Lifecycle-aware components can only observe the status of objects that are lifecycle owners. Lifecycle owners implement the LifecycleOwner interface and are assigned a companion Lifecycle object which is responsible for storing the current state of the component and providing state information to lifecycle observers. Most standard Android Framework components (such as activity and fragment classes) are lifecycle owners. Custom classes may also be configured as lifecycle owners by using the LifecycleRegistry class and implementing the LifecycleObserver interface. For example:
class SampleOwner: LifecycleOwner {
private val lifecycleRegistry: LifecycleRegistry
init {
lifecycleRegistry = LifecycleRegistry(this)
lifecycle.addObserver(DemoObserver())
}
...
