FileTransfer related issue?

Hi guys

I am trying to send files using OngoingFileTransfer but it doesn't work.

when it send something like this:

        OutgoingFileTransfer transfer = fileTransferManager 

                .createOutgoingFileTransfer(user); 

        try { 

                  InputStream ism = context.getAssets().open("sd.jpg");

                  long len = ism.available();

            transfer.sendStream(ism,"sd.jpg", len, "something"); 

        } catch (IOException e) {

                  e.printStackTrace();

                    }