Preventing Android app from closing

Question

1. Is it possible to prevent an Android app. from closing?
2. Is it possible to do this without modifying the OS?

I don't want the app. to close unless the user authenticates with a password or some other mechanism. I don't want any system settings changed without authentication either.

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I want to use an Android tablet in stores and offices. I don't want customers messing with the OS or breaking stuff. So, I want the tablet locked to one app. until an administrator authenticates.

I don't want any modifications to the tablet, but I do want one app. to be functional.

Answer 1

Something like this with enhancements? Source of Android's lock screen or How to lock the Screen customly? Just like WaveSecure in Android

Maybe take a look at this source code and use it to extend the functionality of your app to lock to just your program.

The WaveSecure App requires entering a password before it allows access to the phone.

Edit: http://developer.android.com/guide/topics/admin/device-admin.html might give you the options you want too.