Android基于XMPP Smack Openfire下学习开发IM(五)连接断开重连

学习过程中大家都碰到过连接被断开的问题给困扰吧，下面教大家如何做到连接断开后，重新连接

首先要创建连接监听器，用来监听连接状态，这里我写了一个类

继承了ConnectionListener，重写了里面5个方法，最重要的两个方法connectionClosed()和connectionClosedOnError()

前者为连接正常断开，后者是连接异常断开，不管是正常还是异常，我们都要监听到

这里写了一个定时器，两秒进行连接一次，注释写的也很清楚，不做太多介绍

要注意的是我把用户名和密码都存到sharePreferences中了

[java] view plaincopyprint?
package com.techrare.listener;

import java.util.Timer;
import java.util.TimerTask;

import org.jivesoftware.smack.ConnectionListener;

import android.util.Log;

import com.techrare.taxicall.MainActivity;
import com.techrare.utils.Utils;
import com.techrare.utils.XmppConnection;

/**

• 连接监听类

• @author Administrator

• */
  public class TaxiConnectionListener implements ConnectionListener {
  private Timer tExit;
  private String username;
  private String password;
  private int logintime = 2000;

  @Override
  public void connectionClosed() {

  Log.i("TaxiConnectionListener", "連接關閉");  
  // 關閉連接   
  XmppConnection.getInstance().closeConnection();  
  // 重连服务器   
  tExit = new Timer();  
  tExit.schedule(new timetask(), logintime);  
  

  }

  @Override
  public void connectionClosedOnError(Exception e) {

  Log.i("TaxiConnectionListener", "連接關閉異常");  
  // 判斷為帳號已被登錄   
  boolean error = e.getMessage().equals("stream:error (conflict)");  
  if (!error) {  
      // 關閉連接   
      XmppConnection.getInstance().closeConnection();  
      // 重连服务器   
      tExit = new Timer();  
      tExit.schedule(new timetask(), logintime);  
  }  
  

  }

  class timetask extends TimerTask {

  @Override  
  public void run() {  
      username = Utils.getInstance().getSharedPreferences("taxicall",  
              "account", MainActivity.context);  
      password = Utils.getInstance().getSharedPreferences("taxicall",  
              "password", MainActivity.context);  
      if (username != null && password != null) {  
          Log.i("TaxiConnectionListener", "嘗試登錄");  
          // 连接服务器   
          if (XmppConnection.getInstance().login(username, password)) {  
              Log.i("TaxiConnectionListener", "登錄成功");  
          } else {  
              Log.i("TaxiConnectionListener", "重新登錄");  
              tExit.schedule(new timetask(), logintime);  
          }  
      }  
  }  
  

  }

  @Override
  public void reconnectingIn(int arg0) {
  }

  @Override
  public void reconnectionFailed(Exception arg0) {
  }

  @Override
  public void reconnectionSuccessful() {
  }

}

package com.techrare.listener;

import java.util.Timer;
import java.util.TimerTask;

import org.jivesoftware.smack.ConnectionListener;

import android.util.Log;

import com.techrare.taxicall.MainActivity;
import com.techrare.utils.Utils;
import com.techrare.utils.XmppConnection;

/**

• 连接监听类

• @author Administrator

• */
  public class TaxiConnectionListener implements ConnectionListener {
  private Timer tExit;
  private String username;
  private String password;
  private int logintime = 2000;

  @Override
  public void connectionClosed() {

  Log.i("TaxiConnectionListener", "連接關閉");
  // 關閉連接
  XmppConnection.getInstance().closeConnection();
  // 重连服务器
  tExit = new Timer();
  tExit.schedule(new timetask(), logintime);
  

  }

  @Override
  public void connectionClosedOnError(Exception e) {

  Log.i("TaxiConnectionListener", "連接關閉異常");
  // 判斷為帳號已被登錄
  boolean error = e.getMessage().equals("stream:error (conflict)");
  if (!error) {
      // 關閉連接
      XmppConnection.getInstance().closeConnection();
      // 重连服务器
      tExit = new Timer();
      tExit.schedule(new timetask(), logintime);
  }
  

  }

  class timetask extends TimerTask {

  @Override
  public void run() {
      username = Utils.getInstance().getSharedPreferences("taxicall",
              "account", MainActivity.context);
      password = Utils.getInstance().getSharedPreferences("taxicall",
              "password", MainActivity.context);
      if (username != null && password != null) {
          Log.i("TaxiConnectionListener", "嘗試登錄");
          // 连接服务器
          if (XmppConnection.getInstance().login(username, password)) {
              Log.i("TaxiConnectionListener", "登錄成功");
          } else {
              Log.i("TaxiConnectionListener", "重新登錄");
              tExit.schedule(new timetask(), logintime);
          }
      }
  }
  

  }

  @Override
  public void reconnectingIn(int arg0) {
  }

  @Override
  public void reconnectionFailed(Exception arg0) {
  }

  @Override
  public void reconnectionSuccessful() {
  }

}

其次就是给连接设置监听器了，最好放在登录方法里，关闭连接方法里移除监听

[java] view plaincopyprint?
// 添加連接監聽
TaxiConnectionListener connectionListener = new TaxiConnectionListener();
getConnection().addConnectionListener(connectionListener);

// 添加連接監聽
TaxiConnectionListener connectionListener = new TaxiConnectionListener();
getConnection().addConnectionListener(connectionListener);[java] view plaincopyprint?
connection.removeConnectionListener(connectionListener);

connection.removeConnectionListener(connectionListener);