Handle different JSON response types from same endpoint in RetroFit

Question

I need help.

I have an endpoint that takes a parameter. Depending on this parameter, the JSON returned will be completely different.

Is it possi

Answer 1

you can use JsonElement in such as follow : in ApiInterface.java :

@GET("web api url")
Call<JsonElement> GetAllMyClass();

than in MyActivity :

ApiInterface client = ApiClient.getClient().create(ApiInterface.class);

    Call<JsonElement> call = client.GetAllMyClass();
    call.enqueue(new Callback<JsonElement>() {
       @Override
       public void onResponse(Call<JsonElement> call, Response<JsonElement> response) {
                if (response.isSuccessful()) {
                     JsonElement questions = response.body();

 // if response type is array
                     List<MyClass> response_array = new Gson().fromJson(((JsonArray)questions), new TypeToken<List<MyClass>>(){}.getType());

 // if response type is object
                     MyClass response_one = new Gson().fromJson(questions.getAsJsonObject(), MyClass.class);
                 } else {
                      Log.d("MyClassCallback", "Code: " + response.code() + " Message: " + response.message());
                        }
                    }

      @Override
      public void onFailure(Call<JsonElement> call, Throwable t) {
               t.printStackTrace();
       }
    });

Answer 2

Just to close this off.

You can get the raw JSON back from RetroFit and use GSON to manually serialise to the class type you want.

For example:

RestClient.get().getDataFromServer(params, new Callback<JSONObject>() {
    @Override
    public void success(JSONObject json, Response response) {
        if(isTypeA) {
            //Use GSON to serialise to TypeA        
        } else {
            //Use GSON to serialise to TypeB
        }
    }
});

Answer 3

In this response, since it is only change in the fields but not the structure like array or object. In that case just define all the fields in the java object, the values that will be returned in that specific call will be mapped and the others will be null. Put a logic on your end to check null checks.