animation的控件动画效果
http://www.itzhai.com/android-animation-used-to-achieve-control-of-animation-effects-and-use-of-interpolator-and-animationlistener.html
http://www.itzhai.com/android-animation-used-to-achieve-control-of-animation-effects-and-use-of-interpolator-and-animationlistener.html