在LifecycleObserver中使用LiveData

Question

我想在LifecycleObserver中使用LiveData，但是我必须传递一个Activity。我怎么得到这个？

public class ChatFragmentLifecycleObserver implements LifecycleObserver {


    @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
    void onCreate(LifecycleOwner owner) {


        ChatViewModel chatViewModel = ViewModelProviders.of(*here I need the Activity*).get(ChatViewModel.class);    
}