android - 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 为大学制作一个 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工作，即将它连接到云。当我运行该应用程序时，我总是会收到以下错误:

    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.}
        at com.amplifyframework.api.aws.AWSApiPluginConfigurationReader.parseConfigurationJson(AWSApiPluginConfigurationReader.java:97)
        at com.amplifyframework.api.aws.AWSApiPluginConfigurationReader.readFrom(AWSApiPluginConfigurationReader.java:56)
        at com.amplifyframework.api.aws.AWSApiPlugin.configure(AWSApiPlugin.java:127)
        at com.amplifyframework.core.category.Category.configure(Category.java:86)
        at com.amplifyframework.core.Amplify.configure(Amplify.java:153)
        at com.amplifyframework.core.Amplify.configure(Amplify.java:120)
        at com.example.todo.MyAmplifyApplication.onCreate(MyAmplifyApplication.java:18)
        at android.app.Instrumentation.callApplicationOnCreate(Unknown Source:0)
        at android.app.ActivityThread.handleBindApplication(Unknown Source:1209)
        at android.app.ActivityThread.access$1400(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(Unknown Source:710)
        at android.os.Handler.dispatchMessage(Unknown Source:19)
        at android.os.Looper.loop(Unknown Source:242)
        at android.app.ActivityThread.main(Unknown Source:98)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(Unknown Source:11)
        at com.android.internal.os.ZygoteInit.main(Unknown Source:275)
     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.}
        at com.amplifyframework.api.aws.AWSApiPluginConfigurationReader.parseConfigurationJson(AWSApiPluginConfigurationReader.java:72)
        at com.amplifyframework.api.aws.AWSApiPluginConfigurationReader.readFrom(AWSApiPluginConfigurationReader.java:56) 
        at com.amplifyframework.api.aws.AWSApiPlugin.configure(AWSApiPlugin.java:127) 
        at com.amplifyframework.core.category.Category.configure(Category.java:86) 
        at com.amplifyframework.core.Amplify.configure(Amplify.java:153) 
        at com.amplifyframework.core.Amplify.configure(Amplify.java:120) 
        at com.example.todo.MyAmplifyApplication.onCreate(MyAmplifyApplication.java:18) 
        at android.app.Instrumentation.callApplicationOnCreate(Unknown Source:0) 
        at android.app.ActivityThread.handleBindApplication(Unknown Source:1209) 
        at android.app.ActivityThread.access$1400(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(Unknown Source:710) 
        at android.os.Handler.dispatchMessage(Unknown Source:19) 
        at android.os.Looper.loop(Unknown Source:242) 
        at android.app.ActivityThread.main(Unknown Source:98) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(Unknown Source:11) 
        at com.android.internal.os.ZygoteInit.main(Unknown Source:275)

我完全按照教程中的步骤操作，但我总是卡在这里。这是我所做的:

• 在项目的根目录中运行“amplify init”
• 运行“amplifyPush”(如教程中所示)

到目前为止，应用程序仍然运行良好。一直失败的是下一步，就是添加:

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

我已经尝试并创建了一个全新的项目，并确保再次按照这些步骤操作，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显示如何使用我的有限账户使用 AWS 的服务。谁能帮忙？我完全被卡住了，我什至不确定出了什么问题。感谢任何帮助，谢谢!

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 下。当您设置 Android DataStore 时，此文件会自动包含在您的项目中。

Failed to parse configuration, missing required key: endpoint

此消息表明您的 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 应该看起来像这样(如果您使用的是 API key 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 amplify push，则可能会发生此错误。在这种情况下，您的配置文件可能几乎是空的:

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

我认为端点设置不如 Amplify 文档中应有的那样清晰。感谢备案this GitHub issue in the Amplify docs project .我们将努力改进文档。

注意:我是 AWS Amplify Android 的维护者。