asmack在查询用户时,searchForm出现nullpointer的解决办法。

asmack查询用户,searchForm出现nullpointer的解决办法。

原因：

the smack.providers file, usually in /META-INF folder in normal versions of smack, can't be loaded in Android because its jar packaging. So all the providers must be initialized by hand

大概是说由于smack.providers 的文件不能载入asmack中导致的。所以必须我们自己手动载入一个。

 

先复制下面代码：

 

public static 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());

      

}

 

//

在XMPPConnection实例化之前载入就可以解决了。
configure(ProviderManager.getInstance());

 

原文：http://stackoverflow.com/questions/5910219/problem-using-usersearch-in-xmpp-with-asmack?s=6a4867fa-f020-4a42-b1a5-915ea1a47955#new-answer