Как компонент LifecycleOwner отслеживает необходимость вызова метода onResume для конкретной Activity?

In Android, the LifecycleOwner component provides an interface for tracking the lifecycle of components such as Activity or Fragment. For Activity, LifecycleOwner automatically integrates with its lifecycle.

When an Activity transitions to the resumed state (i.e., becomes visible and interactive), the system calls the onResume() method. LifecycleOwner tracks these changes through internal lifecycle calls and notifies registered observers (LifecycleObservers) about the transition to the RESUMED state.

This is implemented through callback methods in Activity, such as onStart(), onResume(), onPause(), onStop(), which update the state of the LifecycleOwner. Thus, LifecycleOwner knows exactly when to call onResume or other methods, based on the current state of the Activity.

Example usage:

class MyActivity : AppCompatActivity(), LifecycleOwner {
    override fun onResume() {
        super.onResume()
        // LifecycleOwner updates the state to RESUMED
    }
}

In the end, LifecycleOwner does not call onResume directly but tracks the Activity's lifecycle to notify listeners about state changes.