Android Asmack登录

	private Integer login(){
		
		String name = Util.readPre(context, app.getLoginname(), GoLoveApp.USERNAME, "");
		
		String pwd = Util.readPre(context, app.getLoginname(), GoLoveApp.PASSWORD, "");
		try {
			XMPPConnection connection  = XmppConnectionManager.getInstance().getConnection();
			connection.connect();
			connection.login(name, Util.MD5(pwd));
			//处理离线消息
			OfflineMsgManager.getInstance(context).getOfflineMsg(connection);
			connection.sendPacket(new Presence(Presence.Type.available));
			return GoLoveApp.LOGIN_SECCESS;
		} catch (Exception e) {
			if(e instanceof XMPPException){
				XMPPException xe = (XMPPException) e;
				final XMPPError error = xe.getXMPPError();
				int errorCode = 0;
				if(error!=null){
					errorCode = error.getCode();
				}
				if(errorCode==401 || errorCode==403){
					return GoLoveApp.LOGIN_ERROR_ACCOUNT_PASS;
				}else{
					return GoLoveApp.SERVER_UNAVAILABLE;
				}
				
			}else{
				return GoLoveApp.LOGIN_ERROR;
			}
		}
	}