android即时通讯技术基于XMPP协议asmack聊天功能实战

XMPP协议简介

XMPP协议（Extensible Messaging and PresenceProtocol，可扩展消息处理现场协议）是一种基于XML的协议，目的是为了解决及时通信标准而提出来的，最早是在Jabber上实现的。它继承了在XML环境中灵活的发展性。因此，基于XMPP的应用具有超强的可扩展性。并且XML很易穿过防火墙，所以用XMPP构建的应用不易受到防火墙的阻碍。利用XMPP作为通用的传输机制，不同组织内的不同应用都可以进行有效的通信。

这篇文章有基本的介绍，http://blog.csdn.net/xutaozero21/article/details/4873439

IM

Instant Messenger，及时通信软件，就是大家使用的QQ、MSN Messenger和Gtalk等等。其中Gtalk 就是基于XMPP 协议的一个实现，其他的则不是。当前IM 几乎作为每个上网者必然使用的工具，在国外的大型企业中有一些企业级的IM应用，但是其商业价值还没完全发挥出来。设想既然XMPP 协议是一个公开的协议，那么每个企业都可以利用它来开发适合本身企业工作，提高自身生产效率的IM；甚至，你还可以在网络游戏中集成这种通信软件，不但让你可以边游戏边聊天，也可以开发出适合游戏本身的IM 应用，比如说一些游戏关键场景提醒功能，团队语音交流等等都可以基于IM来实现。

 

本文主要讲解在android使用xmpp协议进行即时通信，所涉及3个主要的东西，它们是openfire、smack和spark，这个三个东东结合起来就是完整的xmpp IM实现，这里简单介绍一下这3个东东在下文的作用：

openfire主要是作为服务器，负责管理客户端的通信连接，以及提供客户端一些通信信息和连接信息。

Smack主要是xmpp协议的实现，提供了一套很好的api，所以下面操作xmpp都是通过使用smack的api来实现，当然因为是在android里，所以使用的是asmack这个包，里面方法跟smack包差不多。

Spark 是IM客户端的实现，其实就是使用了smack 的api实现的。

 

下图展示了三者之间的关系：（很明显这个图是偷别人的，具体是哪里我忘了，因为资料都是复制到文档后慢慢研究看的）

从图上可以了解到，client 端和server端都可以通过插件的方式来进行扩展，smack是二者传递数据的媒介。

 

配置openfire服务器

具体步骤请移步：http://javatech.blog.163.com/blog/static/1766322992010111725339587/

配置成功如果以后ip地址变了，那肯定又是开不了，解决办法请移步：http://blog.csdn.net/HappySheepherder/article/details/4707124

配置成功后，在服务器创建一个简单的用户来测试，然后安装spark，设置好服务器的ip与端口，使用刚才创建的用户登录，登录OK说明服务器成功搭建。

Android IM功能（因为是测试demo，因此界面超级简陋，代码都是给出重要的一部分，剩余的可以在最后下面项目查看）

 

配置要求

android 2.2、 asmack-jse.jar、myeclipse

连接服务器

在打开软件后会开始初始化，完成与openfire服务器的连接，设置一些配置

static {
        XMPPConnection.DEBUG_ENABLED = true;
        final ConnectionConfiguration connectionConfig = new ConnectionConfiguration(
                host, 5222, "");
        // Google talk
        // ConnectionConfiguration connectionConfig = new
        // ConnectionConfiguration(
        // "talk.google.com", 5222, "gmail.com");{
        XMPPConnection.DEBUG_ENABLED = true;
        final ConnectionConfiguration connectionConfig = new ConnectionConfiguration(
                host, 5222, "");
        // Google talk
        // ConnectionConfiguration connectionConfig = new
        // ConnectionConfiguration(
        // "talk.google.com", 5222, "gmail.com");

        // connectionConfig.setSASLAuthenticationEnabled(false);
        ActivityMain.connection = new XMPPConnection(connectionConfig);

        ActivityMain.connection.DEBUG_ENABLED = true;

        ProviderManager pm = ProviderManager.getInstance();
        configure(pm);
    }

ActivityMain.connection = new XMPPConnection(connectionConfig);

        ActivityMain.connection.DEBUG_ENABLED = true;

