How to prompt user to update the Application, and when the user clicks on update it should update in background

Follow This Link and as shown in picture

Its a new PlayStore feature introduced in I/O 2019

The Play Store handles the update dialog when a new update is pushed to the store. Just ensure you update the APK with a higher version code. Happily there is no need for you to inform the user manually.

see: How to put an update notification for your android app then the users will be directed to Google Playstore?

https://stackoverflow.com/a/9878292/7767143