A friend of mine asked me if it was possible to password protect his Dropbox stuff, so when he is on the family iPad, only he has access to the materials in it. I told him I did not think it was possible. I am thinking that the iPad really is not focused on multiple users. Sure you can have multiple email accounts in Mail, but no way to shield info from other users.
And to the best of my knowledge, none of the Android phones/tablets provide that either.
And to the best of my knowledge, none of the Android phones/tablets provide that either.