Problem about receive file when using smack

Hello,everyone:

I try to use smack in android app to send and receive file and I encounter problem when using Spack 2.6.3 to send file to a android AVD,

Its tips as follows:

0.0

Negotiating Stream

0.0

Negotiating Stream

0.0

Negotiating Stream

…and so on.

I search it in forum but still can not solve my problem and are there someone so nice to give me a hand?

Grate appreciate!