CircleTransformation.equals

    public class CircleTransformation extends BitmapTransformation {

        @Override
        public boolean equals(Object obj) {
            if (obj instanceof BlurTransformation) {
                return this == obj;
            }
            return false;
        }
    }

 if (obj instanceof BlurTransformation) 写错了吧，应该是 if (obj instanceof CircleTransformation) 
