java - 在 XMPP 中使用 UserSearch 和 aSmack 时，getSearchForm 返回 null

我有这个代码，几乎没有从示例中修改:

                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 中工作(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关于该方法应该返回 null 的情况的文档。

服务器是 Openfire，如果有帮助的话。

最佳答案

更新 04/2014

下面的原始答案包含现在旧的和过时的信息。从 aSmack 0.8 开始，不再需要手动配置提供程序管理器。调用 SmackAndroid.init(Context) 作为 aSmack README 告诉你做的，负责所有必要的初始化。

原始答案

最后，这个问题对所有人来说都是全局性的。这似乎是一个已知问题:smack.providers 文件，通常在 smack 的正常版本中的/META-INF 文件夹中，无法在 Android 中加载，因为它的 jar 包装。因此，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:)