Re: [android-developers] Help XFermode

Erase is working as intended here. You are erasing the window's Canvas, which is shared by all the Views. If you want to erase to transparent you should make that View use a drawing cache (setDrawingCacheEnabled()) or a layer (setLayerType()) but this will come at a cost performance-wise. Another solution is to simply draw with your background color.

On Tue, May 28, 2013 at 8:43 PM, Tiago Braga <tbragamachado@gmail.com> wrote:

Hello!

I am starting the studies, and decide to make a little program to draw on a white canvas.

I rode one example of android called "FingerPaint" and I noticed something:
When I select the option "Erase", it uses the following method to clean up what is on the screen:

mPaint.setXfermode (new PorterDuffXfermode (PorterDuff.Mode.CLEAR));

It cleans up really, but while you're dragging the screen to clear, is appearing black lines.

How do I solve this?

--
Atenciosamente,
Tiago Braga Machado

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Romain Guy
Android framework engineer
romainguy@android.com

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