Android Drag and Drop Step by Step

http://blahti.wordpress.com/2010/12/20/moving-views-in-android-part-1/
http://blahti.wordpress.com/2011/01/17/moving-views-part-2/
http://blahti.wordpress.com/2011/02/10/moving-views-part-3/
http://blahti.wordpress.com/2011/10/03/drag-drop-for-android-gridview/