RecyclerView观察者，片段不更新数据

// 假设 adapter 是 RecyclerView 的 Adapter
adapter.notifyDataSetChanged();

@Override
public void onResume() {
    super.onResume();
    // 更新数据并通知 Adapter
    adapter.notifyDataSetChanged();
}

// 假设 liveData 是 LiveData 对象
liveData.observe(getViewLifecycleOwner(), new Observer<List<Item>>() {
    @Override
    public void onChanged(List<Item> items) {
        // 更新 Adapter 数据
        adapter.setItems(items);
        adapter.notifyDataSetChanged();
    }
});

public class MyFragment extends Fragment {
    private RecyclerView recyclerView;
    private MyAdapter adapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);
        recyclerView = view.findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

        adapter = new MyAdapter();
        recyclerView.setAdapter(adapter);

        // 假设 liveData 是 LiveData 对象
        liveData.observe(getViewLifecycleOwner(), new Observer<List<Item>>() {
            @Override
            public void onChanged(List<Item> items) {
                adapter.setItems(items);
                adapter.notifyDataSetChanged();
            }
        });

        return view;
    }
}