这是我第一次使用Android / Java。我正在尝试运行此基本代码，但不断出现以下错误：

“找不到方法引用的类’org.jivesoftware.smack.ConnectionConfiguration’”

• 我的代码：

        package message.pack;
    import org.jivesoftware.smack.ConnectionConfiguration;
    import org.jivesoftware.smack.XMPPConnection;
    import org.jivesoftware.smack.XMPPException;

    import android.app.Activity;
    import android.os.Bundle;

    public class ThesimpleigniteandroidActivity extends Activity {
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

        }

                  public static void main(String[] args) {
                  ConnectionConfiguration conf = new     ConnectionConfiguration("jabber.com",5222);
                  XMPPConnection connection = new XMPPConnection(conf);
                      try {
                      connection.connect();
                      connection.login("myusername", "mypassword");
                      } catch (XMPPException e) {
                      e.printStackTrace();
                      } finally {
                              connection.disconnect();
                      }
                      }
                      }

我正在使用此页面上的smack.jar：

http://vidorsolutions.blogspot.com/2011/01/writing-xmppjabber-chat-
application-for.html?m=1

谁能告诉我我在做什么错？