Bullet example

int _current;

List<Widget> items = [
    GoalStep1(),
    GoalStep2(),
    GoalStep3(),
    GoalStep4(),
    GoalStep5()
  ];

Positioned(
                 bottom: 16.0,
                 left: 0.0,
                 right: 0.0,
                 child: Row(
                     mainAxisAlignment: MainAxisAlignment.center,
                     children: items.map((index) {
                       return Container(
                         width: 8.0,
                         height: 8.0,
                         margin: EdgeInsets.symmetric(
                             vertical: 10.0, horizontal: 5.0),
                         decoration: BoxDecoration(
                             shape: BoxShape.circle,
                             border: Border.all(color: Color.fromRGBO(57, 60, 79, 1.0)),
                             color: _current == items.indexOf(index)
                                 ? Color.fromRGBO(57, 60, 79, 1.0)
                                 : Color.fromRGBO(255, 255, 255, 1.0)),
                       );
                     }).toList()),
               )