Asynchronous socket, http (client+server), websocket, and socket.io library for android. Based on nio, not threads. http://blog.codepainters.com/2012/02/17/why-java-nio-is-a-better-idea-for-android/
https://github.com/koush/AndroidAsync
or
http://koush.com/AndroidAsync
https://github.com/koush/AndroidAsync
or
http://koush.com/AndroidAsync