I want to send the data on the android emulator to the local host web, and get some results.
String temp = \"http://10.0.2.2:8888/json/rec?user_data=\" + use
Its a known bug thats fixed in a future release.
http://code.google.com/p/android/issues/detail?id=12724
The easy fix is to use a different constructor to the URL .. the one that accepts hostname, port and file
URL(String protocol, String host, int port, String file)
EDIT
In your case, it would be
URL url = new URL("http", "10.0.2.2" , 8888 , "json/rec?user_data=" + user_data + "&friends=" + friends);
Probably because the host contains a colon, which it takes to mean this is a numeric IPv6 address