gistfile1.txt

subscription = Observable
        .defer(new Func0<Observable<String>>() {
            @Override
            public Observable<String> call() {
                Log.d("RX",".just( ) then .defer( )");
                return Observable.just(withOutAsyncTask());

            }


        })
         .map(new Func1<String, List<GRO_VO>>() {
                    @Override
                    public List<GRO_VO> call(String jsonIn) {
                        Log.d("RX", ".map");
                        Gson gson = new Gson();
                        Type listType = new TypeToken<List<GRO_VO>>() {

                        }.getType();
                        return eventJoinList = gson.fromJson(jsonIn, listType);


                    }


                })
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                
                .subscribe(new Action1<List<GRO_VO>>() {
                    @Override
                    public void call(List<GRO_VO> gro_vos) {
                        Log.d("RX", ".subscribe");
                        recyclerView.setAdapter(new EventJoinAdapter(gro_vos));
                    }
                });
                
                
                
  ////////////////////////////////////////////
  
  public String withOutAsyncTask() {
        String GroURL;
        GroURL = theURL.URL + "GroupServlet";
        String mem_noMy1 = "6";

        //      Log.d(TAG, "GroURL=" + GroURL);
        String jsonIn = "";
        JsonObject jsonObject = new JsonObject();
        jsonObject.addProperty("action", "getEventOthersHostNotOver");
        jsonObject.addProperty("mem_no", mem_noMy1);


        try {
            jsonIn = okHttpPost(GroURL, jsonObject.toString());

        } catch (IOException e) {
            e.printStackTrace();
        }
        return jsonIn;

    }