Xamarin.android 的 MpAndroidChart

Question

我正在为我的应用程序使用 MpAndroidChart。我可以成功创建饼图，但我有一个问题。我想要一个事件侦听器来处理当用户触摸其中一个饼图时单击的项目 item.How 我可以吗？

我的代码如下；

>

int[] ydata = { 5, 2, 3, 1 }; string[] xdata= { "one","two","three","four" };

PieChart pieChart;

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);

    // Set our view from the "main" layout resource
    SetContentView(Resource.Layout.Main);

    pieChart = FindViewById<PieChart>(Resource.Id.chart1);

    pieChart.RotationEnabled = true;
    pieChart.HoleRadius = 0;
    pieChart.SetTransparentCircleAlpha(0);
    pieChart.SetCenterTextSize(20);
    pieChart.SetDrawEntryLabels(true);
    pieChart.SetUsePercentValues(false);

    pieChart.AnimateX(1000, Easing.EasingOption.EaseInOutCubic);

    pieChart.Description.Text = "test";
    addDataSet();
    pieChart.SetTouchEnabled(true);

}

private void addDataSet()
{
    List<PieEntry> yEntry = new List<PieEntry>();
    List<string> xEntry = new List<string>();

    for (int i = 0; i < ydata.Length; i++)
    {
        yEntry.Add(new PieEntry(ydata[i],xdata[i]));
    }
    for (int i = 0; i < xdata.Length; i++)
    {
        xEntry.Add(xdata[i]);
    }

    PieDataSet piedataset = new PieDataSet(yEntry, "test");

    piedataset.SliceSpace = 0;
    piedataset.ValueTextSize = 20;

    int[] colors= { Color.Blue,Color.Red,Color.Green,Color.White}; 

    piedataset.SetColors(colors);

    Legend legend = pieChart.Legend;

    legend.Form=Legend.LegendForm.Circle;

    PieData pieData = new PieData(piedataset);
    //pieData.SetValueFormatter(new int);

    pieData.SetValueTextColor(Color.White);
    pieChart.Data = (pieData);

    pieChart.Invalidate();
}

Answer 1

您可以使用 SetOnChartValueSelectedListener 设置 ChartValueSelectedListener。

例如在onCreate()中：

pieChart.SetOnChartValueSelectedListener(new MyListener(this));

听众：

public class MyListener : Java.Lang.Object, IOnChartValueSelectedListenerSupport
{
    Context mContext;
    public MyListener(Context context) {
        this.mContext = context;
    }
    public void OnNothingSelected()
    {
       // throw new NotImplementedException();
    }

    public void OnValueSelected(Entry e, Highlight h)
    {
        PieEntry pe = (PieEntry)e;
        Toast.MakeText(mContext, pe.Label+ " is clicked, value is "+ pe.Value, ToastLength.Short).Show();
    }
}

结果是：

Xamarin.android 的 MpAndroidChart

MpAndroidChart for Xamarin.android

xamarin.android

mpandroidchart