Compare Data on Android

http://developer.android.com/reference/java/util/Comparator.html
http://developer.android.com/reference/java/util/Collections.html
https://github.com/bauerca/drag-sort-listview
http://www.anddev.org/code-snippets-for-android-f33/alphabetical-listview-in-android-t56983.html
http://stackoverflow.com/questions/6475410/listview-with-alphabets-on-the-right-like-the-iphone-is-it-possible