How to save User rating in flutter rating bar?

Question

Im trying to saving user rating to displaying it when user comes back to page. But im a lit struggling cannot figure out how to do this. Rating works but as I said the saving not . So what happens is that its always empty. What I actually want is that if user comes back to the page he see his rating and if he rate again and the rating is different the last rating I let him rating and if not then not and if he press clear the rating will be deleting what also works fine.

Maybe anyone can help.

lass Ratingpage extends StatefulWidget {
  final int maximumRating;
  final Function(int) onRatingSelected;

  Ratingpage(this.onRatingSelected, [this.maximumRating = 5]);

  @override
  _RatingpageState createState() => _RatingpageState();
}

class _RatingpageState extends State<Ratingpage> {
  int haveusercurrentchoice;

  int _currentRating = 0;

  Widget _buildRatingStar(int index) {
    if (index < _currentRating) {
      return Icon(
        Icons.star,
        color: Colors.yellow,
      );
    } else {
      return Icon(
        Icons.star,
        color: Colors.white,
      );
    }
  }

  Widget _buildBody() {
    final stars = List<Widget>.generate(this.widget.maximumRating, (index) {
      return Expanded(
        child: GestureDetector(
          child: _buildRatingStar(index),
          onTap: () {
            setState(() {
              _currentRating = index;
            });

            this.widget.onRatingSelected(_currentRating);
          },
        ),
      );
    });
    return Row(
      children: [
        Expanded(
          child: Row(
            children: stars,
          ),
        ),
        Expanded(
          child: TextButton(
            onPressed: () {
              setState(() {
                _currentRating = 0;
              });

              this.widget.onRatingSelected(_currentRating);
            },
            child: Text(
              "Clear",
              style: TextStyle(color: Colors.white),
            ),
          ),
        ),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return _buildBody();
  }

if you need more information please leave a comment.

This is how im calling the page

 Container(
                                width: 210,
                                height: 94,
                                //color: Colors.blue.withOpacity(0.5),
                                child: Column(
                                  children: [
                                    InkWell(
                                      onTap: () {
                                        setState(() {
                                          israting = true;
                                        });
                                        //  if( _rating !=null && _rating >0){
                                        // likevideo(videos.data()['id']);}
                                      },
                                      child: israting
                                          ? Container(
                                              height: 50,
                                              margin: EdgeInsets.fromLTRB(
                                                  0, 0, 5, 0),
                                              child: Column(
                                                children: [
                                                  Ratingpage((rating) {
                                                    setState(() {
                                                      _rating = rating;
                                                    });

                                                    if (_rating != null &&
                                                        _rating > 0) {
                                                      likevideo(
                                                          videos.data()['id'],
                                                          _rating);

                                                      print(delteuserchoicing);
                                                    } else if (_rating ==
                                                            null ||
                                                        _rating == 0) {
                                                      dislike(
                                                          videos.data()['id'],
                                                          _rating);
                                                    }
                                                  }),
                                                ],
                                              ),
                                            )
                                          : Icon(
                                              Icons.star,
                                              size: 37,
                                              color: videos
                                                      .data()['likes']
                                                      .contains(uid)
                                                  ? Colors.yellow
                                                  : Colors.white,
                                            ),
                                    ),

it is inside a column actually