问题描述
即时通讯正在开发一个聊天应用程序，在FileTransfers，我可以成功地发送文件到火花的客户端，但在听，我收到NullPointerException异常错误在谈判的一部分，这里是火花收到Android客户端的智商：
im am Developing a Chat app, at the FileTransfers, i can successfully send file to a spark client, but at the listening, i am receiving NullPointerException error at the negotiating part, here is the IQ received by android client from spark:
RCV (0): <iq id="dnkUY-33" to="reza@reza-hp/Smack" from="admin@reza-hp/Spark 2.6.3"
type="set">
<si xmlns="http://jabber.org/protocol/si" id="jsi_5267323957851897853"
mime-type="image/jpeg" profile="http://jabber.org/protocol/si/profile/file-
transfer">
<file xmlns="http://jabber.org/protocol/si/profile/file-transfer"
name="635px-Food.jpg" size="45135">
<desc>Sending file</desc>
</file><feature
xmlns="http://jabber.org/protocol/feature-neg"><x xmlns="jabber:x:data" type="form">
<field var="stream-method" type="list-single">
<option><value>http://jabber.org/protocol/bytestreams</value></option><option>
<value>http://jabber.org/protocol/ibb</value></option></field></x></feature>
</si></iq>
和以下是错误的打印：
07-01 13:40:49.075: W/System.err(1986): java.lang.NullPointerException
07-01 13:40:49.075: W/System.err(1986):
atorg.jivesoftware.smackx.filetransfer.
IncomingFileTransfer.negotiateStream(IncomingFileTransfer.java:173)
07-01 13:40:49.075: W/System.err(1986): at
org.jivesoftware.smackx.filetransfer.
IncomingFileTransfer.access$100(IncomingFileTransfer.java:45)
07-01 13:40:49.075: W/System.err(1986): at
org.jivesoftware.smackx.filetransfer.
IncomingFileTransfer$1.run(IncomingFileTransfer.java:122)
07-01 13:40:49.085: W/System.err(1986): at java.lang.Thread.run(Thread.java:841)
唯一的例外是空的，但根据所提供的智商，似乎传输类型是流启动，所以我想可能是asmack犯规发现它在默认情况下，没有任何一个有此任何解决方案，或者知道如何发现流启动？非常感谢提前3;哦，并且使用的Openfire服务器IM：）
the Exception is null, but According to the IQ provided, it seems transfer Type is a " Stream Initiation " , so i thought may be asmack doesnt discover it by default, does any one has any solution for this, or knows how to discover "Stream Initiation" ? thanks alot in advance <3oh and im using OpenFire server :)
推荐答案
OOOkkk，只是找到了解决办法，我是对这个问题，很抱歉aSmack疲软，只是添加该字段：
OOOkkk, just found the solution, i was Right about the problem, am sorry for aSmack's weak IT, just add this field :
ServiceDiscoveryManager.getInstanceFor(connection).addFeature("jabber.org/protocol
/si");
让你aSmack支持StreamInitiation ....相信这解决了很多的脂肪酶的问题。
so your aSmack supports the StreamInitiation.... am sure this Solves alot of ppl's problems
还添加文件传输提供商连接后，它使不同。而我的意思是，当你永远相信，当连接已经连自己正在读进来试一试
also add file transfer providers AFTER connection, it makes difference. and by that i mean when ever you are sure they are readen when connection is already connected like "try"
和最重要的部分：使用Asmack 8-4.0.0 RC-1是肯定的，最适合用于文件传输的任何问题，生病很乐意帮助，经过1 fckin周尝试我想我学到了很多东西。谢谢
and most important part : use Asmack 8-4.0.0 rc-1 for sure,Best suited for file transfers any questions ill be glad to help, after 1 fckin week trying i think i learnt alot. thanks
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