public String c() {
        final WifiManager wifiManager = (WifiManager)this.getSystemService("wifi");
        WifiInfo connectionInfo;
        if (wifiManager == null) {
            connectionInfo = null;
        }
        else {
            connectionInfo = wifiManager.getConnectionInfo();
        }
        String s;
        if (connectionInfo != null) {
            s = connectionInfo.getMacAddress();
            if (s != null) {
                s = "8c0f" + s.replaceAll(":", "");
            }
        }
        else {
            s = null;
        }
        return s;
    }