Odtnhj

I've managed to get it to work without a dynamic key. By following this tutorial with this json:

Currently, I'm using Retrofit and trying to get a response with dynamic keys. However, the response body is always null:

This is the response format:

 "dynamic1": 
 "cityID": "id1",
 "priceRange": 15
 ,
 "dynamic2": 
 "cityID": "id2",
 "priceRange": 15
 

In APIUtils.java

 public static CityService getCitiesService() 
 return RetrofitClient.getClient(BASE_URL).create(CityService.class);
 

In CityService.java

public interface CityService 

 @GET("/SAGetStrollAwayCity")
 Call<CityResponse> getCities();

 @GET("/SAGetStrollAwayCity")
 Call<CityResponse> getCities(@Query("tagged") String tags);

In CityResponse.java:

public class CityResponse 
 /*@SerializedName("results")
 @Expose*/ // is this the correct way?
 private Map<String, CityDetails> city = new HashMap<>();

 public Map<String, CityDetails> getCity() 
 return city;
 

 public void setCity(Map<String, CityDetails> elemDetails) 
 this.city = elemDetails;
 

In CityDetails.java

public class CityDetails 

 @SerializedName("cityID")
 @Expose
 private String cityID;
 @SerializedName("priceRange")
 @Expose
 private Integer priceRange;

 public String getCityID() 
 return cityID;
 

 public void setCityID(String cityID) 
 this.cityID = cityID;
 

 public Integer getPriceRange() 
 return priceRange;
 

 public void setPriceRange(Integer priceRange) 
 this.priceRange = priceRange;
 

In HomeFragment.java

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
 View rootView = inflater.inflate(R.layout.fragment_home, null);
 // 2nd api call
 mServiceCity = ApiUtils.getCitiesService();
 loadCities();

 return rootView;


public void loadCities() 
 mServiceCity.getCities().enqueue(new Callback<CityResponse>() 
 @Override
 public void onResponse(Call<CityResponse> call, Response<CityResponse> response) 
 // !!! WHY IS THE RESPONSE BODY EMPTY???
 if(response.isSuccessful()) 

// adapter.updateCities(response.body().getCity());

 Log.d("MainActivity", "posts loaded from API"+ response.body().getCity());
 else 
 int statusCode = response.code();
 // handle request errors depending on status code
 
 

 @Override
 public void onFailure(Call<CityResponse> call, Throwable t) 
 //showErrorMessage();
 Log.d("MainActivity", "error loading from API");

 
 );

Personally I'd drop the CityResponse model and just work with Map<String, CityDetails>.

The retrofit interface can then be:

public interface CityService 

 @GET("/SAGetStrollAwayCity")
 Call<Map<String, CityDetails>> getCities();

 @GET("/SAGetStrollAwayCity")
 Call<Map<String, CityDetails>> getCities(@Query("tagged") String tags);

In your scenario, the response body is empty because CityResponse would map to a json like:

 "city": 
 "dynamic1": 
 "cityID": "id1",
 "priceRange": 15
 ,
 "dynamic2": 
 "cityID": "id2",
 "priceRange": 15
 
 

However, you don't have a root element called city. The json itself can already be mapped to a java Map.

Hope this helps.