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

学习过程当中你们都碰到过链接被断开的问题给困扰吧，下面教你们如何作到链接断开后，从新链接

首先要建立链接监听器，用来监听链接状态，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()

前者为链接正常断开，后者是链接异常断开，无论是正常仍是异常，咱们都要监听到

这里写了一个定时器，两秒进行链接一次，注释写的也很清楚，不作太多介绍

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;

/**

• 链接监听类
• @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");  
            // 链接服务器   
            if (XmppConnection.getInstance().login(username, password)) {  
                Log.i("TaxiConnectionListener", "登錄成功");  
            } else {  
                Log.i("TaxiConnectionListener", "从新登錄");  
                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;

/**

• 链接监听类
• @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");
			// 链接服务器
			if (XmppConnection.getInstance().login(username, password)) {
				Log.i("TaxiConnectionListener", "登錄成功");
			} else {
				Log.i("TaxiConnectionListener", "从新登錄");
				tExit.schedule(new timetask(), logintime);
			}
		}
	}
}

@Override
public void reconnectingIn(int arg0) {
}

@Override
public void reconnectionFailed(Exception arg0) {
}

@Override
public void reconnectionSuccessful() {
}

}

其次就是给链接设置监听器了，最好放在登陆方法里，关闭链接方法里移除监听

[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);