Android Register Touch Events On Visible Portion Of Image?

I've currently been thinking about how I could register only touch events on the visible (non-transparent) parts of a .PNG image. -I've been testing around with AndEngine and it se

Solution 1:

One simple way to do it would be to grab the the pixel color at the touch location. Then you can check if the pixel is transparent:

intcolor= Bitmap.getPixel(x,y); // x and y are the location of the touch event in Bitmap spaceintalpha= Color.getAlpha(color);
booleanisTransparent= (alpha==0);

Note: Depending on how you implement your touch listener will might need to convert the x,y location of the touch event to the x,y coordinates of the image view.