如何将Fragment UI创建延迟到服务器的GET请求解决之后？

我的启动器活动是一个TabLayout，其中包含以下几个片段。愿景是，在每次单击Tab时，Fragment的onCreate将使用Retrofit2库从服务器获取数据并通过onCreateView的RecyclerView显示数据。

当前，该应用程序在启动时崩溃，因为onCreateView首先完成，并且想要在异步GET请求甚至完成之前显示数据。具体来说，内部类ModelHolder的getItemCount方法产生一个空对象引用。

我有两个想法可以将Fragment的视图创建延迟到GET请求完成之后，以便视图实际上具有要显示的数据。

1）在Fragment上强制同步，以便onCreate必须在onCreateView开始之前完成。该应用程序将冻结一会儿，但不会像以前那样崩溃。

2）添加一个启动屏幕并使其成为启动程序活动，以便用户在加载数据时查看启动屏幕。我认为这很骗人，因为它可以避免问题。

延迟onCreateView的最佳方法是什么？如果该方法不是好的做法，那么有哪些替代解决方案？

public class ModelsFragment extends Fragment {

private final String API_KEY = "INSERT API KEY HERE";

private static final String ARG_CATEGORY = "model_category";
private String mCategory;

private RecyclerView mModelRecyclerView;
private ModelAdapter mModelAdapter;

private List<Model> mModels;

public static Fragment newInstance(String category) {
    Bundle args = new Bundle();
    args.putString(ARG_CATEGORY, category);
    ModelsFragment modelsFragment = new ModelsFragment();
    modelsFragment.setArguments(args);

    return modelsFragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mCategory = getArguments().getString(ARG_CATEGORY);

    EdmundsService service = EdmundsServiceGenerator.createService(EdmundsService.class);

    Map<String, String> options = new HashMap<>();
    options.put("state", "new");
    options.put("year", "2016");
    options.put("view", "basic");
    options.put("api_key", API_KEY);
    if (mCategory != null) {
        options.put("category", mCategory);
    }

    Call<Models> call = service.getModels(options);
    call.enqueue(new Callback<Models>() {
        @Override
        public void onResponse(Call<Models> call, Response<Models> response) {
            if (response.isSuccessful()) {
                mModels = response.body().getModels();
                Log.i("GET Status", "Successfully retrieved data");
                Log.i("GET Status", response.body().getModelsCount().toString());
            }
            else {
                Log.i("GET Status", "Failed to retrieve data");
            }
        }

        @Override
        public void onFailure(Call<Models> call, Throwable t) {
            Log.e("Error retrieving data", t.getMessage());
        }
    });
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    mModelRecyclerView = (RecyclerView) inflater.inflate(R.layout.fragment_models, container, false);
    updateUI();
    mModelRecyclerView.setHasFixedSize(true);
    mModelRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

    return mModelRecyclerView;
}

private void updateUI() {
    mModelAdapter = new ModelAdapter(mModels);
    mModelRecyclerView.setAdapter(mModelAdapter);
}

public class ModelHolder extends RecyclerView.ViewHolder {
    public ModelHolder(LayoutInflater inflater, ViewGroup parent) {
        super(inflater.inflate(R.layout.fragment_models_card_view_item, parent, false));

    }
}

public class ModelAdapter extends RecyclerView.Adapter<ModelHolder> {
    // Set number of Cards in the recycler view.
    private List<Model> models;

    public ModelAdapter(List<Model> models) {
        this.models = models;
    }

    @Override
    public ModelHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new ModelHolder(LayoutInflater.from(parent.getContext()), parent);
    }

    @Override
    public void onBindViewHolder(ModelHolder holder, int position) {

    }

    @Override
    public int getItemCount() {
        return models.size();
    }
}

}