I'm using Google Maps v2 API for android and I don't manage to control the transparency of the fillColor. I would like to be able to see the map under a filled polygon. Is there a way to do that ?
Thanks for any help !
Well, let me describe how standard 4 bytes color is encoded:
Standard pixel color consists of 4 bytes:
Each channel represents the saturation of particular color part. So if we need to create fully opaque red color, we need to specify following channel values:
If we want to make it half-transparent, we need to divide alpha channel value by 2 (255/2 = 127):
So let's go back to the android. In Android in most cases you can specify color by specifying it's hex value:
polygon.setFillColor(0xFF00FF00); //not transparent green color
In hex every channel can be specified by 2 hex digits:
If you want to make this color half-transparent, you need to divide FF
by 2:
0xFF/2 = 0x7F //the same as 255/2 = 127
polygon.setFillColor(0x7F00FF00); //half-transparent green color
So basically what you need to do - is to play with alpha channel value in order to get transparency you are looking for
cir=map.addCircle(new CircleOptions().center(new LatLng(10.938341, 76.9548734))
.radius(150)
.strokeColor(Color.rgb(0, 50, 100))
.strokeWidth(5)
.fillColor(Color.argb(20, 50, 0, 255))
.zIndex(55));
cir.setVisible(true);
Basically what worked for Me is :
polygon = mGoogleMap.addPolygon(new PolygonOptions().
addAll(points)
.fillColor(0x33FF0000)
.strokeColor(Color.RED)
.strokeWidth(3))
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