Hackathon
http://www.basic4ppc.com/android/forum/threads/android-wifi-direct-tutorial.30409/
for the api http://developer.android.com/reference/android/net/wifi/p2p/package-summary.html
example from andorid http://developer.android.com/guide/topics/connectivity/wifip2p.html ->https://android.googlesource.com/platform/development/+/master/samples/WiFiDirectServiceDiscovery/src/com/example/android/wifidirect/discovery/WiFiServiceDiscoveryActivity.java