private class JSONTask extends AsyncTask<String, Void, JSONObject>{
        protected JSONObject doInBackground(String... params) {
            JSONObject json_data=null;
            try{
                HttpClient httpclient = new DefaultHttpClient();
                for(int i=0;i<counter;i++){
                    Log.e("log_tag", myid.get(i));
                    String s=myid.get(i);
                    HttpPost httppost = new HttpPost("http://photogiuseppe.altervista.org/mydogs.php?id="+s);
                    HttpResponse response = httpclient.execute(httppost);
                    HttpEntity entity = response.getEntity();
                    String body = EntityUtils.toString(entity);
                    JSONObject result = new JSONArray(body).getJSONObject(0);
                    is[i]=entity.getContent();
                }//fine ciclo for
            }//chiusura try
            catch(Exception e){
                Log.e("log_tag", "Errore in http connection"+e.toString());
                e.printStackTrace();
            }

                return json_data;
            }//chiusura doInBackground

        protected void postExecute(JSONObject json_data){}

        protected void onPostExecute(JSONObject json_data) {
            postExecute(json_data);
        }

    }//chiusura JSONTask