Re: [android-developers] How to set the bitmap to Transparent

First, you should use ARGB_8888... ARGB_4444 is deprecated:
http://developer.android.com/reference/android/graphics/Bitmap.Config.html

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 Developer
http://sites.google.com/site/magouyaware

On Mon, Apr 2, 2012 at 9:54 AM, Perry <perrypkk@gmail.com> 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!

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