如何使用Volley从API显示图表

如何解决如何使用Volley从API显示图表

我最近一直在开发一个应用程序，该应用程序需要显示从API作为JSON数据从API检索到的员工的统计信息以显示为图表，我正在与MP Android Chart和Volley一起获取和显示数据

我一直在尝试我能找到的所有方法，但似乎无法正常工作，它会导致应用程序崩溃或不显示任何数据。

我的问题：这里的方法有什么问题？

    public static String SalesURL = "http://-------------------------";
    public static final String Key_SalespersonID = "id";
    public static final String Key_Year = "year";
    private String id;
    private String year;
    private RequestQueue queue;
    private BarChart chart;
    BarData data;
    BarEntry values;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_sp_main);

            chart = findViewById(R.id.chart);
            XAxis xAxis = chart.getXAxis();
            xAxis.setPosition(XAxis.XAxisPosition.BottOM);
            xAxis.setGranularity(1f);
            xAxis.setGranularityEnabled(true);
            YAxis rightAxis = chart.getAxisRight();
            rightAxis.setEnabled(false);
   
            queue = Volley.newRequestQueue(this);

            DateFormat dateFormat = new SimpleDateFormat("yyyy");
            Date date = new Date();
            year = dateFormat.format(date);
            salesid = "1";
            load_data_from_server();
    }

从服务器加载数据

    private void load_data_from_server(){
            Description description = new Description();
            description.setText("Sales");

            StringRequest request = new StringRequest(Request.Method.POST,SalesURL,new Response.Listener<String>() {
                        @Override
                        public void onResponse(String response) {
                            try {
                                JSONArray jsonArray = new JSONArray(response);
                                for(int i=0;i<jsonArray.length();i++){
                                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                                    String Month = jsonObject.getString("Month").trim();
                                    String InvoiceAmount = jsonObject.getString("Sales").trim();
                                    ArrayList<BarEntry> entries = new ArrayList<>();
                                    entries.add(new BarEntry(Float.parseFloat(InvoiceAmount),0));

                                    ArrayList<String> labels = new ArrayList<String>();
                                    labels.add(Month.substring(0,3));

                                    BarDataSet barDataSet = new BarDataSet(entries,"Sales");
                                    barDataSet.setColor(Color.rgb(0,82,159));

                                    data = new BarData((IBarDataSet) labels,barDataSet);
                                    chart.setDescription(description);
                                    chart.animateXY(2000,2000);
                                    chart.setData(data);
                                    chart.notifyDataSetChanged();
                                    chart.invalidate();
                                }
                            } catch (Exception e) {
                                Toast.makeText(SP_MainActivity.this,e.getMessage(),Toast.LENGTH_LONG).show();
                            }
                        }
                    },new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError error) {
                            if(error != null){
                                Toast.makeText(getApplicationContext(),error.toString(),Toast.LENGTH_SHORT);
                            }
                        }
                    }){
                @Override
                protected Map<String,String> getParams() throws AuthFailureError {
                    Map<String,String> map = new HashMap<String,String>();
                    map.put(Key_SalespersonID,id);
                    map.put(Key_Year,year);
                    return map;
                }
            };
            queue.add(request);
        }

我的Json数据

    [

       {

          "Month":"January","Salesperson":1,"Sales":"608.00"

       },{
          "Month":"February","Sales":"109.20"

       },{
          "Month":"march","Sales":"509.10"
       }
    ]