android it button click

http://stackoverflow.com/questions/10947114/button-selection-in-android

https://www.youtube.com/watch?v=MtmHURWKCmg

https://www.youtube.com/watch?v=R6QTfIh23YA

5 ways
https://www.youtube.com/watch?v=cqkEPcqU2QU

inner class
https://www.youtube.com/watch?v=U7qvQF6J0gE

3rd way, interface variable
https://www.youtube.com/watch?v=2s63_XHC9eI
http://docs.oracle.com/javase/tutorial/java/javaOO/anonymousclasses.html
http://stackoverflow.com/questions/355167/how-are-anonymous-inner-classes-used-in-java