ViewDragHelper学习

http://www.apkbus.com/android-245699-1-1.html?_dsign=b8a273ef

http://blog.csdn.net/pi9nc/article/details/39583377

http://blog.csdn.net/lmj623565791/article/details/46858663

http://blog.csdn.net/jdsjlzx/article/details/41210659