在BottomSheetDialogFragment 与普通Fragment 之间共享Viewmodel 不起作用（观察函数未触发）

Question

我想在我的基本片段和打开的 BottomSheetDialogFragment 之间共享相同的 Viewmodel

所以这就是我如何观察这两个片段之间的相同视图模型。

BottomSheetDialogFragment

public class TasteFilterBottomDialogFragment extends BottomSheetDialogFragment {

    private FilterTasteListViewModel filterTasteListViewModel;

    @Inject
    ViewModelProvider.Factory viewModelFactory;

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        filterTasteListViewModel = ViewModelProviders.of(getActivity(),
                viewModelFactory).get(FilterTasteListViewModel.class);

        filterTasteListViewModel.init();
        observeViewModel(filterTasteListViewModel);
    }

    private void observeViewModel(FilterTasteListViewModel filterTasteListViewModel) {
        filterTasteListViewModel.getFilterTastes().observe(this, new Observer<ArrayList<String>>() {
            @Override
            public void onChanged(@Nullable ArrayList<String> tasteList) {
                // Only this one trigger when viewModel is updated
                Log.d("Bottom Dialog", tasteList.toString());
                filterTasteList = tasteList;
                setFilterButtonState(filterTasteList);
            }
        });
    }

}

我的基础片段

public class FoodListFragment extends BaseFragment {

    private static TasteFilterBottomDialogFragment tasteFilterBottomDialogFragment;

    @Inject
    ViewModelProvider.Factory viewModelFactory;

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        showFoodListFilterButton();

        if (mFoodList != null) {
            mFoodListAdapter.setFoodList(mFoodList);
        }

        final FilterTasteListViewModel filterTasteListViewModel = ViewModelProviders.of(getActivity(),
                viewModelFactory).get(FilterTasteListViewModel.class);

        filterTasteListViewModel.init();
        observeFilterTasteListViewModel(filterTasteListViewModel);
    }

    private void observeFilterTasteListViewModel(FilterTasteListViewModel filterTasteListViewModel) {
        filterTasteListViewModel.getFilterTastes().observe(this, new Observer<ArrayList<String>>() {
            @Override
            public void onChanged(@Nullable ArrayList<String> filterTasteList) {
                // This only trigger on the first time that fragment is initialise
                Log.d("FoodList", filterTasteList.toString());
            }
        });
    }

}

我的视图模型

public class FilterTasteListViewModel extends AndroidViewModel {

    private LiveData<ArrayList<String>> filterTastesObservable;

    public LiveData<ArrayList<String>> getFilterTastes() {
        return this.filterTastesObservable;
    }

    public void setFilterTastes(ArrayList<String> filterTastes) {
        ((MutableLiveData<ArrayList<String>>) this.filterTastesObservable).postValue(filterTastes);
    }

}

所以当我setFilterTastes只打电话给这条线时

Log.d("Bottom Dialog", tasteList.toString());

但实际上这条线也应该被调用（但它不是）。

Log.d("FoodList", filterTasteList.toString());

我的问题是如何使 baseFragment 中的 observable 与BottomSheetDialogFragment 中的工作方式相同？

谢谢！