Retrofit nullable params map

user_4797289 0
Viewed 1263

I have the interface for retrofit

interface ApiInterface {

    @GET
    Observable<okhttp3.ResponseBody> get(@Url String url,
                                         @HeaderMap Map<String, Object> headerMap,
                                         @QueryMap HashMap<String, String> queryMap );
}

I call this way, and it works perfectly

HashMap<String, String> map = new HashMap<String, String>();
map.put("id","xyz");
apiInterface.get(url,  getHeader(),map)
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread());

but when I pass null, it does not work 

return apiInterface.get(url,  getHeader(),null)
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread());

how pass null for retrofit an interface?

retrofit2 android java
2 Answers

You cannot pass null basically. Two possible solutions.

  1. Either use an empty HashMap<> 

          new HashMap<>()

  2. Write another api call without that field as below.

interface ApiInterface {

@GET
Observable<okhttp3.ResponseBody> get(@Url String url,
                                     @HeaderMap Map<String, Object> headerMap,
                                     @QueryMap HashMap<String, String> queryMap );

}

interface ApiInterface {

@GET
Observable<okhttp3.ResponseBody> get(@Url String url,
                                     @QueryMap HashMap<String, String> queryMap );

}

You can find more details you can read here: https://github.com/square/retrofit/issues/1488 (It is not my post by the way)

user_50302100

You can pass empty Map if you do not want to send any value to your request param. Use the following code.

HashMap<String, String> map = new HashMap<String, String>();
apiInterface.get(url,  getHeader(),map)
        .subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread());
user_16163170
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