How distribute rooms ?

Hi comminity,

I have problem in rooms "MUC" persistent,

I need a room for twoo guys for example :

user1 + user2 = room1

user3 + user 4 = room2

or

user3 + user1 = room3

user3 + user2 = room4

In the same code "android" how I can distribute roms ?

In the click when create room, I can create currentUser+userfriend, but is android, the other user can't userfriend+currentUser is ironic.

if you do not know any of this, at least, as I get the rooms "MUC" persistent?

code example : 

String roomId ="test@conference.delive";

muc = new MultiUserChat(connection,roomId );

I need :

String roomId ="CurrentUser+GetUser@conference.delive";

String roomId ="test1+test2@conference.delive";

But if  if I find myself in the position of user 2

String roomId ="test2+test1@conference.delive";

Room different how repair ?