Android get local IP address, Ipv4 address check, Ipv6 address check

/**
* Get local IP address
* @author YOLANDA
* @return
*/
Public static String getLocalIPAddress() {
String ipAddress = "";
Try {
Enumeration<NetworkInterface> netfaces = NetworkInterface.getNetworkInterfaces();
/ / Traverse the network interface used
While (netfaces.hasMoreElements()) {
NetworkInterface nif = netfaces.nextElement();// Get the address bound to each network interface
Enumeration<InetAddress> inetAddresses = nif.getInetAddresses();
// traverse all ips bound to each interface
While (inetAddresses.hasMoreElements()) {
InetAddress ip = inetAddresses.nextElement();
If (!ip.isLoopbackAddress() && isIPv4Address(ip.getHostAddress())) {
ipAddress = ip.getHostAddress();
}
}
}
} catch (SocketException e) {
e.printStackTrace();
}
Return ipAddress;
}

/* here to add a little explanation, because at the beginning of 21,httpClient was abandoned,Google recommended the use of Urlconnect, where the Ipv4 is also abandoned,
in order to be compatible with later versions,I httpclient some of the source code directly to the project to use,so here appears the Ipv4 check the source */

/**
* Ipv4 address check
*/
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])$");
/**
* Check if it is a valid IPV4 address
* @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();
}

/*=========== The following is an IPv6 check, temporarily not used ==========*/

/*//Uncompressed IPv6 address check
Private static final Pattern IPV6_STD_PATTERN = Pattern.compile("^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");

/ / Check the standard (uncompressed) IPv6 address of the parameter is valid
Public static boolean isIPv6StdAddress(final String input) {
Return IPV6_STD_PATTERN.matcher(input).matches();
}


//Compressed IPv6 address check
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
/ / Check whether the parameter is valid to compress the IPv6 address
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();
}

/ / Check if the compressed or uncompressed IPV6 address
Public static boolean isIPv6Address(final String input) {
Return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
}*/ 

Android get local IP address, Ipv4 address check, Ipv6 address check