Model Class for Zomato Android API
<p>Hello I am trying to develop an app for which I need a list of restaurants in a particular city. I am trying to use the Zomato API for the same. From the documentation at <a href="https://developers.zomato.com/documentation" rel="nofollow">https://developers.zomato.com/documentation</a>, I felt the /geocode method to be the closest fit for what I needed. A sample response for this looks like the following -</p>

<pre><code>{"location": {
"entity_type": "",
"entity_id": 0,
"title": "Al Quoz",
"latitude": "25.1345620000",
"longitude": "55.2365110000",
"city_id": 51,
"city_name": "Dubai",
"country_id": 214,
"country_name": "UAE"
},
 "popularity": {
"popularity": "2.02",
"nightlife_index": "0.00",
"nearby_res": [
  "18274882",
  "206670",
  "18279664",
  "18264893",
  "208532",
  "210411",
  "207764",
  "18279641",
  "203695"
],
"top_cuisines": [
  "Indian",
  "Chinese",
  "Middle Eastern",
  "Pakistani",
  "Arabian"
],
"popularity_res": "100",
"nightlife_res": "10",
"subzone": "Al Quoz",
"subzone_id": 51301,
"city": "Dubai"
 },
 "link": "https://www.zomato.com/dubai/al-quoz-restaurants?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1",
  "nearby_restaurants": {
"1": {
  "restaurant": {
    "R": {
      "res_id": 18274882
    },
    "apikey": "--",
    "id": "18274882",
    "name": "Ice Lab",
    "url": "https://www.zomato.com/dubai/ice-lab-al-quoz?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1",
    "location": {
      "address": "Behind Al Quoz Pond Park, Meydan Road, Al Quoz, Dubai",
      "locality": "Al Quoz",
      "city": "Dubai",
      "city_id": 51,
      "latitude": "0.0000000000",
      "longitude": "0.0000000000",
      "zipcode": "",
      "country_id": 214
    },
    "cuisines": "Ice Cream",
    "average_cost_for_two": 85,
    "price_range": 2,
    "currency": "AED",
    "offers": [],
    "thumb": "https://b.zmtcdn.com/images/res_avatar_120_1x_new.png",
    "user_rating": {
      "aggregate_rating": "3.7",
      "rating_text": "Very Good",
      "rating_color": "5BA829",
      "votes": "30"
    },
    "photos_url": "https://www.zomato.com/dubai/ice-lab-al-quoz/photos#tabtop?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1",
    "menu_url": "https://www.zomato.com/dubai/ice-lab-al-quoz/menu#tabtop?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1",
    "featured_image": "",
    "has_online_delivery": 0,
    "is_delivering_now": 0,
    "deeplink": "zomato://r/18274882",
    "events_url": "https://www.zomato.com/dubai/ice-lab-al-quoz/events#tabtop?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1"
  }
},
"2": {
  "restaurant": {
    "R": {
      "res_id": 206670
    },
    "apikey": "--",
    "id": "206670",
    "name": "Dubai Amaravathi",
    "url": "https://www.zomato.com/dubai/dubai-amaravathi-al-quoz?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1",
    "location": {
      "address": "Behind Old Grand Mall, Al Quoz, Dubai",
      "locality": "Al Quoz",
      "city": "Dubai",
      "city_id": 51,
      "latitude": "25.1465708500",
      "longitude": "55.2434410527",
      "zipcode": "",
      "country_id": 214
    },
    "cuisines": "Indian, North Indian, South Indian, Chinese",
    "average_cost_for_two": 50,
    "price_range": 2,
    "currency": "AED",
    "offers": [],
    "thumb": "https://b.zmtcdn.com/data/pictures/0/206670/a6140b8b6205d23c5fa123c7faeb7857_res_featured_thumb.png",
    "user_rating": {
      "aggregate_rating": "3.2",
      "rating_text": "Good",
      "rating_color": "9ACD32",
      "votes": "40"
    },
    "photos_url": "https://www.zomato.com/dubai/dubai-amaravathi-al-quoz/photos#tabtop?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1",
    "menu_url": "https://www.zomato.com/dubai/dubai-amaravathi-al-quoz/menu#tabtop?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1",
    "featured_image": "https://b.zmtcdn.com/data/pictures/0/206670/a6140b8b6205d23c5fa123c7faeb7857_featured_v2.png",
    "has_online_delivery": 1,
    "is_delivering_now": 1,
    "deeplink": "zomato://r/206670",
    "order_url": "https://www.zomato.com/dubai/dubai-amaravathi-al-quoz/order?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1",
    "order_deeplink": "",
    "events_url": "https://www.zomato.com/dubai/dubai-amaravathi-al-quoz/events#tabtop?utm_source=api_basic_user&amp;utm_medium=api&amp;utm_campaign=v2.1"
  }
}
}
}
}
</code></pre>

<p>I am trying to create a Android Model class for the same in order to parse the response using GSON. My aim is to simply get the "restaurant" objects into a List so that I can give them to the card view adapter.</p>

