尝试从响应中在android中的空对象引用上调用虚拟方法'java.lang.String java.lang.Object.toString（）'

Question

您好，在下面的代码中，我面对列表的空对象引用。在下面的代码中。 访问状态是一个数组，状态下包含对象列表。

我正在尝试访问对象，但是我面临空对象引用

if(isOn) {

                    Retrofit retrofit = new Retrofit.Builder ( )
                            .baseUrl (API.URL_BASE)
                            .addConverterFactory (ScalarsConverterFactory.create ( ))
                            .addConverterFactory (GsonConverterFactory.create ( )).build ( );
                    API service = retrofit.create (API.class);
                    lightID = "1234";
                    lightType = "1";
                    level = "4";
                    List<OnOffStatusList> onOffStatusListList=new ArrayList <> ();


                    try {
                        if (OnOFF.isOn ( )) {
                            Status = "1";

                        } else {
                            Status = "0";
                        }
                        JSONObject parmobject = new JSONObject ( );
                        parmobject.put ("Status", Status);
                        parmobject.put ("lightID", lightID);
                        parmobject.put ("lightType", lightType);
                        parmobject.put ("level", level);
                        // luminary.setImageDrawable(ContextCompat.getDrawable(getContext (), R.drawable.luminaryon));


                        Call<List<OnOffStatusList>> userCall = service.getMyJSON (parmobject.toString ());
                        userCall.enqueue(new Callback<List<OnOffStatusList>> () {

                            @Override
                            public void onResponse(Call<List<OnOffStatusList>> userCall, Response<List<OnOffStatusList>> response) {
                                String response1= response.body ().toString ();

                                Log.d ("response code",response1);
                                if (response1!=null && response1.equalsIgnoreCase ("200")) {
                                    luminary.setImageDrawable (ContextCompat.getDrawable (getContext ( ), R.drawable.luminaryon));

                                    //onoffStatusList=response