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How to transfer file same as whatsapp using smack?

@Hello All,

I am using smack api in my chat application and i have implement some code for sending file “OutgoingFileTransfer”. But it takes little bit more time to upload file.

So other user can not get instant update. I found two methods in documentation. please let me know which is better and what is difference.

sendFile(String fileName, long fileSize,String description)
sendStream(final InputStream in, final String fileName, final long fileSize, final String description)

SendStream is useful for sending file instantly ?