Question

我遇到以下问题。我有一个Firebase数据库，其中存储有关房间的信息。只有在满足某些条件并且可以提供所要求的日期时，我才需要添加房间预订。我设法做到了，并保留了一个以“ no”开头的变量“ alreadyBooked”，但如果条件不正确，它将变为“ yes”。但是，尽管我的if语句中有Logs并且可以访问，但我的变量永远不会成为yes。

private View.OnClickListener bookEvent() {
    return new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Long roomNumber=type.getSelectedItemId()+1;
            room="Room"+roomNumber;
            Log.d("Db room to update",room);
            ref_rooms=database.getReference("Rooms");
            req_ref_room=database.getReference("Rooms").child(room);
            alreadyBooked="no";
            req_ref_room.addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    for(DataSnapshot dsp:dataSnapshot.getChildren())
                    {
                            String id = dsp.getKey();
                            DatabaseReference book_ref = FirebaseDatabase.getInstance().getReference("Rooms").child(room).child(id);
                            book_ref.addListenerForSingleValueEvent(new ValueEventListener() {
                                @Override
                                public void onDataChange(DataSnapshot dataSnapshot) {
                                    Book book = dataSnapshot.getValue(Book.class);

                                    @SuppressLint("SimpleDateFormat") SimpleDateFormat smt = new SimpleDateFormat("dd/mm/yyyy");
                                    try {
                                        Date book_checkin_date = smt.parse(book.getCheckin());
                                        Date book_checkout_date = smt.parse(book.getCheckout());
                                        Date user_checkin_date = smt.parse(checkin.getText().toString());
                                        Date user_chekout_date = smt.parse(checkout.getText().toString());

                                        if (user_checkin_date.after(book_checkin_date) && user_checkin_date.before(book_checkout_date) ||
                                                (user_chekout_date.after(book_checkin_date) && user_chekout_date.before(book_checkout_date)) ||
                                                (user_checkin_date.before(book_checkin_date) && user_chekout_date.after(book_checkout_date)) ||
                                                (user_checkin_date.before(book_checkin_date) && user_chekout_date.after(book_checkin_date)) ||
                                                (user_checkin_date.before(book_checkout_date) && user_chekout_date.after(book_checkout_date))) {
                                            alreadyBooked = "yes";
                                        }

                                    } catch (ParseException e) {
                                        alreadyBooked = "yes";
                                        e.printStackTrace();
                                    }
                                }

                                @Override
                                public void onCancelled(DatabaseError databaseError) {
                                }
                            });

                    }

                    if(alreadyBooked.equals("no"))
                    {
                        Toast.makeText(getContext(),"Success",Toast.LENGTH_LONG).show();
                        ref_rooms.child(room).push().setValue(new Book(auth.getUid(),checkin.getText().toString(),checkout.getText().toString(),200));
                    }
                    else
                    {
                            Toast.makeText(getContext(),"Declined",Toast.LENGTH_LONG).show();
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });


        }

    };
}

为什么“已经预订”始终为否？

仅在必要时将对象添加到Firebase数据库

0 个答案: