Android: how to protect data in a SQLite database?
Root access for everybody and security are mutually exclusive.
Any application or user with root permissions can read and modify each and every file on your system, as well as all of the main memory. That doesn't leave many places to store a potential encryption key for the database.
You could hide parts of the key in the executables, configuration files etc, but everything you could come up with would be nothing more than obfuscation and security by obscurity.
If a user opts to grant root access to everybody, that's their decision, and it's not your job as an app developer to prevent any harm that might be caused.
Update:Storing API keys in Android, is obfustication enough? is a pretty similar issue - it's about protecting API keys, but it's the same situation with regards to your options.
sqlcipher for Android might help here.
I think based on your requirement the best method is using consistency of data,for example MD5 the score and time, then put score and time and MD5 in to the table, then every time wanting to use that row of DB check the MD5 of the score and time if the one in DB and the one which calculated are same, the row is consistent otherwise it was hacked!