多次尝试后，jsonObjectRequest 和 StringRequest 响应侦听器不起作用

问题描述

我采用了文档中的示例代码，即来自 youtube 视频的代码。在新的响应中什么也没有发生。侦听器和 onResponse 函数甚至没有被调用。即使我在里面放了一个断点也无法调试它，不明白什么不起作用，onErrorResponse函数或try-catch块中没有捕获错误。

代码：

    ListView statlist;
    RecyclerView recyclerView;
    String dcritical,dpositive,dtoday_cases,dtotal_deaths,dtotalcases,dtotal_countries,test;

    public void FetchAPI_Data()
    {
      //  String url = "https://corona.lmao.ninja/v2/all";



        String url  = "https://corona.lmao.ninja/v2/all/";

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET,url,null,new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    test = response.toString();
                    JSONObject jsonObject = new JSONObject(response.toString());
                    Log.d("JSON",jsonObject.getString("recovered"));

                    String recovered = jsonObject.getString("recovered");
                    Log.d("RECOVERED",recovered.toString());
                    String critical = jsonObject.getString("critical");
                    String positive = jsonObject.getString("active");
                    String today_cases = jsonObject.getString("todayCases");
                    String total_deaths = jsonObject.getString("deaths");
                    String total_countries = jsonObject.getString("affectedCountries");
                    String totalcases = jsonObject.getString("cases");


                    dcritical = critical;
                    dpositive = positive;
                    dtoday_cases = today_cases;
                    dtotal_deaths = total_deaths;
                    dtotal_countries = total_countries;
                    dtotalcases = totalcases;
                } catch (JSONException e) {
                    e.printstacktrace();
                }
            }
        },new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });

        RequestQueue requestQueue = Volley.newRequestQueue(this);
        requestQueue.add(jsonObjectRequest);



        //GlobalStatsData data= new GlobalStatsData(dcritica);
        //return data;


    }

JSON 响应格式

{
    "updated": 1621228955561,"cases": 163724238,"todayCases": 12591,"deaths": 3393440,"todayDeaths": 222,"recovered": 143348966,"todayRecovered": 31533,"active": 16981832,"critical": 102549,"casesPerOneMillion": 21004,"deathsPerOneMillion": 435.3,"tests": 2324559552,"testsPerOneMillion": 297062.96,"population": 7825140972,"oneCasePerPeople": 0,"oneDeathPerPeople": 0,"oneTestPerPeople": 0,"undefined": 0,"activePerOneMillion": 2170.16,"recoveredPerOneMillion": 18319.03,"criticalPerOneMillion": 13.11,"affectedCountries": 222
}

解决方法

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