how to restrict the user to access only my application in the tablet? We are giving tablets to our customers with our own app installed in it. I only want the customers to work with our app only. I don't want them to watch video in youtube or chat with whatsapp. How do i restrict them to use only my application? Is there any way to monitor?
Since Android 4.2 tablet can have multiple users. At least I have seen this in Nexus 7.

You need to do the following:


Protect your default user account on the tablet with a password
Create a restricted user account and give the user access to apps that you want them to have


Note: Multi-user is not available on Android phones or with older Android OSes.
You cannot protect your tablet from being factory rest by user and having access to all.