Delete the database file from the Assets folder… here is a solution to the problem.
Delete the database file from the Assets folder
I want to delete the files in the Assets folder at runtime. I have a database file in the Assets folder that is copied to the data folder at runtime, but after installing my application, the size of the application becomes twice as large (Assets + Data folder)!
How do I delete the database file from the Assets folder to avoid this?
Solution
You cannot delete files that are delivered with your application while running.
Check out the discussion about it:
How to remove a file in assets at run time?
The entire content of your APK is read-only and cannot be modified