make a server , if a device 'A' wants to send data to other device'B', 'A' will send data to server and server will send data to 'B'
use Cloud To Device Messaging "C2DM" technique for push notification from server to 'B' -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en

