Flutter -未成功添加亚马逊网络服务AmplifyStorageS3和AmplifyDataStore插件

Question

我正在尝试为Flutter配置AWS Amplify插件AmplifyDataStore和AmplifyStorageS3。

我收到以下错误：

I/amplify:flutter:auth_cognito( 1242): Added Auth plugin
I/amplify:flutter:api( 1242): Added API plugin
I/flutter ( 1242): Amplify plugin was not added
E/flutter ( 1242): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: AmplifyException(message: Amplify plugin AmplifyDataStore was not added successfully., recoverySuggestion: We currently don't have a recovery suggestion for this exception., underlyingException: MissingPluginException(No implementation found for method configureModelProvider on channel com.amazonaws.amplify/datastore))
E/flutter ( 1242): #0      AmplifyClass.addPlugin (package:amplify_flutter/amplify.dart:102:9)
E/flutter ( 1242): <asynchronous suspension>
E/flutter ( 1242):
I/flutter ( 1242): Amplify plugin was not added
E/flutter ( 1242): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: AmplifyException(message: Amplify plugin AmplifyStorageS3 was not added successfully., recoverySuggestion: We currently don't have a recovery suggestion for this exception., underlyingException: MissingPluginException(No implementation found for method addPlugin on channel com.amazonaws.amplify/storage_s3))
E/flutter ( 1242): #0      AmplifyClass.addPlugin (package:amplify_flutter/amplify.dart:102:9)
E/flutter ( 1242): <asynchronous suspension>
E/flutter ( 1242):
E/flutter ( 1242): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: MissingPluginException(No implementation found for method configure on channel com.amazonaws.amplify/amplify)
E/flutter ( 1242): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:156:7)
E/flutter ( 1242): <asynchronous suspension>
E/flutter ( 1242): #1      AmplifyClass.configure (package:amplify_flutter/amplify.dart:175:17)
E/flutter ( 1242): <asynchronous suspension>
E/flutter ( 1242): #2      _MyAppState._configureAmplify (package:insighteur_app/main.dart:46:7)
E/flutter ( 1242): <asynchronous suspension>
E/flutter ( 1242):

下面是main.dart文件中类的屏幕截图：

class _MyAppState extends State<MyApp> {
  bool _amplifyConfigured = false;
  void initState() {
    super.initState();
    _configureAmplify();
  }

  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: _amplifyConfigured ? Text('Check') : HomePage(),
      ),
    );
  }

  void _configureAmplify() async {
    // Add the following lines to your app initialization to add the DataStore plugin
    Amplify.addPlugin(AmplifyAuthCognito());

    Amplify.addPlugin(AmplifyDataStore(modelProvider: ModelProvider.instance));
    Amplify.addPlugin(AmplifyAPI());
    Amplify.addPlugin(AmplifyStorageS3());

    try {
      await Amplify.configure(amplifyconfig);
      setState(() {
        _amplifyConfigured = true;
      });
    } on AmplifyAlreadyConfiguredException {
      print(
          "Tried to reconfigure Amplify; this can occur when your app restarts on Android.");
    }
  }
}

