public static void downloadOpeningHours()
    {
        String apiKey = "AIzaSyAyEB14KWKzlAngKDJcbcIF6vs5R-s8sqk";
        for (Results place : Database.results) {
            String query = "https://maps.googleapis.com/maps/api/place/details/json?placeid=" + place.getReference() + "&fields=name,opening_hours,photo,place_id&key=" + apiKey;
            OkHttpClient httpClient = new OkHttpClient();
            final String[] jsonResponse = new String[1];
            Request request = new Request.Builder().url(query).build();

            httpClient.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                }
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    ResponseBody responseBody = response.body();
                    if (!response.isSuccessful()) {
                        throw new IOException("Error response " + response);
                    }
                    jsonResponse[0] = responseBody.string();
                    Gson gson = new GsonBuilder().setLenient().serializeNulls().create();
                    PlaceMapper mapper = gson.fromJson(jsonResponse[0], PlaceMapper.class);
                    testClass test = new testClass();
                    test.assignHours(mapper);
                }
            });
        }
    }