Hi Justin, I success now! Thank you for your solution. I fault as before because I had a foolish mistake. Thanks again!.
MagouyaWare於 2012年4月3日星期二UTC+8上午12時42分52秒寫道： > Are you sure that it is the bitmap that has the black background? How are > you using the bitmap? Is it the background or foreground of an ImageView? > > Thanks, > Justin Anderson > MagouyaWare Developer > http://sites.google.com/site/magouyaware > > > On Mon, Apr 2, 2012 at 10:33 AM, Perry <[email protected]> wrote: > >> hi, >> thank you for help. but the background still black. >> >> On 4月3日, 上午12時05分, Justin Anderson <[email protected]> wrote: >> > First, you should use ARGB_8888... ARGB_4444 is deprecated: >> http://developer.android.com/reference/android/graphics/Bitmap.Config... >> > >> > Next, here is how to do it: >> > >> > temp = Bitmap.createBitmap(thisWidth, thisHeight, Config.ARGB_8888); >> > >> > //Clear the canvas >> > Canvas canvas = new Canvas(temp); >> > >> > Paint transPainter = new Paint(); >> > transPainter.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); >> > >> > canvas.DrawRect(0, 0, temp.Width, temp.Height, transPainter); >> > >> > Hope that helps... >> > >> > Thanks, >> > Justin Anderson >> > MagouyaWare Developerhttp://sites.google.com/site/magouyaware >> > >> > >> > >> > On Mon, Apr 2, 2012 at 9:54 AM, Perry <[email protected]> wrote: >> > > hi, >> > >> > > I used following method to create a canvas. >> > >> > > temp = Bitmap.createBitmap(thisWidth, thisHeight, Config.ARGB_4444); >> > > Canvas thisCanvas = new Canvas(temp); >> > >> > > I don't know why the canvas has a black background. How to create a >> > > Transparent background for use? >> > >> > > Thanks a lot! >> > >> > > -- >> > > 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 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 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
