```
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;
}
```
