[移动开发]近段时间的学习碎片整理（17）

1、MPAndroidChart柱状图——BarChart使用

（1）布局文件

  <com.github.mikephil.charting.charts.BarChart
                android:id="@+id/bc_sleep_quality"
                android:layout_width="match_parent"
                android:layout_height="200dp"
                app:layout_constraintTop_toBottomOf="@id/tv_sleep_quality"
                android:layout_marginHorizontal="16dp"
                />

（2）设置初始值

binding.bcSleepQuality.apply {
            setDrawBarShadow(false)
            animateY(1000) //Y轴动画时间
            description.isEnabled = false
            xAxis.apply {
                position = XAxis.XAxisPosition.BOTTOM
                labelCount = 7
                textSize = 10f
                setDrawGridLines(false)
                axisMaximum = 8f
                axisMinimum = 0f
                xOffset = 1f
                textColor = ContextCompat.getColor(mContext!!, R.color.overview_text_information)
                this.valueFormatter = valueFormatter
            }
            axisLeft.apply {
                textSize = 10f
                gridColor = 0x00000000
                axisMinimum = 0f
                axisMaximum = 100f
                textColor = ContextCompat.getColor(mContext!!, R.color.overview_text_information)
            }
            axisRight.apply {
                isEnabled = false
                axisMinimum = 0f
            }
            setTouchEnabled(false)
            //设置是否可以缩放 x和y，默认true
            setScaleEnabled(false)
            //设置是否可以通过双击屏幕放大图表。默认是true
            isDoubleTapToZoomEnabled = false
            //图表背景颜色的设置
            setBackgroundResource(R.drawable.bg_chart)
        }

  val valueFormatter = object : ValueFormatter() {
            override fun getFormattedValue(value: Float): String {
                //转化一下数据
                return 
            }
        }

（3）将数据转化成BarEntry->BarDataSet->BarData 一个套娃过程，最后把bardata设置到barchart的data属性中即可

 private fun setSleepQualityToUI(list: MutableList<RoomSleepReport>) {
        val temp = mutableListOf<BarEntry>()
        for (roomSleepReport in list) {
            temp.add(
                BarEntry(
                    roomSleepReport.reportEndDay!!.toFloat(),
                    roomSleepReport.reportScore!!.toFloat()
                )
            )
        }
        val createBarData = createBarChartData(temp, false)
        if (binding.bcSleepQuality.data != null && binding.bcSleepQuality.data.dataSetCount > 0) {
            binding.bcSleepQuality.clearValues()
        }

        binding.bcSleepQuality.data = createBarData
        binding.bcSleepQuality.data.notifyDataChanged()
        binding.bcSleepQuality.notifyDataSetChanged()
    }
    private fun createBarChartData(temp: MutableList<BarEntry>, yellow: Boolean): BarData {
        val barDataSet = BarDataSet(temp, "")
        if (yellow) {
            barDataSet.color =
                ContextCompat.getColor(mContext!!, R.color.sleep_duration_barChart_color)
        } else {
            barDataSet.color =
                ContextCompat.getColor(mContext!!, R.color.sleep_quality_barChart_color)
        }
        val dataSets = arrayListOf<IBarDataSet>()
        dataSets.add(barDataSet)
        val barData = BarData(dataSets)
        barData.setValueTextSize(10f)
        barData.setValueTextColor(
            ContextCompat.getColor(
                mContext!!,
                R.color.overview_text_information
            )
        )
        return barData
    }