How to draw in a UIView? UIGraphics.getCurrentContext return null

[Yi-Chun Kuo]

I try to draw a circle in a UIView. I subclass UIView as MyUIView and override "draw" function as what to do in objC. 

public class MyUIView extends UIView{

     public MyUIView(CGRect rect){

          super(rect);

      }

@Override

public void draw(CGRect rect){

      super.draw(rect);

      CGContext mCGContext = UIGraphics.getCurrentContext();

      mCGContext.setStrokeColor(UIColor.black().getCGColor());

      mCGContext.addArc(100.0, 20.0,15.0, 0.0, 2 * 3.14, 1);

      }

}

However, it has error that mCGContext is null.  I didn't have experience in iOS development. I follow how to draw in a UIView using objC here https://mikebluestein.wordpress.com/2010/02/21/drawing-with-coregraphics-in-monotouch-2/, but it seems it is not equivalent to robovm. 

  

[Yi-Chun Kuo]

  By the way, I refer to the TilingView.java in PhotoScroller of robovm sample. It also use  UIGraphics.getCurrentContext(), but I can't figure out why its currentcontext has value.

[Paul Franceus]

Are you calling draw directly yourself, or are you calling setNeedsDisplay() on the view?

On Sat, Apr 4, 2015 at 6:28 AM, Yi-Chun Kuo <kuoyic...@gmail.com> wrote:

  By the way, I refer to the TilingView.java in PhotoScroller of robovm sample. It also use  UIGraphics.getCurrentContext(), but I can't figure out why its currentcontext has value.

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