Retrofit 사용시 NumberformatException 발생시..

Retrofit 사용시 NumberformatException 발생시..

간혹 숫자로 변환시 빈값으로 들어오는 경우 뱉는 오류 중 하나가 NumberformatException 이다.

이럴경우 Adapter를 하나 등록하면 된다.

public class EmptyStringToNumberTypeAdapter extends TypeAdapter<Number> {
    @Override
    public void write(JsonWriter jsonWriter, Number number) throws IOException {
        if (number == null) {
            jsonWriter.nullValue();
            return;
        }
        jsonWriter.value(number);
    }

    @Override
    public Number read(JsonReader jsonReader) throws IOException {
        if (jsonReader.peek() == JsonToken.NULL) {
            jsonReader.nextNull();
            return null;
        }

        try {
            String value = jsonReader.nextString();
            if ("".equals(value)) {
                return 0;
            }
            return Integer.parseInt(value);
        } catch (NumberFormatException e) {
            throw new JsonSyntaxException(e);
        }
    }
}

만드는 쪽에서 

private static Gson getGson(){
    GsonBuilder gsonBuilder = new GsonBuilder();
    gsonBuilder.registerTypeAdapter(Integer.class , new EmptyStringToNumberTypeAdapter())
            .registerTypeAdapter(int.class, new EmptyStringToNumberTypeAdapter())
            .registerTypeAdapter(double.class, new EmptyStringToNumberTypeAdapter())
            .registerTypeAdapter(Double.class, new EmptyStringToNumberTypeAdapter());

    Gson gson = gsonBuilder.create();
    return gson;
}

public static Retrofit initRetrofit() {

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(Variable._SERVER_HOST)
            .client(Common.getClient())
            .addConverterFactory(GsonConverterFactory.create(getGson()))
            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
            .build();
    return retrofit;
}

이상입니다..