Android Encode-Decode Tools

i need some programming at android, (about MD5 Encode-Decode app) but i searched and nothing found for start programming about this app.. please show us some refrence about this project and i want use (for.e.x) from this url : http://ift.tt/StSIV9 for my project like database and i have two text view and 2 button something like that i want : http://ift.tt/1zlSb93 any suggestion will be usefull...