@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    this.view = inflater.inflate(R.layout.fragment_list, container, false);

    // create instance of my async task class
    lp = new RestfulConnect(getActivity());
    // set onArrayListReady as a listener.
    lp.setOnListReady(this);
    // do the
    lp.getStationsArray(Integer.toString(this.start));
    return view;
}
@Override
public void onArrayListReady(ArrayList<Station> stations) {

    adapter = new StationListAdapter(getActivity().getApplicationContext(), R.layout.fragment_list_item, stations);
    listView = (ListView) this.view.findViewById(R.id.fragment_list_stations_list);
    listView.setAdapter(adapter);

    // Listener lie a l'action de click sur un objet de la liste
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            Station station = (Station) listView.getAdapter().getItem(i);
            Intent intent = new Intent(getActivity().getApplicationContext(), Detail.class);
            intent.putExtra("station", station);
            startActivity(intent);
        }
    });

    // Listener qui permet de charger les donnees suivantes
    listView.setOnScrollListener(new OnScrollListener() {

        @Override
        public void onScrollStateChanged(AbsListView view,
                                         int scrollState) { // TODO Auto-generated method stub
            int threshold = 1;
            int count = listView.getCount();

            if (scrollState == SCROLL_STATE_IDLE) {
                if (listView.getLastVisiblePosition() >= count - threshold) {
                    // WHERE I'D LIKE TO EXECUTE THE PREVIOUS INSTANCE OF LP
                    int start = 20;
                    this.lp.getStationsArray(Integer.toString(start));
                }
            }
        }

        @Override
        public void onScroll(AbsListView view, int firstVisibleItem,
                             int visibleItemCount, int totalItemCount) {
            // TODO Auto-generated method stub

        }

    });
}

public class RestfulConnect {


//  Constructor
public RestfulConnect(Context context) {
    this.context = context;
}

public void getStationsArray(String... filters) {

    String apiUrl = requestUrlBuilder(filters);
    ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
    if(networkInfo != null && networkInfo.isConnected()) {
        new getStationsAsync().execute(apiUrl);
    }
    else {
        Log.d(DEBUG_MAIN_CALL, "Pas de connexion disponible");
    }
}

private class getStationsAsync extends AsyncTask<String, Void, ArrayList<Station>> {

    @Override
    protected ArrayList<Station> doInBackground(String... urls) {

        String jsonString;
        JSONObject jsonObject;
        JSONArray jsonArray;
        ArrayList<Station> stations = null;

        try {
            jsonString = downloadJSON(urls[0]);
            try {
                jsonObject = new JSONObject(jsonString);
                jsonArray = new JSONArray(jsonObject.getString("records"));
                stations = createList(jsonArray);
            }
            catch (Exception e) {
                Log.d(DEBUG_JSON, "Erreur de l'objet JSON");
            }
        }
        catch (IOException e) {
            Log.d("doINBckGround", "Impossible de retrouver la page web");
            return stations;
        }
        return stations;
    }

@Override
        protected void onPostExecute(ArrayList<Station> result) {
            listener.onArrayListReady(result);
        }
    }