This project demo some Android animation and build a cool new animation: Unhide and active
##Dependence http://nineoldandroids.com/
##Goal
- Learn Android animation system
- Build new animation: unhide and active (I don't know how to name it)
##What is "Unhide and active"
- Press button one time - it'll show the full button (slide from the edge of the screen), and then restore to its default position after 2 seconds.
- Double click the button will active it's function (interval between two clicks should smaller 2 seconds).