在带有 aSmack 的 XMPP 中使用 UserSearch 时，getSearchForm 返回 null

Question

我有这段代码，几乎没有从示例中修改过：

                UserSearchManager usm = new UserSearchManager(conn);
                Form searchForm = usm.getSearchForm("search.myserver.com");
                Form answerForm = searchForm.createAnswerForm();
                answerForm.setAnswer("Username", true);
                answerForm.setAnswer("search", contact.getJid());
                ReportedData data = usm.getSearchResults(answerForm, "search.myserver.com");

这在桌面环境中完美运行，使用 Smack 库，但我无法让它在 Android 中运行（我必须使用 asmack）。

问题是 searchForm 为 null，因为 getSearchForm 返回 null。这似乎很奇怪，因为我似乎找不到任何有关该方法应返回 null 的情况的文档。

如果有帮助，服务器是 Openfire。

Answer 1

2014 年 4 月更新

下面的原始答案包含现在过时的信息。从 aSmack 0.8 开始，不再需要手动配置提供程序管理器。按照 aSmack README 的指示调用 SmackAndroid.init(Context)，负责所有必要的初始化。

原答案

最后，这个问题对所有人来说都是全球性的。这似乎是一个已知问题：smack.providers 文件，通常在普通版本的 smack 中的 /META-INF 文件夹中，由于其 jar 包装，无法在 Android 中加载。所以必须手动初始化所​​有提供程序，如 Mike Ryan 在此线程中的回答所示：http://community.igniterealtime.org/message/201866#201866

我删除了对我不起作用的东西，这就是结果。

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());

}

我只评论了几行，瞧。这应该在实例化 XMPPConnection 之前调用，如下所示：

    configure(ProviderManager.getInstance());

现在我将不得不处理我的其他问题，但至少这个问题已经解决了:)

Answer 2

在代码示例XmppTool.java中，getSearchFrom用于searchUsers()。

public List<User> searchUsers(String serverDomain,String userName){
        List<User> list = new ArrayList<User>();
        UserSearchManager userSearchManager = new UserSearchManager(con);
        try {
            Form searchForm = userSearchManager.getSearchForm("search."+serverDomain);
            Form answerForm = searchForm.createAnswerForm();
            answerForm.setAnswer("Username", true);
            answerForm.setAnswer("Name", true);
            answerForm.setAnswer("search", userName);
            ReportedData data = userSearchManager.getSearchResults(answerForm, "search."+serverDomain);
            Iterator<Row> rows = data.getRows();
            while(rows.hasNext()){
                User user = new User();
                Row row = rows.next();
                user.setUserName(row.getValues("Username").next().toString());
                user.setName(row.getValues("Name").next().toString());
                SLog.i(tag, user.toString());
                list.add(user);
            }
        } catch (XMPPException e) {
            SLog.e(tag, Log.getStackTraceString(e));
        }
        return list;
    }

您可以参考java文件中的全局设置来修复您的代码。

Answer 3

UserSearchManager的Javadoc解释如下：

UserSearchManager 是基于 Jabber 搜索服务 (JEP-055) 构建的外观，允许搜索 Jabber 服务器上的存储库。此实现允许搜索实现的透明性（DataForms 或无 DataForms），但允许用户简单地使用 DataForm 模型来支持这两种类型。

 XMPPConnection con = new XMPPConnection("jabber.org");
 con.login("john", "doe");
 UserSearchManager search = new UserSearchManager(con, "users.jabber.org");
 Form searchForm = search.getSearchForm();
 Form answerForm = searchForm.createAnswerForm();
 answerForm.setAnswer("last", "DeMoro");
 ReportedData data = search.getSearchResults(answerForm);
 // Use Returned Data