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 <[email protected]>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 > > -- > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Android Developers" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- Romain Guy Android framework engineer [email protected] -- -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
