Android - 获取ip地址

IpUtils.java

    /*获取设备IPv4地址对应的字符串*/
    public static String getIpAddressString() {
        try {
            for (Enumeration<NetworkInterface> enNetI = NetworkInterface
                    .getNetworkInterfaces(); enNetI.hasMoreElements(); ) {
                NetworkInterface netI = enNetI.nextElement();
                for (Enumeration<InetAddress> enumIpAddr = netI
                        .getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                    InetAddress inetAddress = enumIpAddr.nextElement();
                    if (inetAddress instanceof Inet4Address && !inetAddress.isLoopbackAddress()) {
                        return inetAddress.getHostAddress();
                    }
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return "0.0.0.0";
    }
    
    /*判断字符串是否为一个合法的IPv4地址*/
    public static boolean isIPv4Address(String address) {
        String regex = "(2[5][0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})"
                + "\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})"
                + "\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})"
                + "\\.(25[0-5]|2[0-4]\\d|1\\d{2}|\\d{1,2})";
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(address);
        return m.matches();
    }

请问开源协议整数是哪种呢？