使用来自android的未经验证的arn将数据保存到dynamodb不会'；行不通

我正在尝试从Android将测试记录保存到amazon dynamodb表中

    Context mContext = this.getApplicationContext();

    CognitoCachingCredentialsProvider cognitoProvider = new CognitoCachingCredentialsProvider(
            mContext, // get the context for the current activity
            "xxxxxxxxxxxxxx",
            "us-east-1:dsfhjhsd-sdfsfds-sdffds-dsffs",
            "arn:aws:iam::7777777777:role/Cognito_CustMobAnalyticsUnauth_DefaultRole",
            "YOUR AUTHENTICATED ARN HERE",
            Regions.US_EAST_1
    );

    try {

        AmazonDynamoDBClient ddb = new AmazonDynamoDBClient(cognitoProvider);
        //ddb.setRegion(Region.getRegion(Regions.US_EAST_1));
        DynamoDBMapper mapper = new DynamoDBMapper(ddb);

        androTest mytest = new androTest();
        mytest.setMyKey("testKey-1");

        try {
            mapper.save(mytest);

        } catch (AmazonServiceException ex) {
            Log.e("CustomError", "---> " + ex.getLocalizedMessage());
        }
    } catch (Exception e) {
        // This will catch any exception, because they are all descended from Exception
        Log.e("CustomError", "---> " + e.getLocalizedMessage());
        Log.e("CustomError", "---> " + e.getMessage());
    }

我在执行时收到以下消息，数据未更新。 我正在使用未经验证的arn

 D/CognitoCachingCredentialsProvider﹕ Loading credentials from SharedPreferences
 D/CognitoCachingCredentialsProvider﹕ No valid credentials found in SharedPreferences
 E/CustomError﹕ ---> null
 E/CustomError﹕ ---> null

以下是角色策略

{
"Version": "2012-10-17",
"Statement":[{
    "Effect":"Allow",
    "Action":"cognito-sync:*",
    "Resource":["*"]
    }]
}

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Stmtxxxxxx",
      "Effect": "Allow",
      "Action": [
        "dynamodb:DeleteItem",
        "dynamodb:DescribeTable",
        "dynamodb:GetItem",
        "dynamodb:PutItem",
        "dynamodb:Query",
        "dynamodb:Scan",
        "dynamodb:UpdateItem",
        "dynamodb:UpdateTable"
      ],
      "Resource": [
        "arn:aws:dynamodb:us-east-1:663633636363:table/androTest"
      ]
    }
  ]
}

以下是信任策略

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "",
      "Effect": "Allow",
      "Principal": {
        "Federated": "cognito-identity.amazonaws.com"
      },
      "Action": "sts:AssumeRoleWithWebIdentity",
      "Condition": {
        "StringEquals": {
          "cognito-identity.amazonaws.com:aud": "us-east-1:chgsdhg0-sdds-sdsd-7687668c05"
        },
        "ForAnyValue:StringLike": {
          "cognito-identity.amazonaws.com:amr": "unauthenticated"
        }
      }
    }
  ]
}

堆栈跟踪

android.os.NetworkOnMainThreadException
            at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
            at java.net.InetAddress.lookupHostByName(InetAddress.java:418)
            at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)
            at java.net.InetAddress.getAllByName(InetAddress.java:215)
            at com.amazonaws.org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
            at com.amazonaws.org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:278)
            at com.amazonaws.org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:162)
            at com.amazonaws.org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
            at com.amazonaws.org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:645)
            at com.amazonaws.org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:480)
            at com.amazonaws.org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
            at com.amazonaws.org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
            at com.amazonaws.http.AmazonHttpClient.executeHelper(Unknown Source)
            at com.amazonaws.http.AmazonHttpClient.execute(Unknown Source)
            at com.amazonaws.services.cognitoidentity.AmazonCognitoIdentityClient.invoke(Unknown Source)
            at com.amazonaws.services.cognitoidentity.AmazonCognitoIdentityClient.getId(Unknown Source)
            at com.amazonaws.auth.AWSAbstractCognitoIdentityProvider.getIdentityId(Unknown Source)
            at com.amazonaws.auth.AWSAbstractCognitoIdentityProvider.refresh(Unknown Source)
            at com.amazonaws.auth.AWSBasicCognitoIdentityProvider.refresh(Unknown Source)
            at com.amazonaws.auth.CognitoCredentialsProvider.startSession(Unknown Source)
            at com.amazonaws.auth.CognitoCredentialsProvider.getCredentials(Unknown Source)
            at com.amazonaws.auth.CognitoCachingCredentialsProvider.getCredentials(Unknown Source)
            at com.amazonaws.auth.CognitoCachingCredentialsProvider.getCredentials(Unknown Source)
            at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.invoke(Unknown Source)
            at com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient.updateItem(Unknown Source)
            at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper$SaveObjectHandler.doUpdateItem(Unknown Source)
            at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper$2.executeLowLevelRequest(Unknown Source)
            at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper$SaveObjectHandler.execute(Unknown Source)
            at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper.save(Unknown Source)
            at com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper.save(Unknown Source)
            at com.multixlabs.fdintcalculator.MainActivity.updateDynamodbAnalyticsTable(MainActivity.java:149)
            at com.multixlabs.fdintcalculator.MainActivity.btnCalculateClick(MainActivity.java:174)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

---

这似乎是一个网络问题。从Android3.x开始（我相信），在主/UI线程上进行网络调用会导致抛出此异常。如果您尝试将其异步保存到dynamo，通常的做法是使用异步任务，该错误应该会消失。

问题是

未找到有效凭据

，因此请检查此链接，如果它可以帮助您解决此问题：[使用Amazon Cognito凭据提供程序]（），谢谢。该链接是为经过身份验证的用户提供的。这里我正在进行未经验证的操作。

没有有效凭证

与未经验证的含义相同吗？您遇到的错误是在未经身份验证/身份验证之前发生的，它在开始时停止。无有效凭据消息不是错误，它是一条信息性消息，表示当前未缓存任何凭据。您能否提供更多关于捕获的异常的细节，即stacktrace？这将有助于缩小范围。谢谢Jeff-Stack trace在问题中添加