Lock Android Device to Run Only One App
This may not help but the L preview has a task locking feature included that may be of some insight, I'm not aware of how it functions as yet
Task locking
The L Developer Preview introduces a new task locking API that lets you temporarily restrict users from leaving your app or being interrupted by notifications. This could be used, for example, if you are developing an education app to support high stakes assessment requirements on Android. Once your app activates this mode, users will not be able to see notifications, access other apps, or return to the Home screen, until your app exits the mode.
http://developer.android.com/preview/api-overview.html
Hope this helped
- Suppress the Title Bar & Make Your App a Launcher
- Root Your Tablet
- Modify System Files and Settings to hide the soft keys
On the next link you can find the complete solution for the Nexus 7 (2012)
http://thebitplague.wordpress.com/2013/04/05/kiosk-mode-on-the-nexus-7/
simple Answer is:
- Lock Install button with modify system settings.
- Create your own customized-ROM and apply your requirement to that ROM.
more info, visit XDADavelopers