Get Public IP

    public static class GetPublicIP extends AsyncTask<String, String, String> {

        @Override
        protected String doInBackground(String... strings) {
            String publicIP = "";
            try {
                java.util.Scanner s = new java.util.Scanner(new java.net.URL("https://api.ipify.org")
                        .openStream(), "UTF-8")
                        .useDelimiter("\\A");
                publicIP = s.next();
                Log.d("TAG", "My current IP address is " + publicIP);
            } catch (java.io.IOException e) {
                e.printStackTrace();
            }

            return publicIP;
        }

        @Override
        protected void onPostExecute(String publicIp) {
            super.onPostExecute(publicIp);
            Log.d("TAG", publicIp + "");
            //Here 'publicIp' is your desire public IP
        }
    }