<p>Currently this is what my model looks like -</p>

<pre><code>public class RestaurantsZomato {

public LocationDetails location;
public Popularity popularity;
public String link;
public NearbyRestaurants nearby_restaurants;

public static class LocationDetails {
    public String entity_type;
    public int entity_id;
    public String title;
    public String latitude;
    public String longitude;
    public int city_id;
    public String city_name;
    public int country_id;
    public String country_name;
}

public static class Popularity {
    public String popularity;
    public String nightlife_index;
    public List&lt;String&gt; nearby_res;
    public List&lt;String&gt; top_cuisines;
    public String popularity_res;
    public String nightlife_res;
    public String subzone;
    public int subzone_id;
    public String city;
}

public static class NearbyRestaurants {

    public RestaurantDetails restaurant;
}

public class RestaurantDetails {

public Rest R;
public String apikey;
public String id;
public String name;
public String url;
public LocationDetails location;
public String cuisines;
public String average_cost_for_two;
public String price_range;
public String currency;
public List&lt;String&gt; offers;
public String thumb;
public UserRating user_rating;
public String photos_url;
public String menu_url;
public String featured_image;
public String has_online_delivery;
public String is_delivering_now;
public String deeplink;
public String events_url;
public String all_reviews_count;
public String photo_count;
public String phone_numbers;

public LocationDetails getLocation(){
    return location;
}

public static class LocationDetails {
    public String address;
    public String locality;
    public String city;
    public String latitude;
    public String longitude;
    public String zipcode;
    public String country_id;

    public String getAddress() {
        return address;
    }
}

  public static class UserRating {
    public static String aggregate_rating;
    public String rating_text;
    public String rating_color;
    public String votes;
}

public static class Rest {
    public float res_id;
}
</code></pre>

<p>}</p>

<p>And in my Fragment after the web service I'm parsing it like this -</p>

<pre><code>Ion.getDefault(getActivity()).configure().setLogging(getString(R.string.app_name), Log.DEBUG);
            Ion.with(getActivity())
                    .load("https://developers.zomato.com/api/v2.1/geocode?lat=25.12819&amp;lon=55.22724")
                    .setHeader("user-key","my-user-key")
                    .asJsonObject()
                    .setCallback(new FutureCallback&lt;JsonObject&gt;() {
                        @Override
                        public void onCompleted(Exception e, JsonObject result) {

                                Log.d("FoodFragment", result.toString());
                                RestaurantsZomato r = (RestaurantsZomato) new Gson().fromJson(result.toString(), new TypeToken&lt;RestaurantsZomato&gt;(){}.getType());
                                JsonObject nearby_restaurants = result.get("nearby_restaurants").getAsJsonObject();
                                Log.d("RestDetails",nearby_restaurants.toString());

                                JsonObject rest = nearby_restaurants.get("1").getAsJsonObject();
                                Log.d("RestZomato", rest.toString());
                                JsonObject details = rest.get("restaurant").getAsJsonObject();
                                Log.d("RestZomato", details.toString());
                                RestaurantDetails ad = new Gson().fromJson(details, new TypeToken&lt;RestaurantDetails&gt;(){}.getType());

                                Set&lt;Map.Entry&lt;String, JsonElement&gt;&gt; objects =  nearby_restaurants.entrySet();
                                for (Map.Entry&lt;String, JsonElement&gt; entry : objects) {
                                    System.out.println(entry.getKey() + "/" + entry.getValue());
                                    if (entry.getValue() != null) {
                                        RestaurantDetails rd = new Gson().fromJson(entry.getValue(), RestaurantDetails.class);
                                        Log.d("simpletest",rd.getLocation().getAddress());
                                        sTrips.add(rd);
                                    }
                                }

                               adapter = new RestaurantAdapter(sTrips);
                                recyclerView.setAdapter(adapter);
                        }
                    });
        }
</code></pre>

<p>where sTrips is an object of type RestaurantDetails. I'm getting an exception in the line sTrips.add(rd) since rd is null. However I can't figure out what I am doing wrong. Please help! </p>

<p>The stacktrace is as follows:</p>

<pre><code>FATAL EXCEPTION: main
java.lang.NullPointerException
at majorproject.amity.smarttourist.fragments.FoodFragment$2.onCompleted(FoodFragment.java:161)
at majorproject.amity.smarttourist.fragments.FoodFragment$2.onCompleted(FoodFragment.java:131)
at com.koushikdutta.async.future.SimpleFuture.handleCallbackUnlocked(SimpleFuture.java:107)
at com.koushikdutta.async.future.SimpleFuture.setComplete(SimpleFuture.java:141)
at com.koushikdutta.async.future.SimpleFuture.setComplete(SimpleFuture.java:128)
at com.koushikdutta.ion.IonRequestBuilder$1.run(IonRequestBuilder.java:246)
at com.koushikdutta.async.AsyncServer$RunnableWrapper.run(AsyncServer.java:57)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5419)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
at dalvik.system.NativeStart.main(Native Method)
</code></pre>

<p><strong>UPDATE</strong>
The error is the line Log.d("simpletest",rd.getLocation().getAddress());</p>

<p>I have debugged it and found that the value of rd is indeed null. <a href="http://i.stack.imgur.com/Q81g3.jpg" rel="nofollow">Here is an image showing the debug</a></p>