GSON from remote JSON

Question

I'm trying to get a json file from remote host and parsing it via GSON.

Therefore I'm calling my function

private void initData() {
   placeArrayList = PlaceRepository.getPlaceList();
}

In my PlaceRepository-class

     public static ArrayList<Place> getPlaceList() {
    return new Gson().fromJson(json, new  TypeToken<ArrayList<Place>>(){}.getType());
}

and the referenced json is a static string:

  static String json = "[\n" +
        "  {\n" +
        "    \"id\":\"GardensByTheBay\",\n" + ...

Thats absoluty working. But now I would like to use remote json data from my server.

I'm sure that I have to use something like asynctask, right? Because I tried to load the json file and it failed with an NetworkOnMainThreadException.

Thank you!