Create SQLite database in android

Question

In my project, I want to construct an SQLite database with three tables, to which I'll add data and use it later. However, I like to maintain the database since when an app is first installed, it checks to see if the database already exists and updates it if so; otherwise, if not, a new database is created. still more I won't be developing an activity for my database construction since I am creating a DB class to help my app.

If you have any suggestions, please share them with me.