First thing, when someone says they want a mobile app, that generally implies they want
to have a smartphone app on their phone that will launch and view a site as if it was an
APP. Then there are mobilejoomla templates that render a true mobilized website that
allows you to have a true mobile site interface, not just a responsive website.
If you want to have a website that adjusts to being viewed by a smartphone or
tablet, look for the templates that clearly note that they are RESPONSIVE. ( Caution:
not all responsive templates respond as advertisted) Example: Take a look at http://demotemplates.joomlashack.com/
and you will see which templates are RESPONSIVE.
You can go to these templates using your smartphone and see how they will really look when you implement them.
As for creating a Mobile APP, visit: http://appinventor.mit.edu/explore/
and learn how to create an
app. I have created apps that work as launchers to responsive sites, but have not gotten them to work correctly with the MobileJoomla sites.
I haven't tried it, but there is a mobile template switcher extension at: http://extensions.joomla.org/extensions ... play/21785
which will detect user agent and assign template for a mobile/tablet user.
I have found using MobileJoomla and their standard templates (and premium templates)
the most reliable use of mobile templates. My sites have seen a double increase in mobile visitors since I implemented mobilejoomla sites.