我的amplifyconfiguration.dart文件如下所示：

const amplifyconfig = ''' {
    "UserAgent": "aws-amplify-cli/2.0",
    "Version": "1.0",
    "auth": {
        "plugins": {
            "awsCognitoAuthPlugin": {
                "UserAgent": "aws-amplify-cli/0.1.0",
                "Version": "0.1.0",
                "IdentityManager": {
                    "Default": {}
                },
                "CredentialsProvider": {
                    "CognitoIdentity": {
                        "Default": {
                            "PoolId": "us-west-2:fafb1966-fc0b-41e0-92e5-3124d5a8d27a",
                            "Region": "us-west-2"
                        }
                    }
                },
                "CognitoUserPool": {
                    "Default": {
                        "PoolId": "us-west-2_aH29w4X7B",
                        "AppClientId": "17c0b97ouv640bcp87m9v8pgtp",
                        "Region": "us-west-2"
                    }
                },
                "Auth": {
                    "Default": {
                        "authenticationFlowType": "USER_SRP_AUTH"
                    }
                },
                "S3TransferUtility": {
                    "Default": {
                        "Bucket": "insighteur3f5d08559c174463a5a2aa8681fc3dbe174435-dev",
                        "Region": "us-west-2"
                    }
                },
                "AppSync": {
                    "Default": {
                        "ApiUrl": "https://3w7mmufy5rdrlacj2qeg27zd7q.appsync-api.us-west-2.amazonaws.com/graphql",
                        "Region": "us-west-2",
                        "AuthMode": "API_KEY",
                        "ApiKey": "da2-u3xpqm5wvfbntmqor5cglgcatq",
                        "ClientDatabasePrefix": "insighteur_API_KEY"
                    },
                    "insighteur_AWS_IAM": {
                        "ApiUrl": "https://3w7mmufy5rdrlacj2qeg27zd7q.appsync-api.us-west-2.amazonaws.com/graphql",
                        "Region": "us-west-2",
                        "AuthMode": "AWS_IAM",
                        "ClientDatabasePrefix": "insighteur_AWS_IAM"
                    }
                }
            }
        }
    },
    "storage": {
        "plugins": {
            "awsS3StoragePlugin": {
                "bucket": "insighteur3f5d08559c174463a5a2aa8681fc3dbe174435-dev",
                "region": "us-west-2",
                "defaultAccessLevel": "guest"
            }
        }
    },
    "api": {
        "plugins": {
            "awsAPIPlugin": {
                "insighteur": {
                    "endpointType": "GraphQL",
                    "endpoint": "https://3w7mmufy5rdrlacj2qeg27zd7q.appsync-api.us-west-2.amazonaws.com/graphql",
                    "region": "us-west-2",
                    "authorizationType": "API_KEY",
                    "apiKey": "da2-u3xpqm5wvfbntmqor5cglgcatq"
                }
            }
        }
    }
}''';

pubspec.yaml文件依赖项如下所示：

dependencies:
  flutter:
    sdk: flutter
  flutter_color: any
  flutter_color_models: ^1.2.1

  amplify_flutter: '<1.0.0'
  amplify_auth_cognito: '<1.0.0'
  amplify_analytics_pinpoint: '<1.0.0'
  amplify_storage_s3: '<1.0.0'
  #file_picker: ^3.0.1
  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.0
  flutter_datetime_picker: ^1.5.1
  amplify_datastore: '<1.0.0'
  intl: ^0.15.7
  amplify_api: '<1.0.0'

dev_dependencies:
  flutter_test:
    sdk: flutter 

我试过关闭应用程序，flutter clean，flutter upgrade(使用2.14.0版本)，重启Android mobile AVD……

Answer 1

每当你得到一个Plugin not added exception，这通常是因为你正在执行一个hot-reload操作AFTER添加插件到你的应用程序。您需要完全STOP应用程序，然后再次RUN它。这就是我的问题所在

Answer 2

1. add amplify add storage如果成功，则执行

1. amplify push

1. 完成后，amplifyconfiguration.dart将更新为引用新调配的S3存储桶。

1. 将以下依赖项添加到您的应用程序的pubspec.yaml以及您在上面的前提条件中添加的其他依赖项：

依赖项: flutter: sdk: flutter amplify_storage_s3：'<1.0.0‘

提醒:还应在上安装amplify_auth_cognito

1. 将其导入到您的项目中：

/ 'package:amplify_auth_cognito/amplify_auth_cognito.dart'；//提醒:导入'package:amplify_storage_s3/amplify_storage_s3.dart';导入main.dart

1. 初始化放大存储

//添加此行，以包含Auth和Storage插件。Amplify.addPlugins([AmplifyAuthCognito(), AmplifyStorageS3()]);

1. 将数据上载到您的存储桶

void uploadFile() async { //使用您选择的文件选择机制文件FilePicker.getFile=等待文件(类型: FileType.image)；最终密钥=新的DateTime.now().toString()；UploadFileResult结果=等待Amplify.Storage.uploadFile(密钥:密钥，本地:文件)；}

下面是放大文档https://docs.amplify.aws/lib/storage/getting-started/q/platform/flutter#uploading-data-to-your-bucket