java - 无法解析构造函数 'BarEntry(java.lang.String, java.lang.Float)

Question

我想从下面的 json 数据创建 agraph

    [{"month":"August 2020","total":"4587175.08"},{"month":"July 2020","total":"9151128.27"},{"month":"June 2020","total":"10859553.16"},{"month":"May 2020","total":"2600435.33"}]

该数据是从数据库到我的图表，但我收到了上面的错误
我插入全文的代码如下

      public void onResponse(@NotNull Call<List<MonthlySales>> call, @NotNull Response<List<MonthlySales>> response) {
            //check if the response body is null
            if(response.body()!=null){
                List<BarEntry> barEntries = new ArrayList<>();
                for (MonthlySales monthlySales : response.body()) {
                    barEntries.add(new BarEntry(monthlySales.getMonth(),monthlySales.getTotal()));
                }
                BarDataSet dataSet = new BarDataSet(barEntries,"Monthly Sales");
                dataSet.setColors(ColorTemplate.MATERIAL_COLORS);
                BarData data = new BarData(dataSet);
                data.setBarWidth(10f);
                chart.setVisibility(View.VISIBLE);
                chart.animateXY(2000, 2000);
                chart.setData(data);
                chart.setFitBars(true);
                Description description = new Description();
                description.setText("Sales per month");
                chart.setDescription(description);
                chart.invalidate();

我可能做错了什么？请注意，月份应该是 xaxis 标签，而总 yaxis 应该是这个月，我怎么能做到这一点？

Answer 1

A constructor in Java is a special method that is used to initialiseobjects. The constructor is called when an object of a class iscreated.

import com.github.mikephil.charting.data.BarDataSet;
import com.github.mikephil.charting.data.BarEntry;

查询 BarEntry 类(class)。

/**
 * Constructor for normal bars (not stacked).
 *
 * @param x
 * @param y
 */
public BarEntry(float x, float y) {
    super(x, y);
}


public BarEntry(float x, float y, Object data) {
    super(x, y, data);
}


public BarEntry(float x, float y, Drawable icon) {
    super(x, y, icon);
}


public BarEntry(float x, float y, Drawable icon, Object data) {
    super(x, y, icon, data);
}


public BarEntry(float x, float[] vals) {
    super(x, calcSum(vals));

    this.mYVals = vals;
  
}


public BarEntry(float x, float[] vals, Object data) {
    super(x, calcSum(vals), data);

    this.mYVals = vals;
  
}


public BarEntry(float x, float[] vals, Drawable icon) {
    super(x, calcSum(vals), icon);

    this.mYVals = vals;
   
}


public BarEntry(float x, float[] vals, Drawable icon, Object data) {
    super(x, calcSum(vals), icon, data);

    this.mYVals = vals;
    
}

演示

 ArrayList<BarEntry> barEntries = new ArrayList<>();
         
 barEntries.add(new BarEntry(1f, 0));
 barEntries.add(new BarEntry(2f, 1));