protected String doInBackground(String... params) {
        String type = params[0];
        String login_url = "https://www.example.com";
        if (type.equals("login")) {
            try {
                String email = params[1];
                String password = params[2];
                URL url = new URL(login_url);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                OutputStream outputStream = httpURLConnection.getOutputStream();
                BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
                String post_data = URLEncoder.encode("username", "UTF-8") + "=" + URLEncoder.encode(email, "UTF-8") + "&"
                                 + URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode(password, "UTF-8");
                bufferedWriter.write(post_data);
                bufferedWriter.flush();
                bufferedWriter.close();
                outputStream.close();
                InputStream inputStream = httpURLConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
                while ((line = bufferedReader.readLine()) != null) {
                    result += line;
                }
                bufferedReader.close();
                inputStream.close();
                httpURLConnection.disconnect();
                JSONObject obj= null;
                try {
                    obj = new JSONObject(result);
                    String status=obj.getString("status");
                    JSONObject data_obj=obj.getJSONObject("data");
                    win_user=data_obj.getString("id");
                    name=data_obj.getString("name");
                    logo=data_obj.getString("logo");

                    return win_user;
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                return result;


            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();}
        }
        return null;
    }

    @Override
    protected void onPreExecute() {
        alertDialog = new AlertDialog.Builder(context).create();
        alertDialog.setTitle("Login Status");
    }


    @Override
    protected void onPostExecute(String result) {
        if (result == null ) {
            Toast pass = Toast.makeText(context, "Email or Password is not match!", Toast.LENGTH_SHORT);
            pass.show();
        }
        else
        {
            context.startActivity( new Intent(context,Main.class));
            Main.JSON_STRING = result;
            Main.name = name;
            Main.logo = logo;
        }

    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }
}