Custom Annotation Example Doesn't Work For Me

[Carmen]

annotation.setContentRenderer(new CustomTextRenderer()); 

This line gives me an error "error: cannot find symbol
        annotation.setContentRenderer(new CustomTextRenderer());"

From http://docs.telerik.com/devtools/android/controls/chart/chart-annotations

 

  

 

[Todor]

Hi Carmen,

Thank you for writing.

Please make sure you have followed the whole paragraph from the documentation, namely that you have an annotation variable of type CartesianCustomAnnotation:
​

CartesianCustomAnnotation annotation = new CartesianCustomAnnotation(verticalAxis, horizontalAxis, 6, "Feb", "TARGET");
chartView.getAnnotations().add(annotation);

Also, that you have your custom renderer defined:

public class CustomTextRenderer implements CustomAnnotationRenderer {
    Paint contentPaint = new Paint();

    public CustomTextRenderer() {
        contentPaint.setTextSize(36);
        contentPaint.setColor(Color.RED);
        contentPaint.setTypeface(Typeface.create("sans-serif-light", Typeface.NORMAL));
    }

    @Override
    public RadSize measureContent(Object content) {
        if (content == null) {
            return RadSize.getEmpty();
        }

        String text = content.toString();
        Rect textBounds = new Rect();
        contentPaint.getTextBounds(text, 0, text.length(), textBounds);

        return new RadSize(textBounds.width(), textBounds.height());
    }

    @Override
    public void render(Object content, RadRect layoutSlot, Canvas canvas, Paint paint) {
        if (content == null) {
            return;
        }

        String text = content.toString();
        canvas.drawText(
                text, (float) layoutSlot.getX() - (float) (layoutSlot.getWidth() / 2.0),
                (float) layoutSlot.getBottom() - (float)layoutSlot.getHeight() / 2, contentPaint);
    }
}

And only then, you will be able to set the renderer as shown:

annotation.setContentRenderer(new CustomTextRenderer());

Let us know if you need further assistance.


Regards,
Todor
Telerik