        ProviderManager pm = ProviderManager.getInstance();
        configure(pm);
    }

注册模块

注册有两种方法：一种是用createAccount ，不过我测试了一下发现不能创建用户，具体原因不详，下面介绍第二种。

如上图：注册成功后服务器将多了ggg用户。

具体实现如下：

Registration reg = new Registration();
                reg.setType(IQ.Type.SET);
                reg.setTo(ConnectionSingleton.getInstance().getServiceName());
                reg.setUsername(username.getText().toString());
                reg.setPassword(password.getText().toString());
                reg.addAttribute("android", "geolo_createUser_android");
                System.out.println("reg:" + reg);
                PacketFilter filter = new AndFilter(new PacketIDFilter(reg
                        .getPacketID()), new PacketTypeFilter(IQ.class));
                PacketCollector collector = ConnectionSingleton.getInstance()
                        .createPacketCollector(filter);
                ConnectionSingleton.getInstance().sendPacket(reg);
                
                result = (IQ) collector.nextResult(SmackConfiguration
                        .getPacketReplyTimeout());
                // Stop queuing results
                collector.cancel();
                 if (result == null) {
                    Toast.makeText(getApplicationContext(), "服,
                            Toast.LENGTH_SHORT).show();
                } else if (result.getType() == IQ.Type.ERROR) {
                    if (result.getError().toString().equalsIgnoreCase(
                            "conflict(409)")) {
                        Toast.makeText(getApplicationContext(), "这,
                                Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(getApplicationContext(), "注,
                                Toast.LENGTH_SHORT).show();
                    }
                } else if (result.getType() == IQ.Type.RESULT) {
                    Toast.makeText(getApplicationContext(), "恭,
                            Toast.LENGTH_SHORT).show();
                }new Registration();
                reg.setType(IQ.Type.SET);
                reg.setTo(ConnectionSingleton.getInstance().getServiceName());
                reg.setUsername(username.getText().toString());
                reg.setPassword(password.getText().toString());
                reg.addAttribute("android", "geolo_createUser_android");
                System.out.println("reg:" + reg);
                PacketFilter filter = new AndFilter(new PacketIDFilter(reg
                        .getPacketID()), new PacketTypeFilter(IQ.class));
                PacketCollector collector = ConnectionSingleton.getInstance()
                        .createPacketCollector(filter);
                ConnectionSingleton.getInstance().sendPacket(reg);
                
                result = (IQ) collector.nextResult(SmackConfiguration
                        .getPacketReplyTimeout());
                // Stop queuing results
                collector.cancel();
                 if (result == null) {
                    Toast.makeText(getApplicationContext(), "服,
                            Toast.LENGTH_SHORT).show();
                } else if (result.getType() == IQ.Type.ERROR) {
                    if (result.getError().toString().equalsIgnoreCase(
                            "conflict(409)")) {
                        Toast.makeText(getApplicationContext(), "这,
                                Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(getApplicationContext(), "注,
                                Toast.LENGTH_SHORT).show();
                    }
                } else if (result.getType() == IQ.Type.RESULT) {
                    Toast.makeText(getApplicationContext(), "恭,
                            Toast.LENGTH_SHORT).show();
                }

使用注册类，设置好注册的用户名密码和一些属性字段，直接设置包过滤，根据这个过滤创建一个结果集合，发送注册信息包，等待获取结果，剩余就是判断结果内容.

 

登录模块

登录比较简单

ConnectionSingleton.getInstance().connect();// connect
String account = etUsername.getText().toString();
String password = etPassword.getText().toString();
// 保存用户和密码// connect
String account = etUsername.getText().toString();
String password = etPassword.getText().toString();
// 保存用户和密码

ActivityLogin.util.saveString(ACCOUNT_KEY, account);
ActivityLogin.util.saveString(PASSWORD_KEY, password);
ConnectionSingleton.getInstance().login(account, password);// login

// login success 
System.out.println("login success");
ActivityLogin.mCurrentAccount = account;
System.out.println(ConnectionSingleton.getInstance()
        .getUser());
// 登录成功后发现在线状态util.saveString(ACCOUNT_KEY, account);
ActivityLogin.util.saveString(PASSWORD_KEY, password);
ConnectionSingleton.getInstance().login(account, password);// login

// login success 
System.out.println("login success");
ActivityLogin.mCurrentAccount = account;
System.out.println(ConnectionSingleton.getInstance()
        .getUser());
// 登录成功后发现在线状态

Presence presence = new Presence(Presence.Type.available);
ConnectionSingleton.getInstance().sendPacket(presence);

// 开始主界面new Presence(Presence.Type.available);
ConnectionSingleton.getInstance().sendPacket(presence);

// 开始主界面

Intent intent = new Intent(ActivityLogin.this,
        ActivityMain.class);
startActivity(intent);
new Intent(ActivityLogin.this,
        ActivityMain.class);
startActivity(intent);

 

获取联系人模块（ActivityMain 主界面）

获取联系人并将相关信息保存到一个list数组里，最后通知listview更新界面

roster = ActivityMain.connection.getRoster();
= ActivityMain.connection.getRoster();

public void updateRoster() {
        Collection<RosterEntry> entries = roster.getEntries();
        for (RosterEntry entry : entries) {
            System.out.print(entry.getName() + " - " + entry.getUser() + " - "
                    + entry.getType() + " - " + entry.getGroups().size());
            Presence presence = roster.getPresence(entry.getUser());
            System.out.println(" - " + presence.getStatus() + " - "
                    + presence.getFrom());
            User user = new User();
            user.setName(entry.getName());
            user.setUser(entry.getUser());
            user.setType(entry.getType());
            user.setSize(entry.getGroups().size());
            user.setStatus(presence.getStatus());
            user.setFrom(presence.getFrom());
            userinfos.add(user);
        }
        rosterAdapter.notifyDataSetChanged();
    }updateRoster() {
        Collection<RosterEntry> entries = roster.getEntries();
        for (RosterEntry entry : entries) {
            System.out.print(entry.getName() + " - " + entry.getUser() + " - "
                    + entry.getType() + " - " + entry.getGroups().size());
            Presence presence = roster.getPresence(entry.getUser());
            System.out.println(" - " + presence.getStatus() + " - "
                    + presence.getFrom());
            User user = new User();
            user.setName(entry.getName());
            user.setUser(entry.getUser());
            user.setType(entry.getType());
            user.setSize(entry.getGroups().size());
            user.setStatus(presence.getStatus());
            user.setFrom(presence.getFrom());
            userinfos.add(user);
        }
        rosterAdapter.notifyDataSetChanged();
    }

单人聊天模块

第一次修改：

在主界面点击选择一个用户，进入聊天Activity，ActivityChat先获取传过来的用户，创建聊天类并对该用户设置消息监听

ChatManager chatmanager = ConnectionSingleton.getInstance()
                .getChatManager();

        // get user
        Intent intent = getIntent();
        String user = intent.getStringExtra("user");
        System.out.println("user:" + user);
        // new a session
        newChat = chatmanager.createChat(user, null);
        // 监听聊天消息// get user
        Intent intent = getIntent();
        String user = intent.getStringExtra("user");
        System.out.println("user:" + user);
        // new a session
        newChat = chatmanager.createChat(user, null);
        // 监听聊天消息

        chatmanager.addChatListener(new ChatManagerListenerEx());

        // send message
        try {
            newChat.sendMessage("im bird man");

        } catch (XMPPException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }new ChatManagerListenerEx());

        // send message
        try {
            newChat.sendMessage("im bird man");

        } catch (XMPPException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

监听类

public class ChatManagerListenerEx implements ChatManagerListener {

        @Override
        public void chatCreated(Chat chat, boolean arg1) {
            // TODO Auto-generated method stub
            chat.addMessageListener(ml);
        }

    }

    public class MessageListenerEx implements MessageListener {

        @Override
        public void processMessage(Chat arg0, Message message) {
            String result = message.getFrom() + ":" + message.getBody();
            System.out.println(result);
            android.os.Message msg = new android.os.Message();
            msg.what = 0;
            Bundle bd = new Bundle();
            bd.putString("msg", result);
            msg.setData(bd);
            handler.sendMessage(msg);

        }
    }
ChatManagerListenerEx implements ChatManagerListener {

        @Override
        public void chatCreated(Chat chat, boolean arg1) {
            // TODO Auto-generated method stub
            chat.addMessageListener(ml);
        }

    }

    public class MessageListenerEx implements MessageListener {

        @Override
        public void processMessage(Chat arg0, Message message) {
            String result = message.getFrom() + ":" + message.getBody();
            System.out.println(result);
            android.os.Message msg = new android.os.Message();
            msg.what = 0;
            Bundle bd = new Bundle();
            bd.putString("msg", result);
            msg.setData(bd);
            handler.sendMessage(msg);

        }
    }

 

所获取到的消息都是通过handler来更新UI

public Handler handler = new Handler() {

        @Override
        public void handleMessage(android.os.Message msg) {

            switch (msg.what) {
            case 0: {
                String result = msg.getData().getString("msg");
                record.setText(record.getText() + "\n" + result);
            }
                break;
            default:
                break;
            }
        }
    };Handler handler = new Handler() {

        @Override
        public void handleMessage(android.os.Message msg) {

            switch (msg.what) {
            case 0: {
                String result = msg.getData().getString("msg");
                record.setText(record.getText() + "\n" + result);
            }
                break;
            default:
                break;
            }
        }
    };

 

aaa跟bbb 的聊天

第二次修改:

第一次的测试，发现如果多个人之间都成为好友，那么他们之间的聊天就出现了接收不到的信息，当然在跟spark测试时，spark可以收到android端的信息，不过android客户端是收到这个信息，不过却没有显示出来，具体原因还不太清楚。因此在第二次修改我改成监听所有聊天信息包，然后再分析包的归属，分发到对应的聊天窗口。

 

这里就是监听到包后打印的消息，打印出了jid和消息内容

public class XmppMessageManager implements ChatManagerListener {
        private XMPPConnection _connection;
        private ChatManager manager = null;

        public void initialize(XMPPConnection connection) {
            _connection = connection;
            manager = _connection.getChatManager();
            manager.addChatListener(this);
        }

        @Override
        public void chatCreated(Chat chat, boolean arg1) {
            // TODO Auto-generated method stub
            chat.addMessageListener(new MessageListener() {
                public void processMessage(Chat newchat, Message message) {
                    // 若是聊天窗口存在，将消息转往目前窗口
                    // 若窗口不存在，创建新的窗口
                    System.out
                            .println(message.getFrom() + ":" + message.getBody());

                    
                    if (!ActivityMain.chats.containsKey(message.getFrom())) {
                        ActivityMain.chats.put(message.getFrom(), newchat);
                    } else {

                    }

                }
            });
        }
    }XmppMessageManager implements ChatManagerListener {
        private XMPPConnection _connection;
        private ChatManager manager = null;

        public void initialize(XMPPConnection connection) {
            _connection = connection;
            manager = _connection.getChatManager();
            manager.addChatListener(this);
        }

        @Override
        public void chatCreated(Chat chat, boolean arg1) {
            // TODO Auto-generated method stub
            chat.addMessageListener(new MessageListener() {
                public void processMessage(Chat newchat, Message message) {
                    // 若是聊天窗口存在，将消息转往目前窗口
                    // 若窗口不存在，创建新的窗口
                    System.out
                            .println(message.getFrom() + ":" + message.getBody());

                    
                    if (!ActivityMain.chats.containsKey(message.getFrom())) {
                        ActivityMain.chats.put(message.getFrom(), newchat);
                    } else {

                    }

                }
            });
        }
    }

主要就是重写了ChatManagerListener类的监听，分发处理暂时没有想好怎么写。接着在后台启动service就可以开始监听，行了第一次修改那些可以去掉了^0^。

 

多人聊天模块

也是在主界面的菜单进入ActivityMultiChat,该界面显示所创建的房间，点击就跳转到ActivityMultiRoom 。

获取所有房间比较简单，只需执行下面这段代码

hostrooms = MultiUserChat.getHostedRooms(ActivityMain.connection,

"conference.zhanghaitao-pc");

跳转到后获取要加入的房间的jid，并创建监听。

jid = getIntent().getStringExtra("jid");

 

<span style="color:#00ff00"><span style="color:#3f7f5f">   //</span>后面服务名称必需是创建房间的那个服务</span>

   String multiUserRoom = jid;
    try {
        muc = new MultiUserChat(ActivityMain.connection, multiUserRoom);
        // 创建聊天室,进入房间后的nicknametry {
        muc = new MultiUserChat(ActivityMain.connection, multiUserRoom);
        // 创建聊天室,进入房间后的nickname

        muc.join(ActivityLogin.mCurrentAccount);

        Log.v(TAG, "join success");

    } catch (XMPPException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    ChatPacketListener chatListener = new ChatPacketListener(muc);
    muc.addMessageListener(chatListener);mCurrentAccount);

        Log.v(TAG, "join success");

    } catch (XMPPException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    ChatPacketListener chatListener = new ChatPacketListener(muc);
    muc.addMessageListener(chatListener);

 

监听大概的流程跟单人聊天差不多，都是handler来操作。不过多人聊天是重写了PacketListener。具体如下（不过该方法是监听房间的信息，也就是说显示的是以房间为名字的消息）：

class ChatPacketListener implements PacketListener {
        private String _number;
        private Date _lastDate;
        private MultiUserChat _muc;
        private String _roomName;

        public ChatPacketListener(MultiUserChat muc) {
            _number = "0";
            _lastDate = new Date(0);
            _muc = muc;
            _roomName = muc.getRoom();
        }

        @Override
        public void processPacket(Packet packet) {
            Message message = (Message) packet;
            String from = message.getFrom();

            if (message.getBody() != null) {
                DelayInformation inf = (DelayInformation) message.getExtension(
                        "x", "jabber:x:delay");
                Date sentDate;
                if (inf != null) {
                    sentDate = inf.getStamp();
                } else {
                    sentDate = new Date();
                }

                Log.w(TAG, "Receive old message: date="
                        + sentDate.toLocaleString() + " ; message="
                        + message.getBody());

                android.os.Message msg = new android.os.Message();
                msg.what = RECEIVE;
                Bundle bd = new Bundle();
                bd.putString("from", from);
                bd.putString("body", message.getBody());
                msg.setData(bd);
                handler.sendMessage(msg);
            }
        }
    }ChatPacketListener implements PacketListener {
        private String _number;
        private Date _lastDate;
        private MultiUserChat _muc;
        private String _roomName;

        public ChatPacketListener(MultiUserChat muc) {
            _number = "0";
            _lastDate = new Date(0);
            _muc = muc;
            _roomName = muc.getRoom();
        }

        @Override
        public void processPacket(Packet packet) {
            Message message = (Message) packet;
            String from = message.getFrom();

            if (message.getBody() != null) {
                DelayInformation inf = (DelayInformation) message.getExtension(
                        "x", "jabber:x:delay");
                Date sentDate;
                if (inf != null) {
                    sentDate = inf.getStamp();
                } else {
                    sentDate = new Date();
                }

                Log.w(TAG, "Receive old message: date="
                        + sentDate.toLocaleString() + " ; message="
                        + message.getBody());

                android.os.Message msg = new android.os.Message();
                msg.what = RECEIVE;
                Bundle bd = new Bundle();
                bd.putString("from", from);
                bd.putString("body", message.getBody());
                msg.setData(bd);
                handler.sendMessage(msg);
            }
        }
    }

 

下载模块

在主界面对着用户名长按，进入下载activity。进入activityFileTransfer，点击传输按钮即可将文件传输给之前选择的用户，当然这里做得比较简单，并没有拒绝功能，一旦发现有文件就接受。

FileTransferManager transfer = new FileTransferManager(
                        ActivityMain.connection);
                String destination = user;
                OutgoingFileTransfer out = transfer
                        .createOutgoingFileTransfer(destination + "/Smack");
new FileTransferManager(
                        ActivityMain.connection);
                String destination = user;
                OutgoingFileTransfer out = transfer
                        .createOutgoingFileTransfer(destination + "/Smack");

那用户是如何监听到有文件并且接受呢？在进入主界面的时候就已经开始了一个service（fileListenerService），该服务创建文件的监听类（XmppFileManager）,监听类主要继承FileTransferListener 重写里面的fileTransferRequest方法。

