Android Image Drag and Drop and Pinch to Zoom
找到一個寫的不錯的lib 在 google code 上面
專案名稱：android-multitouch-controller
http://code.google.com/p/android-multitouch-controller/
其他參考資料
http://codingjunkie.net/android-drag-and-drop-part1/
http://codingjunkie.net/android-drag-and-drop-part-2/
http://codingjunkie.net/android-drag-and-drop-part-3/
http://www.wglxy.com/android-tutorials/moving-views--part-2-drag-drop
http://blahti.wordpress.com/2010/12/20/moving-views-in-android-part-1/
http://blahti.wordpress.com/2011/01/17/moving-views-part-2/
http://blahti.wordpress.com/2011/02/10/moving-views-part-3/
Some Sample
MTPhotoSortrDemo
