MpAndroidChart for Xamarin.android - xamarin.android

Question

I'm using MpAndroidChart for my app. I can create piechart successfully but I have a question. I want an event listener to handle item clicked when user touched one of piechart item.How can I do it?
My Code is as below;
>
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

You could use SetOnChartValueSelectedListener to set a ChartValueSelectedListener.
For example, in onCreate():
pieChart.SetOnChartValueSelectedListener(new MyListener(this));
And the listener:
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();
}
}
The result is: