[AC-1607] backgroundColor animation starting from transparent doesn't work (android)

The following animation is supposed to obscure the main white view (with what's drawn on it) with a half-transparent black (I put a popup on top of the overlay). You should see the the white view getting darker until it's covered with half-black transparent. I use a backgroundColor animation instead of opacity because I put stuff on the overlay which I want to be opaque.

var view=Ti.UI.createView({top:0,bottom:0,backgroundColor:'white'});
...
var overlay=Ti.UI.createView({top:0,bottom:0,backgroundColor:'#0000'});
view.add(overlay);
overlay.animate({backgroundColor:'#8000',duration:150});

What happens is that when the animation starts, the overlay view comes up *black* (instead of transparent) and then becomes half transparent.