AsyncTask.java

private class GetFavoriteActivitiesAsyncTask extends AsyncTask<Void, Void, Void>
{
    List<ActivityDescription> favoriteActivityDescriptionList = new ArrayList<>();
    @Override
    protected Void doInBackground(Void... params)
    {
        HttpRequest request = HttpRequest.get(getActivity().getString(R.string.get_favorite_activities)).header("Cookie", mSession);
        if (request.ok()) {
            String response = request.body();
            try {
                JSONArray array = new JSONArray(response);
                for (int i = 0; i < array.length(); i++) {
                    JSONObject object = array.getJSONObject(i);
                    int id = object.getInt("id");
                    String name = object.getString("name");
                    String body = object.getString("body");
                    String imageURL = object.getString("image");
                    String gainStartDate = object.getString("gain_start");
                    String gainEndDate = object.getString("gain_end");
                    String exchangeStartDate = object.getString("ex_start");
                    String exchangeEndDate = object.getString("ex_end");

                    ActivityDescription activityDescription = new ActivityDescription();
                    activityDescription.setId(id);
                    activityDescription.setActivityName(name);
                    activityDescription.setActivityContent(body);
                    activityDescription.setActivityImageURL(imageURL);
                    activityDescription.setGainStartDate(gainStartDate);
                    activityDescription.setGainEndDate(gainEndDate);
                    activityDescription.setExchangeStartDate(exchangeStartDate);
                    activityDescription.setExchangeEndDate(exchangeEndDate);
                    favoriteActivityDescriptionList.add(activityDescription);
                }

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

    @Override
    protected void onPostExecute(Void result)
    {
        //do something with favoriteActivityDescriptionList
    }
}