我正在为Unity做一个android插件,我需要将XMPP集成到Unity中,因此首先我要尝试创建XMPP的连接并发送和接收消息.它在android中工作正常,我能够发送和接收消息,但是当我导出.jar文件并在Unity中使用时,在创建连接时出现以下错误

SmackInitialization: Could not determine Smack version

java.lang.NullPointerException: lock == null

at java.io.Reader.(Reader.java:64)

at java.io.InputStreamReader.(InputStreamReader.java:122)

at java.io.InputStreamReader.(InputStreamReader.java:57)

at org.jivesoftware.smack.SmackInitialization.(SmackInitialization.java:61)

at org.jivesoftware.smack.SmackConfiguration.getVersion(SmackConfiguration.java:96)

at org.jivesoftware.smack.ConnectionConfiguration.(ConnectionConfiguration.java:38)

at com.arvaan.myplugins.ToastExample.connectXMPP(ToastExample.java:99)

at com.unity3d.player.UnityPlayer.nativeRender(Native Method)

at com.unity3d.player.UnityPlayer.a(Unknown Source)

at com.unity3d.player.UnityPlayer$b$1.handleMessage(Unknown Source)

at android.os.Handler.dispatchMessage(Handler.java:98)

at android.os.Looper.loop(Looper.java:234)

at com.unity3d.player.UnityPlayer$b.run(Unknown Source)

我不知道Smack的问题是什么,我是Unity的新手,我知道如何在Unity中创建插件和调用方法,但是不知道这是怎么回事.

请检查代码：

public class ToastExample extends UnityPlayerActivity implements ConnectionListener, ChatManagerListener, RosterListener, PingFailedListener, StanzaListener, MessageListener, ChatMessageListener {

private static final String TAG = ToastExample.class.getSimpleName();

private AbstractXMPPConnection mConnection = null;

private ChatManager chatManager;

private Chat chat;

private Context context;

private String userName = "";

private String passWord = "";

private String objectName = "";

private static ToastExample instance;

public ToastExample() {

this.instance = this;

}

public static ToastExample instance() {

if (instance == null) {

instance = new ToastExample();

}

return instance;

}

public void setContext(Context context) { // This is also working fine

Log.e(TAG, "setContext called");

this.context = context;

}

public void showMessage(String message) { // I can able to see toast

Toast.makeText(this.context, message, Toast.LENGTH_SHORT).show();

}

public void connectXMPP(String host, int port, String userName, String passWord) {

Log.e(TAG, "_connectXMPP called");

XMPPTCPConnectionConfiguration.Builder configBuilder = XMPPTCPConnectionConfiguration.builder(); // Here i got error

configBuilder.setUsernameAndPassword(userName, passWord);

...............

...............

}

我在我的插件和Unity中使用以下.Jar文件

smack-core-4.1.4.jar

smack-extensions-4.1.4.jar

smack-im-4.1.4.jar

smack-android-4.1.4.jar

smack-android-extensions-4.1.4.jar

smack-tcp-4.1.4.jar

jxmpp-util-cache-0.4.2.jar

jxmpp-core-0.4.2.jar

jxmpp-jid-0.4.2.jar

jxmpp-stringprep-libidn-0.4.2.jar

minidns-core-0.2.0.jar**

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请帮助我解决此问题,在此先感谢.