Questions

I tried to create a simple pie chart, but my app crashes with the following expection:

java.lang.NullPointerException: Attempt to invoke virtual method 'void com.scichart.drawing.common.FontStyle.initPaint(android.graphics.Paint)' on a null object reference
    at com.scichart.charting.visuals.renderableSeries.PieDonutDrawingManagerBase.a(SourceFile:118)
    at com.scichart.charting.visuals.renderableSeries.PieDonutDrawingManagerBase.drawLabels(SourceFile:110)
    at com.scichart.charting.visuals.renderableSeries.PieRenderableSeries.internalDraw(SourceFile:70)
    at com.scichart.charting.visuals.renderableSeries.PieDonutRenderableSeriesBase.onDraw(SourceFile:560)
    at com.scichart.charting.visuals.c.onDraw(SourceFile:62)
    at android.view.View.draw(View.java:16178)

Here is my initialization code (Kotlin):

override fun onViewCreated(view: View, savedInstanceState: Bundle?)
{
    super.onViewCreated(view, savedInstanceState)

    val chartSurface = view.findViewById(R.id.chart)
    val builder = SciChartBuilder.instance()

    val pieSeries = builder
        .newPieSeries()
        .withSegments(builder
                          .newPieSegment()
                          .withValue(40.0)
                          .build(),
                      builder
                          .newPieSegment()
                          .withValue(20.0)
                          .build())
        .build()

    chartSurface.renderableSeries.add(pieSeries)
}

The SciPieChartSurface is inside a CardView inside a Constraintlayout if that could matter:

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">   

    <android.support.v7.widget.CardView
        android:id="@+id/card_chart"
       android:layout_width="match_parent"
       android:layout_height="match_parent" >

        <com.scichart.charting.visuals.SciPieChartSurface
            android:id="@+id/chart"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </android.support.v7.widget.CardView>
</android.support.constraint.ConstraintLayout>