Gson deserializer with Retrofit converter: just need inner JSON for all responses

Question

I am working with an API that always responds like so:

{
\"stuff_i_need\": [
    {
        \"title\": \"Hello\"
    },
    {
        \"title\": \"World!\"
    }
         


        

Answer 1

With some help from Gowtham, I ended up doing the following:

private static class ItemTypeAdapterFactory implements TypeAdapterFactory {

    @Override
    public  TypeAdapter create(Gson gson, final TypeToken type) {

        final TypeAdapter delegate = gson.getDelegateAdapter(this, type);
        final TypeAdapter elementAdapter = gson.getAdapter(JsonElement.class);

        return new TypeAdapter() {
            @Override
            public void write(JsonWriter out, T value) throws IOException {
                delegate.write(out, value);
            }

            @Override
            public T read(JsonReader in) throws IOException {
                JsonElement jsonElement = elementAdapter.read(in);
                if (jsonElement.isJsonObject()) {
                    JsonObject jsonObject = jsonElement.getAsJsonObject();
                    if (jsonObject.entrySet().size() == 2) {
                        jsonObject.remove("status");
                        jsonElement = jsonObject.entrySet().iterator().next().getValue();
                    }
                }
                return delegate.fromJsonTree(jsonElement);
            }
        }.nullSafe();
    }
}

and this is set on the RestAdapter.Builder:

.setConverter(new GsonConverter(new GsonBuilder()
                .registerTypeAdapterFactory(new ItemTypeAdapterFactory())
                .create()))

I really just ended up removing the "status" JsonObject.