java - 我无法将 Java 完美地转换为 Kotlin

Question

我是 Kotlin 和 Java 的新手。

我一直在使用 Kotlin 构建 GPA 成绩计算器并在 Android Studio 上用图表显示它们。

我使用 hellochart 库。

我无法将示例从 java 转换为 kotlin。

这是我尝试使用的示例链接 https://www.codingdemos.com/draw-android-line-chart/ ？

    package com.codingdemos.codingdemos;
    import android.graphics.Color;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import java.util.ArrayList;
    import java.util.List;
    import lecho.lib.hellocharts.model.Axis;
    import lecho.lib.hellocharts.model.AxisValue;
    import lecho.lib.hellocharts.model.Line;
    import lecho.lib.hellocharts.model.LineChartData;
    import lecho.lib.hellocharts.model.PointValue;
    import lecho.lib.hellocharts.model.Viewport;
    import lecho.lib.hellocharts.view.LineChartView;
    public class MainActivity extends AppCompatActivity {
        LineChartView lineChartView;
    String[] axisData = {"Jan", "Feb", "Mar", "Apr", "May", "June", "July",
    "Aug", "Sept","Oct", "Nov", "Dec"};
    int[] yAxisData = {50, 20, 15, 30, 20, 60, 15, 40, 45, 10, 90, 18};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            lineChartView = findViewById(R.id.chart);
            List yAxisValues = new ArrayList();
            List axisValues = new ArrayList();

            Line line = new Line(yAxisValues).setColor(Color.parseColor("#9C27B0"));
    for (int i = 0; i < axisData.length; i++) {
            axisValues.add(i, new AxisValue(i).setLabel(axisData[i]));
        }

        for (int i = 0; i < yAxisData.length; i++) {
            yAxisValues.add(new PointValue(i, yAxisData[i]));
        }

        List lines = new ArrayList();
        lines.add(line);

        LineChartData data = new LineChartData();
        data.setLines(lines);

        Axis axis = new Axis();
        axis.setValues(axisValues);
        axis.setTextSize(16);
        axis.setTextColor(Color.parseColor("#03A9F4"));
        data.setAxisXBottom(axis);

        Axis yAxis = new Axis();
        yAxis.setName("Sales in millions");
        yAxis.setTextColor(Color.parseColor("#03A9F4"));
        yAxis.setTextSize(16);
        data.setAxisYLeft(yAxis);

        lineChartView.setLineChartData(data);
        Viewport viewport = new Viewport(lineChartView.getMaximumViewport());
        viewport.top = 110;
        lineChartView.setMaximumViewport(viewport);
        lineChartView.setCurrentViewport(viewport);
    }

}

请帮助我将它正确无误地转换为 Kotlin :(。 谢谢

Answer 1

试试这个代码..希望它对你有用

class MainActivity : AppCompatActivity() {
 private var axisData: Array<String> = arrayOf(
    "Jan",
    "Feb",
    "Mar",
    "Apr",
    "May",
    "June",
    "July",
    "Aug",
    "Sept",
    "Oct",
    "Nov",
    "Dec"
)
 private var yAxisData: IntArray = intArrayOf(50, 20, 15, 30, 20, 60, 15, 40, 45, 10, 90, 18)
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    val yAxisValues:ArrayList<PointValue> = ArrayList()
    val axisValues:ArrayList<AxisValue> = ArrayList()

    val line = Line(yAxisValues).setColor(Color.parseColor("#9C27B0"))
    for (i in axisData.indices) {
        axisValues.add(i, AxisValue(i.toFloat()).setLabel(axisData[i]))
    }

    for (i in yAxisData.indices) {
        yAxisValues.add(PointValue(i.toFloat(), yAxisData[i].toFloat()))
    }

    val lines:ArrayList<Line> = ArrayList()
    lines.add(line)

    val data = LineChartData()
    data.lines = lines

    val axis = Axis()
    axis.values = axisValues
    axis.textSize = 16
    axis.textColor = Color.parseColor("#03A9F4")
    data.axisXBottom = axis

    val yAxis = Axis()
    yAxis.name = "Sales in millions"
    yAxis.textColor = Color.parseColor("#03A9F4")
    yAxis.textSize = 16
    data.axisYLeft = yAxis

    chart.lineChartData = data
    val viewport = Viewport(chart.maximumViewport)
    viewport.top = 110f
    chart.maximumViewport = viewport
    chart.currentViewport = viewport
}
}