Flutter：将值通知程序数据上传到 Firebase

问题描述

Heloo，我一直在尝试将我的 ValueNotifier 数据上传到 firebase，每当我这样做时，它都会为我拥有 .copyWith

的通知程序的值返回空值

这是我在做什么：

    final recentNews = useProvider(allNewsProvider);
    final allactivities = useProvider(allActivitiesProvider);
    final _activity = useState(ActivitiesModel());
    String imageUrl;
    var pickedImage;
    var uuid = Uuid();
    final _formKey = useState(GlobalKey<FormState>());
    final currentOrganization = useProvider(currentOrganizationProvider);
    return Scaffold(
//the whole body with ui design
);
      floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,floatingActionButton: userRole == "Organization"
          ? currentOrganization.when(
              data: (org) => FloatingActionButton(
                    child: Icon(Icons.add),onpressed: () async {
                      await showDialog(
                          context: context,builder: (BuildContext context) {
                            return Dialog(
                              shape: RoundedRectangleBorder(
                                  borderRadius: BorderRadius.circular(15)),child: SingleChildScrollView(
                                  child: Form(
                                key: _formKey.value,child: Column(
                                  crossAxisAlignment: CrossAxisAlignment.center,children: <Widget>[
                                    Row(
                                      mainAxisAlignment:
                                          MainAxisAlignment.spaceEvenly,crossAxisAlignment:
                                          CrossAxisAlignment.center,children: <Widget>[
                                        CustomText(
                                          text: "Add an Activity",size: 22,),Icon(Icons.post_add)
                                      ],Field(
                                      label: "Title",iconData: Icons.title,validator: requiredValidator(
                                          errorText:
                                              "This field can't be empty"),onChanged: (value) => _activity.value =
                                          _activity.value
                                              .copyWith(title: value),SizedBox(
                                      height: 5,Field(
                                      label: "Description of Activity",iconData: Icons.description,onChanged: (value) => _activity.value =
                                          _activity.value
                                              .copyWith(description: value),Align(
                                      alignment: Alignment.center,child: TextButton(
                                        child: Icon(Icons.camera),onpressed: () async {
                                          String imageid = uuid.v4();
                                          pickedImage = await ImagePicker()
                                              .getimage(
                                                  source: ImageSource.gallery,maxWidth: 1920,maxHeight: 1200,imageQuality: 80);
                                          Reference reference = FirebaseStorage
                                              .instance
                                              .ref()
                                              .child("$imageid");
                                          UploadTask uploadTask = reference
                                              .putFile(File(pickedImage.path));
                                          await uploadTask.then((res) async {
                                            imageUrl = await reference
                                                .getDownloadURL();
                                          });
                                          _activity.value = _activity.value
                                              .copyWith(picture: imageUrl);
                                        },GestureDetector(
                                      onTap: () async {
                                       _activity.value= _activity.value.copyWith(id:uuid.v4());
                                       _activity.value = _activity.value.copyWith(avatar:org.picture);
                                        context
                                            .read(createActivityUSeCaseProvider)
                                            .execute(CreateActivityUseCaseInput(
                                          model: _activity.value
                                        ))
                                            .then(
                                              (result) => result.fold(
                                                (failure) {
                                                  print('FAILURE: $failure');
                                                  toast("Please try again");
                                                },(unit) {
                                                  print(_activity.value);
                                                  Navigator.of(context).pop();

                                                  toast(" Successful ");
                                                },);
                                      },child: Container(
                                        height: 80.0,alignment: Alignment.center,decoration: Boxdecoration(
                                            color: Colors.black38),child: Text('Post',style: TextStyle(
                                                color: Colors.white70,letterSpacing: 1.5,fontSize: 22.0,fontWeight: FontWeight.w600)),],)),);
                          });
                    },loading: () => const CircularProgressIndicator(),error: (error,stack) => Center(
                    child: Text("$error"),))
          : null,);
  }
}

但问题是每当我打印它的值时，它都不为空并且所有值都被占用

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）