childSnapshot.getKey（）;正在检索所有密钥，而不仅仅是一个密钥（我选择的那个）

问：

我正在努力从 RecyclerView 中仅提取所选项目的键，然后更新与该键关联的值或节点。当 reservationName 不同时，当前实现会正常运行，例如在“Wedding”的情况下。但是，当该 reservationName 中有多个密钥或预留项时，它会遇到问题。具体而言，如果我尝试设置或取消预订（洗礼），则该操作会影响所有预订（洗礼）或钥匙的状态，而不仅仅是我从列表项中选择的预订或密钥的状态。

RecyclerView 列表示例。我有一个用于重新安排的日期选择器，即使我选择了第一个，它也会显示两个日期选择器。首先，第一个日期选择器将更新第二个日期，然后第二个日期选择器将更新第一个日期选择器。取消、付款、重新安排或设置状态等所有功能都是一样的：

这是我的火力库结构：

我用于在预留中工作的示例代码。我使用Toast来检索密钥，然后它显示所有密钥：

private void cancelReservation(Reservation reservation) {
    DatabaseReference reservationRef = reservationsRef.child(reservation.getName());

    reservationRef.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if (dataSnapshot.exists()) {
                for (DataSnapshot childSnapshot : dataSnapshot.getChildren()) {
                    String key = childSnapshot.getKey();
                    if (childSnapshot.hasChild("status")) {
                        String status = childSnapshot.child("status").getValue(String.class);

                        if (status != null) {
                            //set status to "Cancelled"
                            //alert dialog
                            AlertDialog.Builder builder = new AlertDialog.Builder(ListofReserve.this);
                            builder.setTitle("Cancel Reservation");
                            builder.setMessage("Are you sure you want to cancel this reservation?");
                            builder.setPositiveButton("Yes", (dialog, which) -> {
                             if (status.equals("Cancelled")) {
                                 Toast.makeText(ListofReserve.this, "Reservation already cancelled", Toast.LENGTH_SHORT).show();
                             } else {
                                 DatabaseReference specificReservationRef = reservationsRef
                                         .child(reservation.getName())
                                         .child(key);

                                 specificReservationRef.child("status").setValue("Cancelled")
                                         .addOnCompleteListener(task -> {
                                             if (task.isSuccessful()) {
                                                 Toast.makeText(ListofReserve.this, "Reservation Cancelled", Toast.LENGTH_SHORT).show();
                                             } else {
                                                 Toast.makeText(ListofReserve.this, "Failed to cancel reservation", Toast.LENGTH_SHORT).show();
                                             }
                                         });
                             }
                            });
                            builder.setNegativeButton("No", (dialog, which) -> {
                                Toast.makeText(ListofReserve.this, " " + key, Toast.LENGTH_SHORT).show();
                            });
                            builder.create().show();
                        } else {
                            Toast.makeText(ListofReserve.this, "Status not available", Toast.LENGTH_SHORT).show();
                        }
                    } else {
                    }
                }
            } else {
                Toast.makeText(ListofReserve.this, "Reservation not found", Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Toast.makeText(ListofReserve.this, "Error fetching data: " + databaseError.getMessage(), Toast.LENGTH_SHORT).show();
        }
    });
}

您可能需要实现 RecyclerView：

private class ReservationAdapter extends RecyclerView.Adapter<ReservationAdapter.ReservationViewHolder> {

    private List<Reservation> reservations;
    private ActivityResultLauncher<Intent> activityResultLauncher;

    public ReservationAdapter(List<Reservation> reservations, ActivityResultLauncher<Intent> activityResultLauncher) {
        this.reservations = reservations;
        this.activityResultLauncher = activityResultLauncher;
    }


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

    @Override
    public void onBindViewHolder(@NonNull ReservationViewHolder holder, int position) {
        Reservation reservation = reservations.get(position);
        holder.reservationName.setText(reservation.getName());
        holder.reservationStatus.setText("Status: " + reservation.getStatus());
        holder.reservationDate.setText("Date of Reservation: " + reservation.getDate());

        holder.itemView.setOnClickListener(v -> {
            //show a dialog with options to cancel or reschedule
            showReservationOptionsDialog(reservation);
        });
    }