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DefaultLifecycleObserver Callback interface for listening to LifecycleOwner state changes. 
HasDefaultViewModelProviderFactory Interface that marks a ViewModelStoreOwner as having a default ViewModelProvider.Factory for use with ViewModelProvider.ViewModelProvider(ViewModelStoreOwner)
LifecycleEventObserver Class that can receive any lifecycle change and dispatch it to the receiver. 
LifecycleObserver Marks a class as a LifecycleObserver. 
LifecycleOwner A class that has an Android lifecycle. 
LifecycleRegistryOwner This interface is deprecated. Use which extends LifecycleOwner, so there are no use cases for this class.  
Observer<T> A simple callback that can receive from LiveData
ViewModelProvider.Factory Implementations of Factory interface are responsible to instantiate ViewModels. 
ViewModelStoreOwner A scope that owns ViewModelStore


AbstractSavedStateViewModelFactory Skeleton of androidx.lifecycle.ViewModelProvider.KeyedFactory that creates SavedStateHandle for every requested ViewModel
AndroidViewModel Application context aware ViewModel
Lifecycle Defines an object that has an Android Lifecycle. 
LifecycleRegistry An implementation of Lifecycle that can handle multiple observers. 
LifecycleService A Service that is also a LifecycleOwner
LiveData<T> LiveData is a data holder class that can be observed within a given lifecycle. 
LiveDataReactiveStreams Adapts LiveData input and output to the ReactiveStreams spec. 
MediatorLiveData<T> LiveData subclass which may observe other LiveData objects and react on OnChanged events from them. 
MutableLiveData<T> LiveData which publicly exposes setValue(T) and postValue(T) method. 
ProcessLifecycleOwner Class that provides lifecycle for the whole application process. 
SavedStateHandle A handle to saved state passed down to ViewModel
SavedStateViewModelFactory ViewModelProvider.Factory that can create ViewModels accessing and contributing to a saved state via SavedStateHandle received in a constructor. 
ServiceLifecycleDispatcher Helper class to dispatch lifecycle events for a service. 
Transformations Transformation methods for LiveData
ViewModel ViewModel is a class that is responsible for preparing and managing the data for an Activity or a Fragment
ViewModelProvider An utility class that provides ViewModels for a scope. 
ViewModelProvider.AndroidViewModelFactory ViewModelProvider.Factory which may create AndroidViewModel and ViewModel, which have an empty constructor. 
ViewModelProvider.NewInstanceFactory Simple factory, which calls empty constructor on the give class. 
ViewModelProviders This class is deprecated. Use the constructors for ViewModelProvider directly.  
ViewModelProviders.DefaultFactory This class is deprecated. Use ViewModelProvider.AndroidViewModelFactory  
ViewModelStore Class to store ViewModels
ViewModelStores This class is deprecated. Use ComponentActivity.getViewModelStore() or Fragment.getViewModelStore() to retrieve a ViewModelStore directly from activities and fragments.  
ViewTreeLifecycleOwner Accessors for finding a view tree-local LifecycleOwner that reports the lifecycle for the given view. 
ViewTreeViewModelStoreOwner Accessors for finding a view tree-local ViewModelStoreOwner that allows access to a ViewModelStore for the given view. 


Lifecycle.State Lifecycle states.