Question

我在android studio中有一个活动，它将记录上传到AWS DB，如下所示：

final Context appContext = getApplicationContext();
final AWSConfiguration awsConfig = new AWSConfiguration(appContext);
final IdentityManager identityManager = new IdentityManager(appContext, awsConfig);
IdentityManager.setDefaultIdentityManager(identityManager);
identityManager.doStartupAuth(activity, new StartupAuthResultHandler() {
    @Override
    public void onComplete(StartupAuthResult startupAuthResult) {
        // User identity is ready as unauthenticated
        // user or previously signed-in user.
    }
});

final AWSCredentialsProvider credentialsProvider = identityManager.getCredentialsProvider();
AmazonDynamoDBClient dynamoDBClient = new AmazonDynamoDBClient(credentialsProvider);

this.dynamoDBMapper = DynamoDBMapper.builder()
    .dynamoDBClient(dynamoDBClient)
    .awsConfiguration(awsConfig)
    .build();

new Thread(new Runnable() {
    @Override
    public void run() {
        Log.d("Show Progress:", "Start saving an item");

        dynamoDBMapper.save(poll);

        Log.d("Show Progress:", "Saved an item");
    }
}).start();

它在第一次上传时工作正常但是当我从手机中选择一个图像（图像选择器启动）然后再次调用上传时会抛出错误。

我从控制台获得的指出问题根源的信息如下......

上传成功时：

D/IdentityManager: Starting up authentication...
D/IdentityManager: Got user ID: XXXXXXXXXXXXXXXXX
D/Show Progress:: Start saving an item
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
D/Show Progress:: Saved an item

上传失败时

D/IdentityManager: Starting up authentication...
D/IdentityManager: Got user ID: XXXXXXXXXXXXXXXXXX
D/Show Progress:: Start saving an item
D/AWSRefreshingCognitoIdentityProvider: Refreshing token...
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
E/CognitoCachingCredentialsProvider: Failure to get credentials

出于某种原因，在调用上传后“select image”之后，identityProvider会刷新令牌，因此无法检索凭据。有没有办法来解决这个问题？任何帮助将不胜感激。

非常感谢

Answer 1

经过几天拔出头发后，终于找到了解决方案。

重建Credentials提供程序，如下所示，并完整删除了身份管理器。

    final Context appContext = activity;
    final AWSConfiguration awsConfig = new AWSConfiguration(appContext);

    final CognitoCachingCredentialsProvider credentialsprovider1 = new CognitoCachingCredentialsProvider(activity, awsConfig);

这并没有完全解决问题，我还必须更改refreshThreshold：

    credentialsprovider1.setRefreshThreshold(10);

在上载期间刷新AWS数据库令牌会导致错误

1 个答案: