How to implement the Android Application Lifecycle in Monogame?

[KonajuGames]

@Eversor

So the activity by itself remains but the process is killed,

The other way around. The activity is killed but the process remains. The idea behind is that it allows for faster relaunches of the app.

In MonoGame, the Game object is created in the Activity.OnCreate() and disposed in the Activity.OnDestroy(). If the activity is destroyed, you really want to free up resources, which is why the Game object is disposed.