I can create rectangle for creating wall for example:
final Rectangle wall = new Rectangle(CAMERA_WIDTH-2, 0, 2, CAMERA_HEIGHT -2);
PhysicsFactory.createBoxBody(this.physicsWorld, wall, BodyType.StaticBody, FIXTURE_DEF);
scene.attachChild(wall);
But i wanna create circle? for example ball.it should be body of box2d like above.