android - FirestoreRecyclerAdaptor 未显示添加到 Firestore 的第一个项目

Question

我有一个名为今天的片段，其中我得到了当天的所有任务。但是，当我在当天向 Firestore 添加项目时，这是添加到 Firestore 的第一个任务，该任务现在显示在片段中，当我添加第二个任务时，显示第三个相同的。但是第一个任务从来没有显示，你知道为什么要这样做吗？

这是今天的片段：

public class TodayFragment extends Fragment {
    private View rootView;
    private TodayAdaptor todayAdaptor;

    private ColorDrawable swipeBackgroundRight = new ColorDrawable(Color.parseColor("#FF0000"));
    private Drawable iconDelete;


    private FirebaseFirestore firestore = FirebaseFirestore.getInstance();
    private CollectionReference collectionReference;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        if (getActivity() != null) {
            getActivity().setTitle(R.string.today);
        }

        collectionReference = firestore.collection("Users")
                .document(FirebaseAuth.getInstance().getCurrentUser().getUid())
                .collection("Tasks");

        iconDelete = ContextCompat.getDrawable(getActivity(), R.drawable.ic_delete);
        rootView = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_today, container, false);
        RecyclerView recyclerViewToday = rootView.findViewById(R.id.recycler_view_today);

        /* create the options for query */
        Calendar calendar = Calendar.getInstance();
        String dateFormatted = java.text.DateFormat.getDateInstance(java.text.DateFormat.FULL).format(calendar.getTime());

        Query query = collectionReference.whereEqualTo("date", dateFormatted);
        FirestoreRecyclerOptions<Task> options =
                new FirestoreRecyclerOptions.Builder<Task>()
                        .setQuery(query, Task.class)
                        .build();

        todayAdaptor = new TodayAdaptor(options);
        recyclerViewToday.setHasFixedSize(true);
        recyclerViewToday.setLayoutManager(new LinearLayoutManager(getActivity()));
        recyclerViewToday.setAdapter(todayAdaptor);

        new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.RIGHT) {
            @Override
            public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
                return false;
            }

            @Override
            public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
                if (direction == ItemTouchHelper.RIGHT) {
                    todayAdaptor.deleteTask(viewHolder.getAdapterPosition());
                    Toast.makeText(getActivity(), "Task deleted", Toast.LENGTH_SHORT).show();
                }


            }

            @Override
            public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {


                View itemView = viewHolder.itemView;
                int iconMargin = (itemView.getHeight() - iconDelete.getIntrinsicHeight()) / 2;
                if (dX > 0) {
                    swipeBackgroundRight.setBounds(itemView.getLeft(), itemView.getTop(), (int) dX, itemView.getBottom());
                    iconDelete.setBounds(itemView.getLeft() + iconMargin, itemView.getTop() + iconMargin, itemView.getLeft() + iconMargin + iconDelete.getIntrinsicWidth(), itemView.getBottom() - iconMargin);
                } else {
                    swipeBackgroundRight.setBounds(0, 0, 0, 0);
                }
                c.save();

                swipeBackgroundRight.draw(c);
                if (dX > 0) {
                    c.clipRect(itemView.getLeft(), itemView.getTop(), (int) dX, itemView.getBottom());
                } else {
                    c.clipRect(itemView.getRight() + (int) dX, itemView.getTop(), itemView.getRight(), itemView.getBottom());
                }

                iconDelete.draw(c);

                c.restore();

                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
            }
        }).attachToRecyclerView(recyclerViewToday);

        return rootView;
    }

    @Override
    public void onStart() {
        super.onStart();
        todayAdaptor.startListening();
    }

    @Override
    public void onStop() {
        super.onStop();
        todayAdaptor.stopListening();
    }
}

这是我的适配器：

public class TodayAdaptor extends FirestoreRecyclerAdapter<Task, TodayAdaptor.TodayViewHolder> {

    public TodayAdaptor(@NonNull FirestoreRecyclerOptions<Task> options) {
        super(options);
    }

    @Override
    protected void onBindViewHolder(@NonNull TodayViewHolder holder, int position, @NonNull Task model) {
        holder.todayCheckBox.setChecked(model.isCompleted());
        holder.taskDescription.setText(model.getName());
    }

    @NonNull
    @Override
    public TodayViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.today_item, parent, false);
        return new TodayViewHolder(view);
    }

    public void deleteTask(int position){
        /* save the item to be
          restored if the user want's so
         */
        getSnapshots().getSnapshot(position).getReference().delete();
    }


    class TodayViewHolder extends RecyclerView.ViewHolder {
        private CheckBox todayCheckBox;
        private TextView taskDescription;

        public TodayViewHolder(@NonNull View itemView) {
            super(itemView);
            todayCheckBox = itemView.findViewById(R.id.today_item_check_box);
            taskDescription = itemView.findViewById(R.id.today_item_task_description);
        }

    }
}

标签： androidfirebasefirebase-realtime-databaseandroid-recyclerviewgoogle-cloud-firestore