文件路径的 AWS 下载功能问题

AWS Download function issue with file path

我已经使用以下代码实现了下载 aws s3 文件的功能:

public void credentialsProvider()
{
    CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
            getApplicationContext(), "us-east-2:xxxxxx-xxxxx-xxxxx-xxxx-xxxxxxx", Regions.US_EAST_2
    );
   setAmazonS3Client(credentialsProvider);
    System.out.println("setAmazonS3Client done");
}

public void setAmazonS3Client( CognitoCachingCredentialsProvider credentialsProvider)
{
    s3 = new AmazonS3Client(credentialsProvider);

    s3.setRegion(Region.getRegion(Regions.US_EAST_2));
}

public void setTransferUtility()
{
    transferUtility = new TransferUtility(s3, getApplicationContext());
    System.out.println("setTransferUtility done");
}

public void setFileDownload()
{
    final String path = this.getFilesDir().getAbsolutePath();
    File myFile = new File(path);
    TransferObserver transferObserver = transferUtility.download("sample-bucket-001", "images-4.jpeg", myFile);
    transferObserverListener(transferObserver);
}

public void transferObserverListener(TransferObserver transferObserver)
{
    transferObserver.setTransferListener(new TransferListener() {
        @Override
        public void onStateChanged(int id, TransferState state) {
            System.out.println("onStateChanged: "+ state);
            if(state == TransferState.FAILED || state == TransferState.WAITING_FOR_NETWORK){
                
            }
        }

        @Override
        public void onProgressChanged(int id, long bytesCurrent, long bytesTotal) {
            int percentage = (int)(bytesCurrent/bytesTotal * 100);
            System.out.println("percentage: "+ percentage);
        }

        @Override
        public void onError(int id, Exception ex) {
            System.out.println("Error faced: "+ ex.toString());
        }
    });
} 

当我尝试执行以下代码时,出现以下错误:

  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxxxxx.xxxxxxxx/com.xxxxxx.xxxxxxxx.Activity}: java.lang.IllegalArgumentException: Invalid file: /data/user/0/com.xxxxxx.xxxxxxxx/files/

我无法将文件保存在外部存储设备上,因为我更喜欢将它们隐藏和保护起来,并在应用程序被删除时将其删除。我以前是用路径把文件保存在上面的,都是直接从网上加载的,没问题。 请大家指教。

提供给TransferUtility的文件路径需要包含文件名,例如:

final String path = this.getFilesDir().getAbsolutePath() + "images-4.jpeg";

我终于找到了所问问题的解决方案,使用全新的、以前未使用过的路径很简单,因此它可以创建用于存储下载的图片或文件的文件夹。

final String path = this.getFilesDir().getAbsolutePath()+"/zip";

我希望它能对某人有所帮助,我希望亚马逊的反馈能比 'invalid file'.

更具体一点