Android apps浅析02-Android IM：一个类似手机QQ的即时通讯开源实现

Android apps浅析02-Android IM：一个类似手机QQ的即时通讯开源实现

这是Android上的一个简单的IM应用程序运行时，应用程序发出HTTP请求到服务器，在PHP和MySQL，验证，注册和得到其他朋友的状态和数据来实现，那么它与其他设备的其他应用程序通过通信套接字接口。

1. 数据库只要2个表：朋友表和用户表：

CREATE TABLE  `friends` (
  `Id` int(10) unsigned NOT NULL auto_increment,
  `providerId` int(10) unsigned NOT NULL default ‘0‘,
  `requestId` int(10) unsigned NOT NULL default ‘0‘,
  `status` binary(1) NOT NULL default ‘0‘,
  PRIMARY KEY  (`Id`),
  UNIQUE KEY `Index_3` (`providerId`,`requestId`),
  KEY `Index_2` (`providerId`,`requestId`,`status`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT=‘providerId is the Id of the users who wish to be friend with‘;

CREATE TABLE  `users` (
  `Id` int(10) unsigned NOT NULL auto_increment,
  `username` varchar(45) NOT NULL default ‘‘,
  `password` varchar(32) NOT NULL default ‘‘,
  `email` varchar(45) NOT NULL default ‘‘,
  `date` datetime NOT NULL default ‘0000-00-00 00:00:00‘,
  `status` tinyint(3) unsigned NOT NULL default ‘0‘,
  `authenticationTime` datetime NOT NULL default ‘0000-00-00 00:00:00‘,
  `userKey` varchar(32) NOT NULL default ‘‘,
  `IP` varchar(45) NOT NULL default ‘‘,
  `port` int(10) unsigned NOT NULL default ‘0‘,
  PRIMARY KEY  (`Id`),
  UNIQUE KEY `Index_2` (`username`),
  KEY `Index_3` (`authenticationTime`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2. 核心代码是发送Http request和Socket：

 public String sendHttpRequest(String params)

        {               

                URL url;

                String result = new String();

                try 

                {

                        url = new URL(AUTHENTICATION_SERVER_ADDRESS);

                        HttpURLConnection connection;

                        connection = (HttpURLConnection) url.openConnection();

                        connection.setDoOutput(true);

                        PrintWriter out = new PrintWriter(connection.getOutputStream());

                        out.println(params);

                        out.close();

                        BufferedReader in = new BufferedReader(

                                        new InputStreamReader(

                                                        connection.getInputStream()));

                        String inputLine;

                        while ((inputLine = in.readLine()) != null) {

                                result = result.concat(inputLine);                              

                        }

                        in.close();                     

                } 

                catch (MalformedURLException e) {

                        e.printStackTrace();

                } 

                catch (IOException e) {

                        e.printStackTrace();

                }                       

                if (result.length() == 0) {

                        result = HTTP_REQUEST_FAILED;

                }

                return result;

        }

        public boolean sendMessage(String message, String ip, int port) 

        {

                try {

                        String[] str = ip.split("\\.");

                        byte[] IP = new byte[str.length];

                        for (int i = 0; i < str.length; i++) {

                                IP[i] = (byte) Integer.parseInt(str[i]);                                

                        }

                        Socket socket = getSocket(InetAddress.getByAddress(IP), port);

                        if (socket == null) {

                                return false;

                        }

                        PrintWriter out = null;

                        out = new PrintWriter(socket.getOutputStream(), true);

                        out.println(message);

                } catch (UnknownHostException e) {                      

                        return false;

                        //e.printStackTrace();

                } catch (IOException e) {

                        return false;                   

                        //e.printStackTrace();

                }

                return true;            

        }

3.其他信息：

使用http request和socket实现的Android即时通讯应用
原始源码：https://code.google.com/p/simple-android-instant-messaging-application/
最新源码：https://github.com/Pirngruber/AndroidIM
源码下载：http://download.csdn.net/user/yangzhenping
初始作者提供的源码下载：http://download.csdn.net/detail/yangzhenping/8397989