class GetProductDetails extends AsyncTask<String, String, JSONObject> {

int text_size;
SharedPreferences sharedPrefs;
        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(PM_article.this);
            pDialog.setMessage("Loading product details. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();


                            // product with this pid found
                            // Edit Text
                            art_title = (TextView) findViewById(R.id.display_title);
                            art_author = (TextView) findViewById(R.id.display_author);
                            art_publishtime = (TextView) findViewById(R.id.display_date);
                            art_content = (TextView) findViewById(R.id.display_content);
                     sharedPrefs = PreferenceManager
                            .getDefaultSharedPreferences(context);
                            // display product data in TextView
                           text_size = Integer.parseInt(sharedPrefs.getString("prefFontSize", "1"));

        }

        /**
         * Getting product details in background thread
         * */

        protected JSONObject doInBackground(String... args) {
            JSONObject json ;
                    int success;
                    try {

                        List<NameValuePair> params = new ArrayList<NameValuePair>();
                        params.add(new BasicNameValuePair("id", id_pub));

                        JSONObject json = jParser.makeHttpRequest(url_load_article, "GET", params);


                    } catch (JSONException e) {
                        e.printStackTrace();
                    }



            return json;
        }
        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(JSONObject json) {
            // dismiss the dialog once got all details
                  // json success tag
                        success = json.getInt(TAG_SUCCESS);
                        if (success == 1) {
                            // successfully received product details
                            JSONArray contentObj = json
                                    .getJSONArray(TAG_PRODUCT); // JSON Array

                            // get first product object from JSON Array
                            JSONObject product = contentObj.getJSONObject(0);


                            art_title.setText(product.getString(TAG_TITLE));
                                art_title.setTextSize(TypedValue.COMPLEX_UNIT_SP, text_size+20);
                            art_author.setText(product.getString(TAG_AUTHOR));
                                art_author.setTextSize(TypedValue.COMPLEX_UNIT_SP, text_size+14);
                                      art_publishtime.setText(product.getString(TAG_PUBLISHTIME));
                                art_publishtime.setTextSize(TypedValue.COMPLEX_UNIT_SP, text_size+14);
                            art_content.setText(product.getString(TAG_CONTENT));
                                art_content.setTextSize(TypedValue.COMPLEX_UNIT_SP, text_size+18);

                        }else{
                            // product with pid not found
                        }
            pDialog.dismiss();
        }

    }