What is a LifecycleOwner?

An interface representing a component that has a lifecycle. It allows other objects (LifecycleObservers) to monitor the state of this component's lifecycle and respond to its changes.

Examples of LifecycleOwners in Android:

• Activity
• Fragment
• ViewModel (requires a special Hilt/AndroidX Lifecycler)

The main use is safe resource management (subscriptions, handlers) depending on the component's state.

class MyObserver : LifecycleObserver {

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    fun onStart() {
        // Perform actions when the LifecycleOwner starts
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    fun onStop() {
        // Perform actions when the LifecycleOwner stops
    }
}

// In a LifecycleOwner (e.g., Activity)
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    lifecycle.addObserver(MyObserver()) // Adding an observer
}