仿excel表格可实现运算

#ToenableProGuardinyourproject,editproject.properties #todefinetheproguard.configpropertyasdescribedinthatfile. # #AddprojectspecificProGuardruleshere. #Bydefault,theflagsinthisfileareappendedtoflagsspecified #in${sdk.dir}/tools/proguard/proguard-android.txt #Y