我想制作折线图,但我有问题在xAxis中显示值字符串,我使用Library Github从MPAndroidChart到LineChart.请帮我如何添加字符串值,实际上我想问的问题

private void drawLineChartLine(){

        private float[] yDataL = {40, 60, 70, 80};
        private String[] xDataL = {"Week 1", "Week 1" , "Week 3" , "Week 4"};


        ArrayList<Entry> yEntrys = new ArrayList<>();

        final ArrayList<String> xEntrys = new ArrayList<>();

        for(int i = 0; i < yDataL.length; i++){
            yEntrys.add(new Entry(yDataL[i] ,i));
        }

        for(int i = 1; i < xDataL.length; i++){
            xEntrys.add(xDataL[i]);
        }

        //create the data set
        LineDataSet lineDataset = new LineDataSet(yEntrys, "assa");

        XAxis xAxis = lineChart.getXAxis();
        xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
        xAxis.setDrawGridLines(false);


        xAxis.setValueFormatter(new IAxisValueFormatter() {
            @Override
            public String getFormattedValue(float value, AxisBase axis) {
                return xEntrys.get((int) value);
            }
        });

        LineData lineData = new LineData(lineDataset);
        lineChart.setData(lineData);
        lineChart.invalidate();
}

我收到了错误

Invalid index 40, size is 6

在代码中

xAxis.setValueFormatter(new IAxisValueFormatter() {
            @Override
            public String getFormattedValue(float value, AxisBase axis) {
                return xEntrys.get((int) value);
            }
        });

解决方法:

您正在访问超出范围的ArrayList索引,因为您尝试使用value作为索引.您需要找到值的索引才能返回它.

xAxis.setValueFormatter(new IAxisValueFormatter() {
    @Override
    public String getFormattedValue(float value, AxisBase axis) {
       for (int i = 0 ; i < yEntrys.size(); ++i) {
           if (yEntrys.get(i).equals(value)) {
               return xEntrys.get(i);
           }
       }
       return null;
    }
});