How to make Canvas draw area transparent in android?

Question

I would like to make Canvas area transparent because I would like to add an Image behind it so that Canvas actions happen above the image.My code for the canvas is here

Answer 1

You can create a Bitmap of the same size as the canvas. Erase all the colors of the bitmap using Color.TRANSPARENCY and set it as a canvas bitmap:

Bitmap transparentBitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(),
Bitmap.Config.ARGB_8888);
transparentBitmap.eraseColor(Color.TRANSPARENT);
canvas.setBitmap(transparentBitmap);