java数据显示的好看点_仅在选定的数据点上显示数据点？

我正在使用GraphView库(http://www.android-graphview.org/legend/)来构建我的图表 . 我的图表中有一个监听器，而purporse是在开始时以零数据点开始 . 我想点击图表中的特定位置，从我点击的位置显示数据点图标 .

我的例子：

我想要的例子：

这是我的代码：

class MainActivity : AppCompatActivity() {

lateinit var series:LineGraphSeries

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

val series = LineGraphSeries(

arrayOf(

DataPoint(9.0, 9.0),

DataPoint(10.0, 10.0),

DataPoint(11.0, 11.0),

DataPoint(12.0, 12.0),

DataPoint(13.0, 13.0),

DataPoint(14.0, 14.0)))

graph.addSeries(series)

var staticLabelsFormatter = StaticLabelsFormatter(graph)

staticLabelsFormatter.setHorizontalLabels(arrayOf("2018", "2019", "2020","2021","2022","2023"))

graph.viewport.isScrollable = true

graph.gridLabelRenderer.gridStyle = GridLabelRenderer.GridStyle.NONE

graph.gridLabelRenderer.isVerticalLabelsVisible = false

graph.gridLabelRenderer.labelFormatter = staticLabelsFormatter

series.color = Color.BLACK

series.thickness = 6

series.isDrawBackground = true

series.isDrawDataPoints = true

series.isDrawDataPoints = false

series.backgroundColor = Color.parseColor("#0D000000")

series.setOnDataPointTapListener { series, dataPoint ->

Toast.makeText(

applicationContext,

"Series1: On Data Point clicked: $dataPoint",

Toast.LENGTH_SHORT

).show()

}

}

}