Volley onResponse 内的 MPAndroidChart

美好的一天，我一直在努力解决这个问题好几天了。我正在尝试获取一些 json 数据并将其放置为 MPandroidChart 库的饼图条目。如果我只是将它放在 onCreate 方法中并手动提供输入而不像这样，则该库可以完美运行：

pie_entry.add(new PieEntry(5, "test"));

但是我将它放在 volley 的 onResponse 方法中的那一刻，或者如果我尝试获取条目并将其发送到另一个方法然后将其添加到 pieChart，或者如果我尝试将条目添加到全局可验证然后添加到图表它不会工作。这是我的代码：

String tag_String_reg = "reg_GetVoteResults";

    db = new SQLiteHandler(getApplicationContext());
    final HashMap<String, Object> myData;
    myData = db.getUserIDAndOrg();
    int userID = (int) myData.get(db.KEY_USER_ID);
    final String mOrg = (String) myData.get(db.KEY_USER_UID);

    StringRequest stringRequest = new StringRequest(Request.Method.POST,
            AppConfig.URL_GET_VOTERESULTS, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            try {
                JSONArray JArray = new JSONArray(response);
                for (int i = 0; i < JArray.length(); i++) {
                    JSONObject answerInfo = JArray.getJSONObject(i);
                    String answer = answerInfo.getString("answer");
                    float vote = answerInfo.getInt("answer_vote");
                    //vote_count = new ArrayList<>();
                    //anslist = new ArrayList<>();
                    //vote_count.add(vote);
                    //anslist.add(answer);
                    pie_entry.add(new PieEntry(vote, answer));
                }
                pie_entry.add(new PieEntry(5, "test"));
                pie_entry.add(new PieEntry(7, "test2"));
                Log.wtf("current name and int ", pie_entry.toString());
                //testing(pie_entry);
                //Log.wtf("final result: ", pe.toString());
                pieChart.setUsePercentValues(true);
                //Log.wtf("inside chart ", pe.toString());
                pieChart.getDescription().setEnabled(false);
                pieChart.setExtraOffsets(5, 10, 5, 5);
                pieChart.setDragDecelerationFrictionCoef(0.95f);
                pieChart.setDrawHoleEnabled(true);
                pieChart.setHoleColor(WHITE);
                pieChart.setTransparentCircleRadius(61f);

                PieDataSet dataSet = new PieDataSet(pie_entry, "Voting Results");
                dataSet.setSliceSpace(3f);
                dataSet.setSelectionShift(5f);
                dataSet.setColors(ColorTemplate.JOYFUL_COLORS);

                PieData data = new PieData((dataSet));
                data.setValueTextSize(10f);
                data.setValueTextColor(Color.YELLOW);

                pieChart.setData(data);
            } catch (JSONException e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), "Didnt work. Catch. "+ response.toString(), Toast.LENGTH_LONG).show();
                Log.d(TAG, "Didnt work. Error : "+e.toString());

            }

        }
    },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    if(error.getMessage()==null){
                        Toast.makeText(getApplicationContext(), " ERROR ", Toast.LENGTH_LONG).show();
                    }else{
                        Toast.makeText(getApplicationContext(), "Error. Please check your internet connection. ErrorListener. " + error.getMessage(), Toast.LENGTH_LONG).show();


                    }

                }
            }){
        @Override
        protected Map<String, String> getParams() {
            Map<String, String> params = new HashMap<String, String>();
            params.put("org_id", mOrg);
            params.put("question_id", question_id);
            return params;
        }
    };
    AppController.getInstance().addToRequestQueue(stringRequest, tag_String_reg);`

我很肯定 json 响应有效，因为我通过Log.wtf任何帮助检查了它，将不胜感激。

另外，logcat 中没有错误，它显示的只是我的 Log.wtf 的结果：

current name and int: [Entry, x: 0.0 y: 1.0, Entry, x: 0.0 y: 1.0, Entry, x: 0.0 y: 5.0, Entry, x: 0.0 y: 7.0]