Android Hexagon形状按钮，具有六边形触摸边界

I want to create a hexagon shape button in android so that it's touch area does not overlaps (on the right) ie.I want heaxagon touch bound not a rectangle touch bound. I tried to use image view but it does not excludes tranparent(shown in blue, left). Is there any clickable object which is defined by xml shape/path. please can anyone show me xml shape/path part for just one button if its possible or any other method.I want to create a hexagon shape button in andr