[NewFeature] Add database export util.
[NewFeature] Add database export util.

Ryan800/android-utils,ruilyzhu/android-utils,chaoallsome/android-utils,huhu2008/android-utils,SoftwareME/android-utils,jingle1267/android-utils,Heart2009/android-utils,VikingDen/android-utils,mumer92/android-utils-1,tsdl2013/android-utils