Inserting A Button That Allows Me To Delete All SQLite Table Information on Android

Following this tutorial https://www.youtube.com/watch?v=3k3CunDZpFk

I have successfully been able too get information's from SQLite Database and display in List View.

However, i do not know how to make a button that delete's this information when inserted, and where this code should go.

Would appreciate it if anybody could help.