没有为“_MyAppState”类型定义方法“Amplify”。 -颤振放大

Question

我刚刚开始学习 AWS Amplify，并按照https://aws.amazon.com/getting-started/hands-on/build-flutter-app-amplify/module-two/ 中给出的步骤在我的 Flutter 项目中初始化 Amplify。但是当我尝试集成 Amplify（使用语句 final _amplify = Amplify();) 在我的应用程序中。

下面是我的 main.dart 文件。

import 'package:flutter/material.dart';
import './amplifyconfiguration.dart';
import 'package:amplify_core/amplify_core.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final _amplify = Amplify();

  @override
  void initState() {
    super.initState();
    _configureAmplify();
  }

  @override
  Widget build(BuildContext context) {
    return Container();
  }

  void _configureAmplify() async {
    try {
      await _amplify.configure(amplifyconfig);
      print('Successfully configured Amplify ????');
    } catch (e) {
      print('Could not configure Amplify ☠️');
    }
  }
}

放大我在 pubspec.yaml 中导入的依赖

amplify_core: '<1.0.0'

amplifyconfiguration.dart

const amplifyconfig = ''' {
   "UserAgent": "aws-amplify-cli/2.0",
   "Version": "1.0"
}''';

另外，当我运行“放大控制台”时，我得到 App with id: xxxxxxxxxx not found

Answer 1

根据https://github.com/aws-amplify/amplify-flutter/issues/274 amplify_core 现在重命名为 amplify_flutter，所以你需要更改

amplify_core: '<1.0.0'

到

amplify_flutter: '<1.0.0'

另外，由于 Amplify 类现在是一个静态单例，你不需要实例化它，所以你可以去掉这行：

final _amplify = Amplify();