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我有一张很长的照片。
以及如何使用onFling的参数velocityY来移动这张图片
这张图片会先快速移动，然后缓慢移动。
像这种一扔的效果：http ://www.youtube.com/watch?v=Y1sMWF72Cn8&hd=1&t=5
http://mobile.tutsplus.com/tutorials/android/android-gesture/
http://www.inter-fuser.com/2010/01/android-coverflow-widget.html