wlan mac地址 network interface IPv6 IPv4

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Enumeration<NetworkInterface> interfaces =  NetworkInterface.getNetworkInterfaces();
                while(interfaces.hasMoreElements()){
                    String name = interfaces.nextElement().getName();
                    NetworkInterface inter = null;
                    StringBuffer buffer = new StringBuffer();
                    if (name != null) {
                        Log.e(TAG, "interface:  " + name);
                        inter = NetworkInterface.getByName(name);
                    }
                    if(inter != null){
                        byte[] addr = inter.getHardwareAddress();
                        if(addr != null){
                            for (byte b : addr) {
                                buffer.append(String.format("%02X:", b));
                            }
                            if (buffer.length() > 0) {
                                buffer.deleteCharAt(buffer.length() - 1);
                            }
                            Log.e(TAG, name + ":  " +buffer.toString());
                        }

                    }

                }

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interface: eth0
eth0: 2E:54:E7:A7:D5:83
interface: sit0
interface: lo
interface: wlan0
wlan0: B0:F1:EC:0B:85:26

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/**
     * Returns the hardware address of the interface, if it has one, or null otherwise.
     *
     * @throws SocketException if an I/O error occurs.
     * @since 1.6
     */
    public byte[] getHardwareAddress() throws SocketException {
        try {
            // Parse colon-separated bytes with a trailing newline: "aa:bb:cc:dd:ee:ffn".
            String s = IoUtils.readFileAsString("/sys/class/net/" + name + "/address");
            byte[] result = new byte[s.length()/3];
            for (int i = 0; i < result.length; ++i) {
                result[i] = (byte) Integer.parseInt(s.substring(3*i, 3*i + 2), 16);
            }
            // We only want to return non-zero hardware addresses.
            for (int i = 0; i < result.length; ++i) {
                if (result[i] != 0) {
                    return result;
                }
            }
            return null;
        } catch (Exception ex) {
            throw rethrowAsSocketException(ex);
        }
    }

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private static String[] readIfInet6Lines() throws SocketException {
        try {
            return IoUtils.readFileAsString("/proc/net/if_inet6").split("n");
        } catch (IOException ioe) {
            throw rethrowAsSocketException(ioe);
        }
    }