Android - Socket Communication

Following is a very basic and very well documented tutorial on Socket Communication in JAVA which is same for Android.

Basic Socket Communication In Java:
http://download.oracle.com/javase/tutorial/networking/sockets/clientServer.html

Please make sure you give your application permission for internet access for Socket Communication:

In AndroidManifest.xml:

<uses-permission android:name="android.permission.INTERNET" />