android 获取IP

注意：下面这个方法不能在UI线程运行

private String getIP() {
    	String ipstr = "";
		try {
			Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
			InetAddress ip = null;
			while (allNetInterfaces.hasMoreElements())
			{
				NetworkInterface netInterface = (NetworkInterface) allNetInterfaces
						.nextElement();
				Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
				while (addresses.hasMoreElements()) {
					ip = (InetAddress) addresses.nextElement();
					if (ip != null && ip instanceof Inet4Address) {
						String s = ip.getHostAddress();
						if (!s.equals("127.0.0.1")) {
							ipstr = s;
							break;
						}
					}
				}
				if(ipstr.length()>0){
					break;				
				}
			}
		} catch (SocketException e) {
			e.printStackTrace();
		}
		return ipstr;
	}