Android ClassCastException:org.jivesoftware.smack.PacketReader$4在传输文件时不能强制转换为org.jivesoftware.smackx.packet.StreamInitiation

我正在使用Smack和Openfire服务器作为聊天客户端，所有功能都运行良好，如聊天、发送新添加用户的邀请、获取可用用户列表等。当我尝试使用下面的代码将文件从android客户端发送给另一个用户时，我遇到了ClassCastException错误。这给了我一堆错误

ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
if (sdm == null)
sdm = new ServiceDiscoveryManager(connection);
sdm.addFeature("http://jabber.org/protocol/disco#info");
sdm.addFeature("jabber:iq:privacy");
fileTransfer(fileName, recepient.getText().toString() + "/Spark 2.6.3");

public void fileTransfer(String fileName, String destination) throws XMPPException   {

        FileTransferNegotiator.setServiceEnabled(connection,true);
        OutgoingFileTransfer transfer = manager.createOutgoingFileTransfer(destination);
        transfer.sendFile(new File(fileName), "You won't believe this!");
        try {
            Thread.sleep(10000);
        }
        catch(Exception e){
            Toast.makeText(getActivity(), "Exception " + e, Toast.LENGTH_LONG).show();
        }
        System.out.println("Status :: " + transfer.getStatus() + " Error :: " + transfer.getError() + " Exception :: " + transfer.getException());
        System.out.println("Is it done? " + transfer.isDone());
        Toast.makeText(getActivity(), "Status :: " + transfer.getStatus() + " Error :: " + transfer.getError() + " Exception :: " + transfer.getException(), Toast.LENGTH_LONG).show();
        Log.v("ONMESSAGE", "Status :: " + transfer.getStatus() + " Error :: " + transfer.getError() + " Exception :: " + transfer.getException());
    }

当我尝试发送文件时，它会显示在另一端的spark上，但当单击“接受”时，不会启动文件传输，而是显示“传输文件时出错”

在错误日志中，它向我显示以下错误：

07-25 12:08:22.393: E/AndroidRuntime(27708): java.lang.ClassCastException: org.jivesoftware.smack.PacketReader$4 cannot be cast to org.jivesoftware.smackx.packet.StreamInitiation
07-25 12:08:22.393: E/AndroidRuntime(27708):    at org.jivesoftware.smackx.filetransfer.FileTransferNegotiator.negotiateOutgoingTransfer(FileTransferNegotiator.java:401)
07-25 12:08:22.393: E/AndroidRuntime(27708):    at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer.negotiateStream(OutgoingFileTransfer.java:300)
07-25 12:08:22.393: E/AndroidRuntime(27708):    at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer.access$100(OutgoingFileTransfer.java:35)
07-25 12:08:22.393: E/AndroidRuntime(27708):    at org.jivesoftware.smackx.filetransfer.OutgoingFileTransfer$2.run(OutgoingFileTransfer.java:214)
07-25 12:08:22.393: E/AndroidRuntime(27708):    at java.lang.Thread.run(Thread.java:838)

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注意：我正在使用Smack库。

将以下方法添加到类中

public void configure(ProviderManager pm) {   

    pm.addIQProvider("query", "jabber:iq:private",

            new PrivateDataManager.PrivateDataIQProvider());

    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");

    }
    pm.addExtensionProvider("x", "jabber:x:roster",

            new RosterExchangeProvider());
    pm.addExtensionProvider("x", "jabber:x:event",

            new MessageEventProvider());
    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());
    pm.addExtensionProvider("html", "http://jabber.org/protocol/xhtml-im",

            new XHTMLExtensionProvider());

    pm.addExtensionProvider("x", "jabber:x:conference",

            new GroupChatInvitation.Provider());
    pm.addIQProvider("query", "http://jabber.org/protocol/disco#items",
            new DiscoverItemsProvider());

    pm.addIQProvider("query", "http://jabber.org/protocol/disco#info",

            new DiscoverInfoProvider());
    pm.addExtensionProvider("x", "jabber:x:data", new DataFormProvider());
    pm.addExtensionProvider("x", "http://jabber.org/protocol/muc#user",
            new MUCUserProvider());
    pm.addIQProvider("query", "http://jabber.org/protocol/muc#admin",
            new MUCAdminProvider());

    pm.addIQProvider("query", "http://jabber.org/protocol/muc#owner",
            new MUCOwnerProvider());
    pm.addExtensionProvider("x", "jabber:x:delay",
            new DelayInformationProvider());
    try {

        pm.addIQProvider("query", "jabber:iq:version",

                Class.forName("org.jivesoftware.smackx.packet.Version"));

    } catch (ClassNotFoundException e) {

        // Not sure what's happening here.

    }
    pm.addIQProvider("vCard", "vcard-temp", new VCardProvider());
    pm.addIQProvider("offline", "http://jabber.org/protocol/offline",

            new OfflineMessageRequest.Provider());
    pm.addExtensionProvider("offline","http://jabber.org/protocol/offline",new OfflineMessageInfo.Provider());
    pm.addIQProvider("query", "jabber:iq:last", new LastActivity.Provider());
    pm.addIQProvider("query", "jabber:iq:search", new UserSearch.Provider());
    pm.addIQProvider("sharedgroup","http://www.jivesoftware.org/protocol/sharedgroup",new SharedGroupsInfo.Provider());
    pm.addExtensionProvider("addresses","http://jabber.org/protocol/address",new MultipleAddressesProvider());
    pm.addIQProvider("si", "http://jabber.org/protocol/si",new StreamInitiationProvider());
    pm.addIQProvider("query", "http://jabber.org/protocol/bytestreams",
            new BytestreamsProvider());
    pm.addIQProvider("query", "jabber:iq:privacy", new PrivacyProvider());

}

在调用connect函数之前。像这样调用方法

configure(ProviderManager.getInstance());

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你为什么睡你的帖子？别介意我找到了答案。事实上，我以前在某个地方读过帖子，只是研究一下，找到了答案。我在下面发布答案。对于（a）Smack的最新版本，不需要手动配置ProviderManager。这表明您使用的是旧的aSmack版本，或者如果需要，您没有按照自述文件中的说明进行操作。@Flow可能是这样的……这对于本文来说也是一个有用的信息……事实上，一年前，我制作了一个没有文件传输的客户端，现在我想为文件传输配置它，这就是为什么不能使用它的原因能够改变到最新的图书馆…我也会改变…谢谢你的宝贵信息