android - 将数据从 csv 文件传递到折线图

问题描述

我有一个 MPAndroidChart 库中的折线图，我希望使用 scv 文件中的数据更新它的数据。有人可以教我怎么做，或者给我看一个我可以做的图书馆。我是初学者，我不知道如何去做

我在这里制作图表的页面

我的 MainActivity.kt

    package com.example.aplikacjadlataty

import android.content.Intent
import android.graphics.Color
import android.os.Bundle
import android.util.Log
import android.widget.Button
import android.widget.Switch
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import com.github.mikephil.charting.animation.Easing
import com.github.mikephil.charting.charts.LineChart
import com.github.mikephil.charting.data.Entry
import com.github.mikephil.charting.data.LineData
import com.github.mikephil.charting.data.LineDataSet
import com.google.android.gms.ads.MobileAds
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)


//1
        val button = findViewById<Button>(R.id.button_loadCsv)
        val text = findViewById<TextView>(R.id.text)

        val sw1 = findViewById<Switch>(R.id.switch1)
        sw1?.setOnCheckedChangeListener { _, isChecked ->
            if (isChecked) screen.setBackgroundColor(Color.DKGRAY)
            else screen.setBackgroundColor(Color.WHITE)

            if (isChecked) layout.setBackgroundColor(Color.DKGRAY)
            else layout.setBackgroundColor(Color.WHITE)

            if (isChecked) AdsLayout.setBackgroundColor(Color.DKGRAY)
            else AdsLayout.setBackgroundColor(Color.WHITE)

            if (isChecked) text.text = "Set light mode"
            else text.text = "Set dark mode"
            if (isChecked) text.setTextColor(Color.WHITE)
            else text.setTextColor(Color.BLACK)

            if (isChecked) button.setTextColor(Color.WHITE)
            else button.setTextColor(Color.BLACK)
            if (isChecked) button.setBackgroundColor(R.color.DGray)
            else button.setBackgroundColor(R.color.LGray)
        }






//2
        Log.d(
            "MainActivity", "onCreate Called \n" +
                    "                                                                                                                    \n" +
                    "                                                                                                                    \n" +
                    "                                                                                                                    \n" +
                    "    __  ___    ___     __ __   _____          ______    __  __   ____        __    _   __    ____    ___     __ __  \n" +
                    "   /  |/  /   /   |   / //_/  / ___/         / ____/   / / / /  / __ \\      / /   / | / /   /  _/   /   |   / //_/ \n" +
                    "  / /|_/ /   / /| |  / ,<     \\__ \\         / /       / /_/ /  / / / / __  / /   /  |/ /    / /    / /| |  / ,<   \n" +
                    " / /  / /   / ___ | / /| |   ___/ /        / /___    / __  /  / /_/ / / /_/ /   / /|  /   _/ /    / ___ | / /| |    \n" +
                    "/_/  /_/   /_/  |_|/_/ |_|  /____/         \\____/   /_/ /_/   \\____/  \\____/   /_/ |_/   /___/   /_/  |_|/_/ |_| \n" +
                    "                                                                                                                    \n" +
                    "                                                                                                                    \n" +
                    "                                                                                                                      "
        )






//3
        MobileAds.initialize(this) {}






//4
        val lineChart = findViewById<LineChart>(R.id.lineChart)

        val entries = ArrayList<Entry>()

        entries.add(Entry(1f, 3.4121f))
        entries.add(Entry(2f, 3.8195f))
        entries.add(Entry(3f, 3.8253f))
        entries.add(Entry(4f, 3.9150f))
        entries.add(Entry(5f, 4f))
        entries.add(Entry(6f, 3.5252f))
        entries.add(Entry(7f, 3.8956f))
        entries.add(Entry(8f, 3.8561f))
        entries.add(Entry(9f, 4.0200f))
        entries.add(Entry(10f, 3.0392f))
        entries.add(Entry(11f, 3.0420f))
        entries.add(Entry(12f, 3.5034f))
        entries.add(Entry(13f, 4.3270f))
        entries.add(Entry(14f, 4.6201f))
        entries.add(Entry(15f, 3.9295f))
        entries.add(Entry(16f, 3.7232f))
        entries.add(Entry(17f, 3.0725f))
        entries.add(Entry(18f, 3.5252f))
        entries.add(Entry(19f, 4.0371f))
        entries.add(Entry(20f, 3.5252f))
        entries.add(Entry(21f, 4.1403f))
        entries.add(Entry(22f, 4.4237f))
        entries.add(Entry(23f, 3.8392f))
        entries.add(Entry(24f, 3.5252f))

        val vl = LineDataSet(entries, "USD/PLN")

        vl.setDrawValues(false)
        vl.setDrawFilled(true)
        vl.lineWidth = 3f
        vl.fillColor = R.color.gray
        vl.fillAlpha = R.color.red

        lineChart.xAxis.labelRotationAngle = 0f

        lineChart.data = LineData(vl)

        lineChart.axisRight.isEnabled = false
        lineChart.xAxis.axisMaximum = 24 + 0.1f

        lineChart.setTouchEnabled(true)
        lineChart.setPinchZoom(true)

        lineChart.description.text = "Hour"
        lineChart.setNoDataText("No forex yet!")

        lineChart.animateX(1800, Easing.EaseInExpo)

        val markerView = CustomMarker(this@MainActivity, R.layout.marker_view)
        lineChart.marker = markerView







//5  p1
        findViewById<Button>(R.id.button_loadCsv)?.setOnClickListener {
            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
            intent.addCategory(Intent.CATEGORY_OPENABLE)
            intent.type = "text/*"
            startActivityForResult(intent, READ_REQUEST_CODE)
        }
    }

//5  p2
    companion object {
        const val READ_REQUEST_CODE = 123
    }
}

.csv 文件

标签： androidcsvkotlinchartsmpandroidchart

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