因：org.jivesoftware.smack.packet.DefaultPacketExtensionE / AndroidRuntime（31002）：在org.jivesoftware.smackx.muc.MultiUserChat.getMUCUserExtension（MultiUserChat.java:2000）E / AndroidRuntime（31002）：在org.jivesoftware.smackx.muc.MultiUserChat.create（MultiUserChat.java:364） 

解决方案

您可以创建用户组按

 公共布尔createGroup（XMPPConnection连接，弦乐组名）{如果（连接== NULL）返回false;尝试{。connection.getRoster（）createGroup（组名）;Log.v（创建组，组名）;返回true;}赶上（例外五）{e.printStackTrace（）;返回false;}} 

如果您wated创建群聊在XMPP试试下面的方法。 （**未选中）

 公共类createMucAT扩展的AsyncTask＆LT;太虚，太虚，MultiUserChat＆GT; {    私人RosterGroup组;    专用连接康恩;    私人字符串的groupId;    私人字符串的groupName;    公共createMucAT（康涅狄格州连接，RosterGroup组，弦乐的groupId，            串组名）{        this.group =组;        this.conn =康恩;        this.groupId =的groupId;        this.groupName =组名;    }    @覆盖    保护MultiUserChat doInBackground（虚空...... PARAMS）{        串groupTag = group.getName（）;        MultiUserChat聊天= NULL;        尝试{            聊天= createGroupChat（康涅狄格州的groupId，groupTag，conn.getUser（））;        }赶上（XMPPException E）{            e.printStackTrace（）;        }        返回聊天;    }    @覆盖    保护无效onPostExecute（MultiUserChat结果）{        super.onPostExecute（结果）;        //这里处理结果    }    私人MultiUserChat createGroupChat（康涅狄格州的连接，字符串的groupId，弦乐组名，字符串昵称）抛出XMPPException {        MultiUserChat睦=新MultiUserChat（康涅狄格州的groupId +@+ ConnectionService.CONFERENCE_IP_ADDRESS）;        muc.create（昵称）;        表格形式= muc.getConfigurationForm（）;        形成submitForm = form.createAnswerForm（）;        对于（迭代器＆LT; FormField＆GT;域= form.getFields（）; fields.hasNext（）;）{            FormField字段=（FormField）fields.next（）;            如果（FormField.TYPE_HIDDEN.equals（field.getType（））及！＆放大器; field.getVariable（）！= NULL）{                submitForm.setDefaultAnswer（field.getVariable（））;                }        }        清单＆LT;串GT;业主=新的ArrayList＆LT;串GT;（）;        owners.add（。ConnectionService.getConnection（）的getUser（）的toString（））;        submitForm.setAnswer（睦＃roomconfig_roomowners，业主）;        submitForm.setAnswer（睦＃roomconfig_persistentroom，真正的）;        submitForm.setAnswer（睦＃roomconfig_roomdesc，组名）;        muc.sendConfigurationForm（submitForm）;        返回睦;    }} 

I am getting class cast exception while creating muc in android.

E/AndroidRuntime(31002): Caused by: java.lang.ClassCastException:   
org.jivesoftware.smack.packet.DefaultPacketExtension
E/AndroidRuntime(31002):    at  
org.jivesoftware.smackx.muc.MultiUserChat.getMUCUserExtension(MultiUserChat.java:2000)
E/AndroidRuntime(31002):    at    
org.jivesoftware.smackx.muc.MultiUserChat.create(MultiUserChat.java:364)

解决方案

You can create user Group by ,

public boolean createGroup(XMPPConnection connection,String groupName) {
if (connection == null)
return false;
try {
connection.getRoster().createGroup(groupName);
Log.v("Group created : ", groupName);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}

If you wated to create Group Chat in xmpp try the following method. (** UNCHECKED )

public class createMucAT extends AsyncTask<Void, Void, MultiUserChat> {

    private RosterGroup group;
    private Connection conn;
    private String groupId;
    private String groupName;


    public createMucAT(Connection conn, RosterGroup group, String groupId,
            String groupName) {
        this.group = group;
        this.conn = conn;
        this.groupId = groupId;
        this.groupName = groupName;


    }

    @Override
    protected MultiUserChat doInBackground(Void... params) {
        String groupTag = group.getName();
        MultiUserChat chat = null;
        try {
            chat = createGroupChat(conn, groupId, groupTag, conn.getUser());
        } catch (XMPPException e) {
            e.printStackTrace();
        }
        return chat;
    }

    @Override
    protected void onPostExecute(MultiUserChat result) {
        super.onPostExecute(result);
        //handle the result here
    }

    private MultiUserChat createGroupChat(Connection conn, String groupId, String groupName, String nickname) throws XMPPException {
        MultiUserChat muc = new MultiUserChat(conn, groupId + "@" + ConnectionService.CONFERENCE_IP_ADDRESS);
        muc.create(nickname);
        Form form = muc.getConfigurationForm();
        Form submitForm = form.createAnswerForm();
        for (Iterator<FormField> fields = form.getFields(); fields.hasNext();) {
            FormField field = (FormField) fields.next();
            if (!FormField.TYPE_HIDDEN.equals(field.getType()) && field.getVariable() != null) {
                submitForm.setDefaultAnswer(field.getVariable());
                }
        }
        List<String> owners = new ArrayList<String>();
        owners.add(ConnectionService.getConnection().getUser().toString());
        submitForm.setAnswer("muc#roomconfig_roomowners", owners);
        submitForm.setAnswer("muc#roomconfig_persistentroom", true);
        submitForm.setAnswer("muc#roomconfig_roomdesc", groupName);
        muc.sendConfigurationForm(submitForm);
        return muc;
    }
}