How can an Android application be closed smoothly using Kotlin?

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To close an Android application smoothly using Kotlin, you can use the following code:

finish()
moveTaskToBack(true)

The finish() function will close the current activity and the moveTaskToBack(true) will move the application to the background. This will allow the user to return to the home screen and the application will still be running in the background.

It is important to note that completely closing an application is generally discouraged in Android, as the operating system manages the application lifecycle and killing an app may result in data loss or other issues. Instead, users are encouraged to use the home button to return to the home screen, and the operating system will handle the rest.