OnlineDataCenter - To use this Firt go to website (onlinedatacenter.in) and register as a master user. after regitser and login you can create different sharing group for your organization. after create a group you can add conatcs and files in each group.
after that give that group id and password for android app user. using this id and password android app user can add group and he can get all data of added group. in one group he can download contacts and files.
for download phases internet will be require. after download contacts all contacts will be in your app phonebook. if you want these contacts in your mobile phonebook, this options also included.