b2b mobile app

I want an application build on android platform as front end and php/java back end,It will be b2b app like registration multiple(whole sellers, retailers),items display wholesellerwise product wise costwise,order,order records offline downloaded,order tracking,order status update very simple n generic app not specific to any area like grocery [login to view URL] requirement is to manage multiple whole seller to multiple retailer relationship on mobile like many-many,one -many or one-one, also it should have appointment module to take appointment very generic it can be retailer appointment my whole seller or whole sellers appointment by retailer ,it should be very genric in nature,yes admin module to manage all this offline n then upload,security module at product level access,Also need source code.