Android native app - Json updates

Hi i am creating a native android app.

Lets say my app is on the app store and someone downloads it. My app get most of its content from my mysql database via Json. Every time i add new content to my mysql database, must the user update their app to get the new content or will it automatically update its self.

Kind regards

Well you can make it both ways, it all depends on you and how you code you Android App.