android - 如何在条形图中启用滚动并将 xAxis 标签与条形图组对齐？

Question

问题:1. x 轴值未映射到条形组，为什么？

1. 我已经通过设置 xAxis.axisMaximum = 50f 设法显示了所有条形数据，但它在图表中显示了很多“0”xAxis 标签，我该如何解决这个问题？这是代码:

   private fun populateCharts(chartData: List<ResponseGetPenetrationGrowth>){
           try {
   
               val prev_year = ArrayList<BarEntry>()
               val current_year = ArrayList<BarEntry>()
               val xAxis_label = ArrayList<String>()
               var i = 0f
               val currentYear = Calendar.getInstance().get(Calendar.YEAR)
   
               for (item in chartData!!) {
                   xAxis_label.add(item.brand)
                   prev_year.add(BarEntry(i,item.prevYear.toFloat()))
                   current_year.add(BarEntry(i,item.currentYear.toFloat()))
                   i++
               }
   
               val prevDataSet = BarDataSet(prev_year,(currentYear-1).toString())
               prevDataSet.setColors(ContextCompat.getColor(penetration_chart.context, R.color.prev_year_bar))
               val currentDataSet = BarDataSet(current_year, currentYear.toString())
               currentDataSet.setColors(ContextCompat.getColor(penetration_chart.context, R.color.current_year_bar))
   
               val barData = BarData(prevDataSet, currentDataSet)
               penetration_chart.data = barData
   
               val xAxis = penetration_chart.getXAxis()
   
               xAxis.setPosition(XAxis.XAxisPosition.BOTTOM)
               xAxis.valueFormatter = IAxisValueFormatter { value, axis ->
                   if (value.toInt()> 0 && (value.toInt() < xAxis_label.size)) {
                       xAxis_label.get(value.toInt())
                   } else {
                       "0"
                   }
               }
               xAxis.setCenterAxisLabels(true)
               val barSpace = 0.06f
               val groupSpace = 0.8f
               xAxis.axisMinimum = 0f
               xAxis.axisMaximum = 50f
   
   //            val yAxisLeft  = penetration_chart.axisLeft
   //            yAxisLeft.axisMinimum = 0f
   //            val yAxisRight = penetration_chart.axisRight
   //            yAxisRight.axisMinimum = 0f
               penetration_chart.setDrawGridBackground(false)
               val description = Description()
               description.text = ""
               penetration_chart.description = description
   
   
               barData.setBarWidth(0.5f)
   
               penetration_chart.groupBars(0f, groupSpace, barSpace)
   
               penetration_chart.getAxisRight().setDrawGridLines(false);
               penetration_chart.getAxisLeft().setDrawGridLines(false);
               penetration_chart.getXAxis().setDrawGridLines(false);
   
               penetration_chart.setVisibleXRangeMaximum(5f)
               penetration_chart.invalidate()
   
           }catch (e: Exception){
               e.printStackTrace()
           }
   

请帮忙。

Answer 1

这很有效，只需进行一些调整:

private fun populateCharts(chartData: List<ResponseGetPenetrationGrowth>){
        try {

            val prev_year = ArrayList<BarEntry>()
            val current_year = ArrayList<BarEntry>()
            val xAxis_label = ArrayList<String>()
            var i = 0f
            val currentYear = Calendar.getInstance().get(Calendar.YEAR)

            xAxis_label.add("")
            for (item in chartData!!) {
                xAxis_label.add(item.brand)
                prev_year.add(BarEntry(i,item.prevYear.toFloat()))
                current_year.add(BarEntry(i,item.currentYear.toFloat()))
                i++
            }
            xAxis_label.add("")

            val prevDataSet = BarDataSet(prev_year,(currentYear-1).toString())
            prevDataSet.setColors(ContextCompat.getColor(penetration_chart.context, R.color.prev_year_bar))
            prevDataSet.valueTextSize = 8f
            val currentDataSet = BarDataSet(current_year, currentYear.toString())
            currentDataSet.valueTextSize = 8f
            currentDataSet.setColors(ContextCompat.getColor(penetration_chart.context, R.color.current_year_bar))

            val barData = BarData(prevDataSet, currentDataSet)
            penetration_chart.data = barData
            barData.setBarWidth(0.3f)
            val xAxis = penetration_chart.getXAxis()

            xAxis.setPosition(XAxis.XAxisPosition.BOTTOM)
            xAxis.valueFormatter = IndexAxisValueFormatter(xAxis_label)
            xAxis.granularity= 1f
            xAxis.setCenterAxisLabels(true)


            val barSpace = 0.05f
            val groupSpace = 0.3f
            xAxis.axisMinimum = 1f
            xAxis.axisMaximum = xAxis_label.size - 1.1f


            penetration_chart.setDrawGridBackground(false)
            val description = Description()
            description.text = ""
            penetration_chart.description = description

            penetration_chart.groupBars(1f, groupSpace, barSpace)
            penetration_chart.getAxisRight().setDrawGridLines(false);
            penetration_chart.getAxisLeft().setDrawGridLines(false);
            penetration_chart.getXAxis().setDrawGridLines(false);

            val legend = penetration_chart.legend
            legend.position = Legend.LegendPosition.BELOW_CHART_CENTER
            penetration_chart.extraBottomOffset = 20f
            penetration_chart.setVisibleXRangeMaximum(5f)
            penetration_chart.invalidate()

        }catch (e: Exception){
            e.printStackTrace()
        }
    }