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我们为 web 启用了 Flutter 应用程序,但我们遇到了一些导入错误。所有导入都是有效的并且在 Android 中运行,所以我没有看到问题所在。

我研究了这个特定的导入,并了解到它是由应用程序中有多个 main() 引起的,但其他的是有效的。

import 'generated_plugin_registrant.dart';从 lbconnect_web|lib/screens/member/test_web_entrypoint.dart 在 5:1

对于似乎没有任何问题的包,还有 10 个其他导入错误。

这些是其他的,每个都有多个错误:

import 'package:lbconnect_web/models/checkin_model.dart';来自 lbconnect_web|lib/modules/check_in_question.dart 在 4:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';

checkin_model 只是一个变量的类,而 cupertino_settings 在我的 pubspec.yaml 中

flutter_cupertino_settings: ^0.0.9+1

编辑 3 - 错误

无法为某些源找到模块,这通常是由于导入错误、包中缺少依赖项(或者可能是 dev_dependency
需要移动到真正的依赖项)或构建失败(如果导入
生成的文件) .

请检查以下导入:

import 'package:lbconnect_web/models/checkin_model.dart';从 lbconnect_web|lib/screens/member/EmotionalWheel/choose.dart 在 8:1 import 'package:lbconnect_web/models/checkin_model.dart';从 lbconnect_web|lib/modules/check_in_question.dart 在 4:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';从 lbconnect_web|lib/screens/member/settings_2.0/widgets/selection_fields/card_settings_multiselect .dart 8:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';来自 lbconnect_web|lib/screens/member/settings_2.0/widgets/text_fields/card_settings_text.dart 7:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';来自 lbconnect_web|lib/screens/member/settings_2.0/widgets/numeric_fields/card_settings_switch.dart 8:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';来自 lbconnect_web|lib/screens/member/settings_2.0/widgets/picker_fields/card_settings_time_picker.dart 8:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';来自 lbconnect_web|lib/screens/member/settings_2.0/widgets/picker_fields/card_settings_color_picker.dart 9 :1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';从 lbconnect_web|lib/screens/member/settings_2.0/widgets/picker_fields/card_settings_date_picker.dart 在 8:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';从 lbconnect_web|lib/screens/member/settings_2.0/widgets/numeric_fields/card_settings_slider.dart 在 8:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';从 lbconnect_web |lib/screens/member/settings_2.0/widgets/picker_fields/card_settings_list_picker.dart 8:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';来自 lbconnect_web|lib/screens/member/settings_2.0/widgets/card_settings_panel.dart 7:1
import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';来自 lbconnect_web|lib/screens /member/settings_2.0/widgets/information_fields/card_settings_header.dart 7:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';来自 lbconnect_web|lib/screens/member/settings_2.0/widgets/information_fields/card_settings_instructions.dart 6:1 import 'package:flutter_cupertino_settings/flutter_cupertino_settings.dart';来自 lbconnect_web|lib/screens/member /settings_2.0/widgets/action_fields/card_settings_button.dart 在 4:1

无法为某些源找到模块,这通常是由于导入错误、包中缺少依赖项(或者可能是 dev_dependency 需要移动到真正的依赖项)或构建失败(如果导入生成的文件) .

请检查以下导入:

import 'generated_plugin_registrant.dart';从 lbconnect_web|lib/screens/member/test_web_entrypoint.dart 在 5:1

655ms 后失败 为 Web 构建应用程序... 31.1s 为 Web 构建应用程序失败。

编辑 2 - 检查模型

 class CheckInModel {
  String checkInId;


  CheckInModel({this.checkInId});

  factory CheckInModel.fromJson(Map<String, dynamic> json) {
    return CheckInModel(
      checkInId: json['CheckInID'],

   );
 }

}

编辑

YAML 中的包

    dependencies:
     flutter:
      sdk: flutter

     # The following adds the Cupertino Icons font to your application.
     # Use with the CupertinoIcons class for iOS style icons.
       cupertino_icons: ^0.1.2
       rxdart: ^0.22.0
      provider: ^3.0.0+1
      shared_preferences: 0.5.2
      flutter_local_notifications:

       dev_dependencies:
        flutter_test:
         sdk: flutter

      flutter_redux: ^0.5.2
     snaplist: ^0.1.3
      font_awesome_flutter: ^8.0.1
     http: ^0.12.0
     intl: ^0.15.7
    device_calendar: ^0.0.7
    dynamic_theme:
     eva_icons_flutter:
     flutter_speed_dial:
        sqflite:
         url_launcher: ^5.0.3
      swipedetector: ^1.2.0
        contacts_service: ^0.2.1
        agora_rtc_engine: 1.0.5
           permission_handler: ^3.0.0
       validators: ^2.0.0
      path_provider: ^1.1.0
     share_extend: ^1.0.9
        shimmer: ^1.0.0
       flutter_launcher_icons: ^0.7.2
        flutter_tableview:
        flutter_masked_text: ^0.8.0
          flutter_colorpicker: ^0.2.6
        meta: ^1.1.6
       auto_size_text: ^1.0.0
        flutter_email_sender: ^2.0.3
        fl_chart: ^0.2.0
      flutter_sms: ^1.0.1
      firebase_messaging: ^5.1.1
         image_picker: 0.6.0+17
      carousel_slider: ^1.3.0
      sliding_up_panel:
        scoped_model: ^1.0.1
           awesome_dialog: ^0.0.4

     flutter_icons:
    android: "launcher_icon" 
     ios: false
     image_path: "assets/logo/ic_launcher.png"

     flutter_email_sender:
      path: ../

      flutter_cupertino_settings: ^0.0.9+1
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1 回答 1

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您的错误的原因很可能是因为可能有一些包没有 web 的本机实现,但仅适用于 android / ios 。这也是为什么您的应用程序在 android 上运行良好的原因。Flutter 开发的官方包几乎都支持 web。(可能仍有一些例外)。要在 Web 上运行您的应用程序,您必须检查每个包是否支持 Web。

于 2020-01-29T14:22:37.273 回答