Add snapshot listener
Add snapshot listener

For class that care about Touch and Drag action on ImageView

walkingice/aster,z7z8th/aster,cuongmv162/aster,kanru/aster,z7z8th/aster,leijian/aster,liuyq/aster,Ryan2009/aster,kanru/aster,Ryan2009/aster,cuongmv162/aster,z7z8th/aster,Ryan2009/aster,liuyq/aster,walkingice/aster,liuyq/aster,cuongmv162/aster,leijian/aster,leijian/aster,kanru/aster,walkingice/aster