Scichart can't remove annotation

Question

When Im trying to remove an annotation, I’m receiving an error:

java.lang.NullPointerException: Attempt to invoke interface method ‘void com.scichart.charting.visuals.annotations.IAnnotationPlacementStrategy.drawAdorner(android.graphics.Canvas)’ on a null object reference at com.scichart.charting.visuals.annotations.AnnotationBase.onDrawAdorner(SourceFile:889) at com.scichart.charting.visuals.annotations.AdornerLayer.onDraw(SourceFile:144) at android.view.View.draw(View.java:17071) at android.view.View.updateDisplayListIfDirty(View.java:16053)

I’ve tried many ways, like:

UpdateSuspender.using(priceChart, new Runnable() {
    @Override
    public void run() {
        priceChart.getAnnotations().clear();
    }
});

and

UpdateSuspender.using(priceChart, new Runnable() {
    @Override
    public void run() {
        priceChart.getAnnotations().remove(myAnnotation);
    }
});

But I just can't remove it.

score 0 · Answer 1 · answered Jul 28 '17 at 22:52

0

That's weird. There's a SciChart Android Tutorial on Annotations here. It uses 'chart.getAnnotations().remove(0)'

The full source code for this tutorial can be found at the SciChart.Android.Examples Github repository.

Does it work for you?

answered Jul 28 '17 at 22:52

Dr. Andrew Burnett-Thompson

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score 0 · Accepted Answer · answered Aug 01 '17 at 17:50

this is the official answer from Scichart team:

Hi Marcos,

I want to notify you that I’ve investigated and fixed this issue. It was caused by a small bug in our code – when you remove annotation from chart it doesn’t remove adorner for annotation if it is selected. The fix will be available in our next nightly build and for now you can workaround this issue by unselecting annotation before removing from collection:

UpdateSuspender.using(priceChart, new Runnable() {
    @Override
    public void run() {
        myAnnotation.setSelected(false);
        priceChart.getAnnotations().remove(myAnnotation);
    }
});

Hope this will help you!

Best regards, Yura

Scichart can't remove annotation

2 Answers2