使用 MpAndroidChart 在折线图上使用 2 种类型的数据时如何清除实际图表数据

如何解决使用 MpAndroidChart 在折线图上使用 2 种类型的数据时如何清除实际图表数据

我正在尝试使用带有 2 个按钮的 MpAndroidChart 库创建折线图。单击第一个按钮时，图表将显示 3 天的数据，单击第二个按钮时，图表将显示 7 天的数据，但是当我按下第二个按钮时，新数据会添加到旧数据之上。 我试图清除传递给 LineDataSet 的数组，试图清除（）图表，但每次出现错误时。 我有 2 个不同的函数来在图表上显示 2 条不同的线。如果您有任何建议，请告诉我如何解决。

设置第一类数据的函数：

private fun setCashData(cashList: MutableList<CashCollection.CashCollectionItem>,daysNmb: Int) {
    val dataCashEntries: ArrayList<Entry> = arrayListOf()
    val dateArrayList: ArrayList<String> = arrayListOf()
    val reverseCashList: MutableList<CashCollection.CashCollectionItem> = arrayListOf()
    var i = 0F
    val listIterator = cashList.listIterator()
    while (listIterator.hasNext()) listIterator.next()
    while (listIterator.hasPrevious()) reverseCashList.add(listIterator.previous())

    for (item in reverseCashList) {
        if (i <= daysNmb) {
            var cashValue: String = item.value!!.replaceFirst(",",".")
            var date: String = item.label!!.replace(".2020","")
            if (cashValue.toFloat() != 0F) {
                dataCashEntries.add(Entry(i,cashValue.toFloat()))
                dateArrayList.add(date)
                i++
            }
        }
    }
    var lineDataSet1 = LineDataSet(dataCashEntries,"Cash Collection")
    lineDataSet1.setCircleColor(getChartsColors()[0])
    lineDataSet1.color = getChartsColors()[0]
    lineDataSet1.circleSize = 5f
    lineDataSet1.lineWidth = 3f
    lineDataSet1.fillAlpha = 160
    lineDataSet1.setDrawFilled(true)
    lineDataSet1.fillColor = getChartsColors()[0]
    lineData.addDataSet(lineDataSet1)
    lineData.setValueTextSize(10f)
    line_chart_details.data = lineData
    line_chart_details.description.isEnabled = false
    val xAxis = line_chart_details.xAxis
    val yAxisRight = line_chart_details.axisRight
    val yAxisLeft = line_chart_details.axisLeft
    yAxisRight.isEnabled = false
    yAxisLeft.isEnabled = true
    yAxisLeft.setDrawLabels(true)
    yAxisLeft.setDrawGridLines(true)
    xAxis.position = XAxis.XAxisPosition.BOTTOM
    xAxis.isEnabled = true
    line_chart_details.xAxis.valueFormatter = IndexAxisValueFormatter(dateArrayList)
    //line_chart.xAxis.mAxisRange = barLabesArrayList.size.toFloat()
    line_chart_details.isClickable = false
    line_chart_details.isHighlightPerTapEnabled = false
    line_chart_details.onTouchListener = null
    line_chart_details.legend.isEnabled = true
    line_chart_details.animateY(2000)
    line_chart_details.invalidate()
    line_chart_details.clear();
}

设置第二种数据的函数

private fun setFinancialData(financialList: MutableList<FinancialDetails.FinancialDetailsItem>,daysNmb: Int) {
    val dataFinancialEntries: ArrayList<Entry> = ArrayList()
    val reverseFinancialList: MutableList<FinancialDetails.FinancialDetailsItem> = ArrayList()
    var i = 0F
    val listIterator = financialList.listIterator()

    while (listIterator.hasNext()) listIterator.next()
    while (listIterator.hasPrevious()) reverseFinancialList.add(listIterator.previous())

    for (item in reverseFinancialList) {
        if (i <= daysNmb) {
            val value: String = item.value!!.replaceFirst(",".")
            if (value.toFloat() != 0F) {
                dataFinancialEntries.add(Entry(i,value.toFloat()))
                i++
            }
        }
    }

    var lineDataSet2 = LineDataSet(dataFinancialEntries,"Financial Details")
    lineDataSet2.setCircleColor(getChartsColors()[1])
    lineDataSet2.color = getChartsColors()[1]
    lineDataSet2.circleSize = 5f
    lineDataSet2.lineWidth = 2f
    lineDataSet2.fillAlpha = 160
    lineDataSet2.setDrawFilled(true)
    lineDataSet2.fillColor = getChartsColors()[1]

    lineData.addDataSet(lineDataSet2)
    lineData.setValueTextSize(10f)
    line_chart_details.data = lineData
    line_chart_details.description.isEnabled = false
    val xAxis = line_chart_details.xAxis
    val yAxisRight = line_chart_details.axisRight
    val yAxisLeft = line_chart_details.axisLeft
    yAxisRight.isEnabled = false
    yAxisLeft.isEnabled = true
    yAxisLeft.setDrawLabels(true)
    yAxisLeft.setDrawGridLines(true)
    xAxis.position = XAxis.XAxisPosition.BOTTOM
    xAxis.isEnabled = true
    line_chart_details.isClickable = false
    line_chart_details.isHighlightPerTapEnabled = false
    line_chart_details.onTouchListener = null
    line_chart_details.legend.isEnabled = true
    line_chart_details.animateY(2000)
    line_chart_details.invalidate()
}

按钮代码：

last_days_money_button.setOnClickListener {
        last_days_money_button.isSelected = !last_days_money_button.isSelected
        last_week_money_button.isSelected = !last_week_money_button.isSelected
        financialDetailsObserverDays()
        cashCollectionObserverDays()
    }
    last_week_money_button.setOnClickListener {
        last_week_money_button.isSelected = !last_week_money_button.isSelected
        last_days_money_button.isSelected = !last_days_money_button.isSelected
        financialDetailsObserverWeek()
        cashCollectionObserverWeek()