Android ViewModel is very useful. However ViewModel has no args constructor by default. Typical usage of ViewModel looks like: public class UserModel extends ViewModel { } final UserModel viewModel = ViewModelProviders . of ( this ). get ( UserModel . class ); Let's look the definition of ViewModelProviders.of method. /** * Creates a {@link ViewModelProvider}, which retains ViewModels while a scope of given Activity * is alive. More detailed explanation is in {@link ViewModel}. * * It uses the given {@link Factory} to instantiate new ViewModels. * * @param activity an activity, in whose scope ViewModels should be retained * @param factory a {@code Factory} to instantiate new ViewModels * @return a ViewModelProvider instance */ @NonNull @MainThread public static ViewModelProvider of ( @NonNull FragmentActivity activity , @Nullable Factory factory ) { Have you found it? We can pas