Serialize Query-Parameter in Retrofit

Question

Imagine the following request:

@POST(\"/recipes/create\")
void createRecipe(@Query(\"recipe\") Recipe recipe, Callback callback);

Answer 1

As @Rolf mentioned, there is a way to set customConverter.Factory Example:

    public class QueryConverterFactory extends Converter.Factory {
    public static QueryConverterFactory create() {
        return new QueryConverterFactory();
    }

    private QueryConverterFactory() {
    }

    @Nullable
    @Override
    public Converter stringConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
        if (type == Date.class) {
            return DateQueryConverter.INSTANCE;
        }
        return null;
    }

    private static final class DateQueryConverter implements Converter {
        static final DateQueryConverter INSTANCE = new DateQueryConverter();

        private static final ThreadLocal DF = new ThreadLocal() {
            @Override
            public DateFormat initialValue() {
                return new SimpleDateFormat("yyyy-MM-dd");
            }
        };

        @Override
        public String convert(Date date) {
            return DF.get().format(date);
        }
    }
}

You can add converters for your own types.