Android Mask bitmap on canvas gen a black space

Question

I have a mask bitmap with a half is red color and ones is transparent like this https://www.dropbox.com/s/931ixef6myzusi0/s_2.png

I want to use mask bitmap to draw c

Answer 1

I encountered the same problem in my custom view and instead of decoding the bitmap from a resource, I had created the original bitmap and the masking bitmap from the scratch via canvas.draw*() methods (since both the original and mask are basic shapes). I was getting the blank opaque space instead of a transparent one. I fixed it by setting a hardware layer to my view.

View.setLayerType(LAYER_TYPE_HARDWARE, paint);

More info on why this is to be done here: https://stackoverflow.com/a/33483016/4747587