如何使用 Provider 请求或更新服务器？ #Dart #Flutter

如何解决如何使用 Provider 请求或更新服务器？ #Dart #Flutter

向整个社区问好；当我发帖时，我会寻求您的帮助以从提要中获取更新；在这种情况下，具体来说，我有一个社交网络的代码，其中使用 Provider，我想传递一个小部件，包括给一个帖子的喜欢的初始和未来数据。当显示应用程序的时间线时，每个帖子都会正确读取到该时刻收到的点赞数，我的问题是如果我点赞帖子，我可以将数据上传到服务器（getStream），但我不一旦上传喜欢的内容，不知道如何在小部件中更新它。代码如下：

这是我要更新的小部件：

class LikesCommentsShareIcons extends StatefulWidget {
  final Activity activity;

  const LikesCommentsShareIcons({Key key,this.activity}) : super(key: key);
  @override
  _LikesCommentsShareIconsState createState() => _LikesCommentsShareIconsState();
}

class _LikesCommentsShareIconsState extends State<LikesCommentsShareIcons> {
  bool click = false;
  int likes;
  int comments;
  @override
  Widget build(BuildContext context) {
    final activityProvider = Provider.of<ActivityProvider>(context);
    int likes = activityProvider.likes;
    int comments = activityProvider.comments;

    Color color = click ? Theme.of(context).colorScheme.tomatoRed : Theme.of(context).primaryColor;
    return Consumer<ActivityProvider>(
        key: widget.key,builder: (context,notifier,_) {
          return Column(
            children: [
              ReactionCounters(
                activity: activityProvider.activity,color: color,likes: '$likes',comments: '$comments',),const Divider(
                color: Colors.black54,height: 5,Padding(
                padding: const EdgeInsets.symmetric(vertical: 10),child: Row(
                  crossAxisAlignment: CrossAxisAlignment.center,mainAxisAlignment: MainAxisAlignment.spaceAround,children: [
                    GestureDetector(
                        onTap: () async {
                          if (click == false) {
                            click = true;
                            await FeedService.postReaction(context,kind: 'like',activityId: widget.activity.id);
                          } else if (click == true) {
                            click = false;
                            
                          }

                          setState(() {});
                        },child: !click
                            ? FadeInDown(
                                duration: const Duration(milliseconds: 500),from: 1,child: const Icon(
                                  CupertinoIcons.heart,)
                            : ElasticIn(
                                duration: const Duration(milliseconds: 500),//from: 5,child: Icon(
                                  CupertinoIcons.heart_solid,color: Theme.of(context).colorScheme.tomatoRed,)),GestureDetector(onTap: () {},child: const Icon(CupertinoIcons.chat_bubble)),const Icon(CupertinoIcons.paperplane),],CommentList(
                comments: widget.activity.latestReactions['comment'],activityId: widget.activity.id,)
            ],);
        });
  }
}

所以我有我的 Provider 类，它导入一个名为 Activity 的模型：

class ActivityProvider with ChangeNotifier {
  Activity activity;
  int comments;
  int likes;
  int dislike;

  ActivityProvider(this.activity) {
    comments = activity.reactionCounts['comment'] ?? 0;
    likes = activity.reactionCounts['like'] ?? 0;
    dislike = activity.reactionCounts['dislike'] ?? 0;
  }

  Activity get activityProvider => this.activity;

  set activityProvider(Activity activityProvider) {
    activityProvider = activity;
    notifyListeners();
  }

我是这样实现的：

class ActivityContainer extends StatelessWidget {
  final Activity activity;

  ActivityContainer({@required this.activity});

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider<ActivityProvider>(create: (_) => new ActivityProvider(activity)),child: FeedsCardModel(
          child: Column(
        children: [
          ActivityContent(
            activity: activity,);
  }
}

class ActivityContent extends StatelessWidget {
  final Activity activity;

  ActivityContent({@required this.activity});

  @override
  Widget build(BuildContext context) {
    final type = activity.type;
    //final subType = activity.subType;

    return SingleTextPostCard(
      activity: activity,);
  }
}

我会感谢您帮助解决这些问题，并且仍在学习 Flutter。