Question

How can I restrict that applications can access only that data from SQL lite (android database) that I allow them?
for example- I want that my selected contacts from the contact list should not be accessed by any application running on the phone?
I am making an application which when run, will hide the selected contacts even from the default contact viewer application provided by the Android.

Answer 1

All contacts in the system contacts database are accessible to all apps (that got the right to access them).

If you want to hide contacts, you have to store them in your own, private database.