Use the 'parent' attribute of the ElggMenuItem class

http://reference.elgg.org/classElggMenuItem.html

Check the archives of the google development mailing group on google groups. There was a discussion about an android client at some point.

here's one that's worth looking at http://www.kramnorth.com/elgg/ios - it's a paid service

@Uwe Heldt As said Ismayil Android client is available on https://github.com/josealopezpastor/ElggAndroidClient

It's definitely possible, though not out of the box.  It will require some custom coding to enforce restricted access, but the base system is there and malleable enough that I would consider elgg an appropriate tool.

Hi Uwe,

did you manage to create your groups only community? How?

I would like to do something like:

• every user when registering to the site chooses a group, which is closed;
• in the navbar he should see the Activity, Blog, Pages, Photo, File and so on of his group and not the site wide one

Any help is very appreciated :-)

Thanks,

Matteo