Is there any way to store com.amazonaws.mobileconnectors.s3.transfermanager.Download in some kind of prefrences?

I am downloading AWS-s3 objects using:

TransferManager transferManager = new TransferManager(s3client);
        GetObjectRequest getRequest = new GetObjectRequest(bucket, entity.getName());
            String s="";
            download = transferManager.download(bucket, entity.getName(), f);

Now i want to restore all downloading objects after i exit my application. is there any way?