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;
}
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
