title: How to get S3 file using android SDK
body: <p>I am developing a small SDK, and I need to get some files from AWS S3.</p>
  
  <p>Until now I was using a static AWS credentials, as I understood this is very unsecured way to do it, since the Access &amp; Secret Keys are exposed.</p>
  
  <p>I know about AWS Cognito, but I think this is not suitable for an SDK.</p>
  
  <p>Any other way to do it without exposing Access &amp; Secret Key?</p>