Android NFC P2P when NdefMessage was sent?

I made an application NFC P2P send Ndef data between 2 Smart Phones. When I send a MDEF message to other phone, 开发者_JS百科I use enableForegroundNdefPush() method. But, how to known when the Mdef message was sent? Thanks.

Unfortunately the Android NDEF push mechanism does not support any kind of notification when a P2P transaction has finished.