File saveTo;
        // set answerTo for replies and send()
        answerTo = request.getRequestor();
        if (!Environment.MEDIA_MOUNTED.equals(Environment
                .getExternalStorageState())) {
            send("External Media not mounted read/write");
            return;
        } else if (!landingDir.isDirectory()) {
            send("The directory " + landingDir.getAbsolutePath()
                    + " is not a directory");
            return;
        }
        saveTo = new File(landingDir, request.getFileName());
        if (saveTo.exists()) {
            send("The file " + saveTo.getAbsolutePath() + " already exists");
            // delete
            saveTo.delete();
            // return;
        }
        IncomingFileTransfer transfer = request.accept();
        send("File transfer: " + saveTo.getName() + " - "
                + request.getFileSize() / 1024 + " KB");
        try {
            transfer.recieveFile(saveTo);
            send("File transfer: " + saveTo.getName() + " - "
                    + transfer.getStatus());
            double percents = 0.0;
            while (!transfer.isDone()) {
                if (transfer.getStatus().equals(Status.in_progress)) {
                    percents = ((int) (transfer.getProgress() * 10000)) / 100.0;
                    send("File transfer: " + saveTo.getName() + " - "
                            + percents + "%");
                } else if (transfer.getStatus().equals(Status.error)) {
                    send(returnAndLogError(transfer));
                    return;
                }
                Thread.sleep(1000);
            }
            if (transfer.getStatus().equals(Status.complete)) {
                send("File transfer complete. File saved as "
                        + saveTo.getAbsolutePath());
            } else {
                send(returnAndLogError(transfer));
            }
        } catch (Exception ex) {
            String message = "Cannot receive the file because an error occured during the process."
                    + ex;
            Log.e(TAG, message, ex);
            send(message);
        }// set answerTo for replies and send()
        answerTo = request.getRequestor();
        if (!Environment.MEDIA_MOUNTED.equals(Environment
                .getExternalStorageState())) {
            send("External Media not mounted read/write");
            return;
        } else if (!landingDir.isDirectory()) {
            send("The directory " + landingDir.getAbsolutePath()
                    + " is not a directory");
            return;
        }
        saveTo = new File(landingDir, request.getFileName());
        if (saveTo.exists()) {
            send("The file " + saveTo.getAbsolutePath() + " already exists");
            // delete
            saveTo.delete();
            // return;
        }
        IncomingFileTransfer transfer = request.accept();
        send("File transfer: " + saveTo.getName() + " - "
                + request.getFileSize() / 1024 + " KB");
        try {
            transfer.recieveFile(saveTo);
            send("File transfer: " + saveTo.getName() + " - "
                    + transfer.getStatus());
            double percents = 0.0;
            while (!transfer.isDone()) {
                if (transfer.getStatus().equals(Status.in_progress)) {
                    percents = ((int) (transfer.getProgress() * 10000)) / 100.0;
                    send("File transfer: " + saveTo.getName() + " - "
                            + percents + "%");
                } else if (transfer.getStatus().equals(Status.error)) {
                    send(returnAndLogError(transfer));
                    return;
                }
                Thread.sleep(1000);
            }
            if (transfer.getStatus().equals(Status.complete)) {
                send("File transfer complete. File saved as "
                        + saveTo.getAbsolutePath());
            } else {
                send(returnAndLogError(transfer));
            }
        } catch (Exception ex) {
            String message = "Cannot receive the file because an error occured during the process."
                    + ex;
            Log.e(TAG, message, ex);
            send(message);
        }

 断线重连

try {
                    Class.forName("org.jivesoftware.smack.ReconnectionManager");
                } catch (Exception e1) {
                }  

ConnectionConfiguration configuration = new ConnectionConfiguration(
                Contents.HOST, Contents.PORT);
        configuration.setReconnectionAllowed(true);

connection.connect();
if (connection.isConnected()) {
                        
connection.addConnectionListener(connectionListener);
                        
                    }
 
 
public static ConnectionListener connectionListener = new ConnectionListener() {
 
        @Override
        public void reconnectionSuccessful() {
            Log.i("connection", "reconnectionSuccessful");
        }
 
        @Override
        public void reconnectionFailed(Exception arg0) {
            Log.i("connection", "reconnectionFailed");
        }
 
        @Override
        public void reconnectingIn(int arg0) {
            Log.i("connection", "reconnectingIn");
        }
 
        @Override
        public void connectionClosedOnError(Exception arg0) {
            Log.i("connection", "connectionClosedOnError");
            
        }

实战案例如下：

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