Android获取本地IP地址，Ipv4地址检查，Ipv6地址检查

	
	/**
	 * 获取本地IP地址
	 * @author YOLANDA
	 * @return
	 */
	public static String getLocalIPAddress() {
		String ipAddress = "";
		try {
			Enumeration<NetworkInterface> netfaces = NetworkInterface.getNetworkInterfaces();
			// 遍历所用的网络接口
			while (netfaces.hasMoreElements()) {
				NetworkInterface nif = netfaces.nextElement();// 得到每一个网络接口绑定的地址
				Enumeration<InetAddress> inetAddresses = nif.getInetAddresses();
				// 遍历每一个接口绑定的所有ip
				while (inetAddresses.hasMoreElements()) {
					InetAddress ip = inetAddresses.nextElement();
					if (!ip.isLoopbackAddress() && isIPv4Address(ip.getHostAddress())) {
						ipAddress = ip.getHostAddress();
					}
				}
			}
		} catch (SocketException e) {
			e.printStackTrace();
		}
		return ipAddress;
	}

/*这里要加上一点说明，因为在21开始，HTTPClient被抛弃了，Google推荐使用URLConnect，这里的Ipv4也被抛弃了，为了兼容以后的版本，我把HTTPClient的一些源码直接拿到项目中来用，所以这里出现了Ipv4的检查的源码*/

	
	/**
	 * Ipv4地址检查
	 */
	private static final Pattern IPV4_PATTERN = Pattern.compile("^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$");
	/**
	 * 检查是否是有效的IPV4地址
	 * @param input the address string to check for validity
	 * @return true if the input parameter is a valid IPv4 address
	 */
	public static boolean isIPv4Address(final String input) {
		return IPV4_PATTERN.matcher(input).matches();
	}

	/*===========以下是IPv6的检查，暂时用不到==========*/
	
	/*//未压缩过的IPv6地址检查
	private static final Pattern IPV6_STD_PATTERN = Pattern.compile("^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");

	//检查参数是否有效的标准(未压缩的)IPv6地址
	public static boolean isIPv6StdAddress(final String input) {
		return IPV6_STD_PATTERN.matcher(input).matches();
	}


	//压缩过的IPv6地址检查
	private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = Pattern.compile(
			"^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" + // 0-6 hex fields
			"::" +
			"(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$"); // 0-6 hex fields
	//检查参数是否有效压缩IPv6地址
	public static boolean isIPv6HexCompressedAddress(final String input) {
		int colonCount = 0;
		for(int i = 0; i < input.length(); i++) {
			if (input.charAt(i) == ':') {
				colonCount++;
			}
		}
		return  colonCount <= 7 && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
	}

	//检查是否是压缩或者未压缩过的IPV6地址
	public static boolean isIPv6Address(final String input) {
		return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
	}*/