//loading all invitationa - memers with status INVITED
    class LoadAllInvitations extends AsyncTask<String, String, String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(UserActivity.this);
            pDialog.setMessage("Loading invitations. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        protected String doInBackground(String... args) {

            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair(TAG_USERID, String.valueOf(userID)));

            //getting JSON string from URL
            JSONObject json = jParser.makeHttpRequest(url_procedure_select_invitations_groups_with_names, "POST", params);
            Log.d("All Invitaions: ", json.toString());

            try {
                // Checking for SUCCESS TAG
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {
                    // users found Getting Array of membership
                    memberships = json.getJSONArray(TAG_MEMBERSHIP);

                    // looping through memberships with invitations status
                    for (int i = 0; i < memberships.length(); i++) {

                        JSONObject c = memberships.getJSONObject(i);
                        String groupID = c.getString(TAG_GROUPID);
                        String groupName = c.getString(TAG_GROUPNAME);

                        HashMap<String, String> map = new HashMap<String, String>();
                        map.put(TAG_GROUPID, groupID);
                        map.put(TAG_GROUPNAME, groupName);

                        invitationsList.add(map);
                    }
                } else
                    {
                    Toast.makeText(getBaseContext(), "Error, can't load invitations", Toast.LENGTH_LONG).show();
                }

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

            return null;
        }

        protected void onPostExecute(String file_url) {
            pDialog.dismiss();
        }
    }