Getting list of cities. [for M-Tender project]

SomePresenter.java

public void getRegionsList() {
        Log.d("mtender", "ProfilePresenter > getRegionsList");

        final LinkedHashMap<Integer, List<SpinnerItem>> regionsWithCities = new LinkedHashMap<>();
        final List<SpinnerItem> regionsList = new ArrayList<>();

        String USER_REGIONS_URL = "http://46.101.144.46/frontend/web/api/v1/region/list";
        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url(USER_REGIONS_URL)
                .addHeader("Content-Type", "application/json")
                .get()
                .build();

        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                e.printStackTrace();
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                int statusCode = response.code();
                String body = response.body().string();
                Log.d("mtender", "Code > " + statusCode);
                Log.d("mtender", "Body > " + body);

                try {
                    JSONArray regions = new JSONArray(body);
                    for (int i = 0; i < regions.length(); i++) {
                        String name = regions.getJSONObject(i).getString("name");
                        int id = regions.getJSONObject(i).getInt("id");
                        regionsList.add(new SpinnerItem(id, name));
                        List<SpinnerItem> citiesList = new ArrayList<>();
                        citiesList.add(new SpinnerItem(0, "Не задано"));
                        JSONArray cities = regions.getJSONObject(i).getJSONArray("cities");
                        for(int j = 0; j < cities.length(); j++) {
                            citiesList.add(new SpinnerItem(
                               cities.getJSONObject(j).getInt("id"),
                                    cities.getJSONObject(j).getString("name")
                            ));
                        }
                        regionsWithCities.put(
                                id,
                                citiesList
                        );
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                if(isViewAttached()) {
                    getView().fillRegionsWithCities(regionsWithCities, regionsList);
                }
            }
        });
    }