Code example for RadialGradient

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            int green = (int)(100 + Math.random() * 155);
            int blue = (int)(100 + Math.random() * 155);
            int color = 0xff000000 | red << 16 | green << 8 | blue;
            Paint paint = drawable.getPaint();
            int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
            RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
                    50f, color, darkColor, Shader.TileMode.CLAMP);
            paint.setShader(gradient);
            shapeHolder.setPaint(paint);
            balls.add(shapeHolder);
            return shapeHolder;
        } 
 
        @Override 
        protected void onDraw(Canvas canvas) {
            for (ShapeHolder ball : balls) {
                canvas.translate(ball.getX(), ball.getY());
                ball.getShape().draw(canvas);
                canvas.translate(-ball.getX(), -ball.getY());
            } 
        }