android 获取MAC

```

public class WlanMacAddressGetter {

private static final StringTAG = WlanMacAddressGetter.class.getName();

    public static StringgetWlanMacAddress() {

try {

Enumeration networkInterfaces = NetworkInterface.getNetworkInterfaces();

            while (networkInterfaces.hasMoreElements()) {

NetworkInterface networkInterface = networkInterfaces.nextElement();

                if (networkInterface.getName().equals("wlan0")) {

StringBuilder mac =new StringBuilder();

                    byte[] hardwareAddress = networkInterface.getHardwareAddress();

                    String hex = Integer.toHexString(hardwareAddress[0] &0xff);

                    if (hex.length() ==1) {

mac.append('0');

                    }

mac.append(hex);

                    for (int i =1; i < hardwareAddress.length; ++i) {

mac.append(':');

                        hex = Integer.toHexString(hardwareAddress[i] &0xff);

                        if (hex.length() ==1) {

mac.append('0');

                        }

mac.append(hex);

                    }

return mac.toString();

                }

}

}catch (SocketException ex) {

Log.e(TAG, null, ex);

        }

return null;

    }

```