Android SQLite database not saving data after app is closed

I was looking for some examples to learn how to use SQLite in android and found this: http://ift.tt/1D8xXlV

I downloaded the project file and noticed that when I exit the app, if I have edited an entry or deleted one, it doesn't keep the changes afterwards. Shouldn't the database file just keep everything stored and up to date? What needs to be done to this code for it do so? Thanks!