Java – how to pass map parameters or objects to post requests through transformation?

I encountered a problem passing a map parameter or object to a retrofit post request

I follow square, kdubb labs tutorial and this thread, I can't figure it out

How my current code works:

public interface FacebookUser {
    @FormUrlEncoded
    @POST("/user/login-facebook")
    void login(
            @Field("fb_access_token") String fbAccessToken,@Field("os") String os,@Field("device") String device,@Field("os_version") String osVersion,@Field("app_version") String appVersion,@Field("online") String online,Callback<FacebookLoginUserResponse> callback
    );
}

And code:

RestAdapter restAdapter = new RestAdapter.Builder()
                        .setServer(requestMaker.getUrl())
                        .build();

FacebookUser facebookUser = restAdapter.create(FacebookUser.class);
facebookUser.login(getFbAccessToken(),getString(R.string.config_os),Info.getAndroidId(getBaseContext()),Build.VERSION.RELEASE,Info.getAppVersionName(getBaseContext()),"" + 1,new Callback<FacebookLoginUserResponse>() {
    @Override
    public void success(FacebookLoginUserResponse facebookLoginUserResponse,Response response) {
    }

    @Override
    public void failure(RetrofitError retrofitError) {
    }
});

When I try to use this interface, I receive a missing parameter from the server:

public interface FacebookUser {
    @POST("/user/login-facebook")
    void login(
            @Body Map<String,String> map,Callback<FacebookLoginUserResponse> callback
    );
}

And maps:

HashMap<String,String> map = new HashMap<String,String>();
    map.put("fb_access_token",getFbAccessToken());
    map.put("os","android");
    map.put("device",Info.getAndroidId(getBaseContext()));
    map.put("os_version",Build.VERSION.RELEASE);
    map.put("app_version",Info.getAppVersionName(getBaseContext()));
    map.put("online","" + 1);

Question: what's the matter? How to pass object requests?

Solution

So now we can implement this thing (version 1.5.0)

@FormUrlEncoded
@POST("/oauth/access_token")
void getToken(
    @FieldMap Map<String,String> params,Callback<FacebookLoginUserResponse> callback
);