使用 Amplify Flutter 插件并添加构建设置

步骤：

1. 在 Flutter 项目中添加 Amplify Flutter 插件

dependencies:
  amplify_flutter: 

2. 设置 Amplify Flutter

在项目的 lib 文件夹中创建一个名为 amplify.dart 的文件，并添加以下内容：

import 'package:amplify_flutter/amplify_flutter.dart';

void configureAmplify() async {
  // Add auth if needed
  // AmplifyAuthCognito auth = AmplifyAuthCognito();
  // await Amplify.addPlugin(auth);

  AmplifyAnalyticsPinpoint analyticsPlugin = AmplifyAnalyticsPinpoint();
  AmplifyStorageS3 storagePlugin = AmplifyStorageS3();
  Amplify.addPlugins([
    analyticsPlugin,
    storagePlugin,
  ]);

  Amplify.configure(
      amplifyconfig); // Make sure to replace with your own Amplify configuration
}

3. 配置 Amplify 建立步骤

在项目的 lib 文件夹中添加一个名为 amplifyconfig.dart 的文件，并替换其中的内容，确保使用自己的 Amplify 配置。

const amplifyconfig = '''{
  "UserAgent": "aws-amplify-cli/2.0",
  "Version": "1.0",
  "auth": {
    "plugins": {
      "awsCognitoAuthPlugin": {
        "IdentityManager": {
          "Default": {}
        },
        "CredentialsProvider": {
          "CognitoIdentity": {
            "Default": {
              "PoolId": "REPLACE_WITH_YOUR_ID",
              "Region": "REPLACE_WITH_YOUR_REGION"
            }
          }
        },
        "CognitoUserPool": {
          "Default": {
            "PoolId": "REPLACE_WITH_YOUR_POOL_ID",
            "AppClientId": "REPLACE_WITH_YOUR_APP_CLIENT_ID",
            "AppClientSecret": "REPLACE_WITH_YOUR_APP_CLIENT_SECRET",
            "Region": "REPLACE_WITH_YOUR_REGION"
          }
        },
        "Auth": {
          "Default": {
            "authenticationFlowType": "USER_SRP_AUTH"
          }
        }
      }
    }
  },
  "analytics": {
    "plugins": {
      "awsPinpointAnalyticsPlugin": {
        "pinpointAnalytics": {
          "appId": "REPLACE_WITH_YOUR_APP_ID",
          "region": "REPLACE_WITH_YOUR_REGION"
        },
        "pinpointTargeting": {
          "region": "REPLACE_WITH_YOUR_REGION"
        }
      }
    }
  },
  "storage": {
    "plugins": {
      "awsS3StoragePlugin": {
        "bucket": "REPLACE_WITH_YOUR_BUCKET_NAME",
        "region": "REPLACE_WITH_YOUR_REGION",
        "defaultAccessLevel": "guest"
      }
    }
  }
}''';

4. 在项目中添加 AWS Amplify Hosting 插件

添加以下依赖项：

dependencies:
  amplify_flutter: 
  amplify_flutter_auth_cognito: 
  amplify_flutter_storage_s3: 
  amplify_flutter_analytics_pinpoint: 
  amplify_flutter_category: 

5. 在 pubspec.yaml 文件中注册 Amplify 插件

在 pubspec.yaml 文件中添加以下内容：

flutter:
  uses-material-design: true

  assets:
    - assets/

amplify_flutter:
  plugins:
    - awsAuthCognito: 
    - awsStorageS3: 
    - awsAnalyticsPinpoint