无法在 Android Studio 中初始化 AWS Amplify for Android 应用程序？

Question

我正在使用 AWS 和 Android Studio 为大学制作 Android 应用程序。我一直试图通过https://docs.amplify.aws/start/q/integration/android弄清楚它是如何工作的，但我似乎无法让它在最后一部分中工作，即将其连接到云端。当我运行该应用程序时，我总是收到以下错误：

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    AmplifyException {message=Failed to parse configuration JSON for AWS API Plugin, cause=AmplifyException {message=Failed to parse configuration, missing required key: endpoint, cause=null, recoverySuggestion=Sorry, we don\'t have a suggested fix for this error yet.}, recoverySuggestion=Check amplifyconfiguration.json to make sure the AWS API configuration section hasn\'t been wrongly modified.}\n        at com.amplifyframework.api.aws.AWSApiPluginConfigurationReader.parseConfigurationJson(AWSApiPluginConfigurationReader.java:97)\n        at com.amplifyframework.api.aws.AWSApiPluginConfigurationReader.readFrom(AWSApiPluginConfigurationReader.java:56)\n        at com.amplifyframework.api.aws.AWSApiPlugin.configure(AWSApiPlugin.java:127)\n        at com.amplifyframework.core.category.Category.configure(Category.java:86)\n        at com.amplifyframework.core.Amplify.configure(Amplify.java:153)\n        at com.amplifyframework.core.Amplify.configure(Amplify.java:120)\n        at com.example.todo.MyAmplifyApplication.onCreate(MyAmplifyApplication.java:18)\n        at android.app.Instrumentation.callApplicationOnCreate(Unknown Source:0)\n        at android.app.ActivityThread.handleBindApplication(Unknown Source:1209)\n        at android.app.ActivityThread.access$1400(Unknown Source:0)\n        at android.app.ActivityThread$H.handleMessage(Unknown Source:710)\n        at android.os.Handler.dispatchMessage(Unknown Source:19)\n        at android.os.Looper.loop(Unknown Source:242)\n        at android.app.ActivityThread.main(Unknown Source:98)\n        at java.lang.reflect.Method.invoke(Native Method)\n        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(Unknown Source:11)\n        at com.android.internal.os.ZygoteInit.main(Unknown Source:275)\n     Caused by: AmplifyException {message=Failed to parse configuration, missing required key: endpoint, cause=null, recoverySuggestion=Sorry, we don\'t have a suggested fix for this error yet.}\n        at com.amplifyframework.api.aws.AWSApiPluginConfigurationReader.parseConfigurationJson(AWSApiPluginConfigurationReader.java:72)\n        at com.amplifyframework.api.aws.AWSApiPluginConfigurationReader.readFrom(AWSApiPluginConfigurationReader.java:56)\xc2\xa0\n        at com.amplifyframework.api.aws.AWSApiPlugin.configure(AWSApiPlugin.java:127)\xc2\xa0\n        at com.amplifyframework.core.category.Category.configure(Category.java:86)\xc2\xa0\n        at com.amplifyframework.core.Amplify.configure(Amplify.java:153)\xc2\xa0\n        at com.amplifyframework.core.Amplify.configure(Amplify.java:120)\xc2\xa0\n        at com.example.todo.MyAmplifyApplication.onCreate(MyAmplifyApplication.java:18)\xc2\xa0\n        at android.app.Instrumentation.callApplicationOnCreate(Unknown Source:0)\xc2\xa0\n        at android.app.ActivityThread.handleBindApplication(Unknown Source:1209)\xc2\xa0\n        at android.app.ActivityThread.access$1400(Unknown Source:0)\xc2\xa0\n        at android.app.ActivityThread$H.handleMessage(Unknown Source:710)\xc2\xa0\n        at android.os.Handler.dispatchMessage(Unknown Source:19)\xc2\xa0\n        at android.os.Looper.loop(Unknown Source:242)\xc2\xa0\n        at android.app.ActivityThread.main(Unknown Source:98)\xc2\xa0\n        at java.lang.reflect.Method.invoke(Native Method)\xc2\xa0\n        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(Unknown Source:11)\xc2\xa0\n        at com.android.internal.os.ZygoteInit.main(Unknown Source:275)\n

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我完全按照教程中的步骤进行操作，但我总是卡在这里。这就是我所做的：

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• 在项目根目录中运行“amplify init”
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• 运行“amplifyPush”（如教程所示）
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到目前为止，该应用程序仍然运行良好。总是在下一步失败，那就是添加：

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Amplify.DataStore.observe(Todo.class,\n       started -> Log.i("Tutorial", "Observation began."),\n       change -> Log.i("Tutorial", change.item().toString()),\n       failure -> Log.e("Tutorial", "Observation failed.", failure),\n       () -> Log.i("Tutorial", "Observation complete.")\n);\n

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我已经尝试并制作了一个全新的项目，并确保再次遵循这些步骤，但无济于事。我不确定它是否相关，但我也通过 AWS Educate 使用 AWS，因此没有那么多资源展示如何使用我的有限帐户使用 AWS 服务。有人可以帮忙吗？我完全陷入困境，我什至不知道出了什么问题。任何帮助表示赞赏，谢谢！

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Answer 1

Amplify Android 库在运行时加载配置文件。该文件必须存在于您的应用程序项目中，位于app/src/main/res/raw/amplifyconfiguration.json. 当您设置 Android DataStore 时，此文件会自动包含在您的项目中。

无法解析配置，缺少必需的密钥：端点

此消息表明您amplifyconfiguration.json存在，但不包含 DataStore 将与之通信的 AppSync 端点的合适配置。

您的amplifyconfiguration.json内容应该如下所示（如果您使用 API 密钥身份验证）：

{
  "userAgent": "aws-amplify-cli/2.0",
  "version": "1.0",
  "api": {
    "plugins": {
      "awsAPIPlugin": {
        "VARIES_DEPENDING_ON_YOUR_CLI_SESSION": {
          "endpointType": "GraphQL",
          "endpoint": "https:/UNIQUE_TO_YOUR_ENDPOINT.appsync-api.us-west-2.amazonaws.com/graphql",
          "region": "us-west-2",
          "authorizationType": "API_KEY",
          "apiKey": "da2-UNIQUE_TO_YOUR_API_KEY"
        }
      }
    }
  }
}

例如，如果您没有运行amplify add api和，则可能会发生此错误amplify push。在这种情况下，您可能有一个几乎空的配置文件：

{
  "userAgent": "aws-amplify-cli/2.0",
  "version": "1.0",
}

我认为端点设置并不像 Amplify 文档中应有的那样清晰。感谢您在 Amplify 文档项目中提交此 GitHub 问题。我们将努力改进文档。

注意：我是 AWS Amplify Android 的维护者。