android wifi의 ip, netmask, gateway, dns 정보 가져오기

// wifi 가 연결 됬는지 확인 하는것 
        ConnectivityManager manager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE); 
        boolean wificon = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnected(); 

          if(wificon == false){ 
              return;  // 연결이 됬는지 확인 
          } 
            // wifi 정보 가져오기 
            WifiManager wifimanager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE); 

            DhcpInfo dhcpInfo = wifimanager.getDhcpInfo(); 
            int wIp = dhcpInfo.ipAddress; 
            int wNetmask = dhcpInfo.netmask; 
            int wGateway = dhcpInfo.gateway; 
            int wDns1 = dhcpInfo.dns1; 

            String ip = String.format("%d.%d.%d.%d", (wIp & 0xff), (wIp >> 8 & 0xff), (wIp >> 16 & 0xff), (wIp >> 24 & 0xff)); 
            String subnet = String.format("%d.%d.%d.%d", (wNetmask & 0xff), (wNetmask >> 8 & 0xff), (wNetmask >> 16 & 0xff), (wNetmask >> 24 & 0xff)); 
            String gateway = String.format("%d.%d.%d.%d", (wGateway & 0xff), (wGateway >> 8 & 0xff), (wGateway >> 16 & 0xff), (wGateway >> 24 & 0xff)); 
            String dns = String.format("%d.%d.%d.%d", (wDns1 & 0xff), (wDns1 >> 8 & 0xff), (wDns1 >> 16 & 0xff), (wDns1 >> 24 & 0xff));