Android SQLite adding rows only once

From what's I understand, once an SQL db is created and populated it remains on the device until the app is uninstalled. For performance reasons I don't want to re insert all my rows every time the app is lauched, how can I wrap my insert statements so that I populated the db only the first time the app is launched?

Right now I have the inserts in the onCreate() method of my main activity. What is the best practice?

Thanks