Firebase实时数据库数据读取异常：findTime函数问题排查与修复

我编写的findTime函数逻辑为：遍历每位用户日程的前200天，逐个检查某天是否全员有空——用户当天有空则计数器递增，当计数器数值与用户总数匹配时，将指定事件添加至用户日程。但目前函数无法正确从Firebase实时数据库读取数据，导致功能失效。

函数代码 #

private void findTime(String eventName, int EventTime)
{
    Boolean dayFound = false;
    countNeeded = TheUserList.size();

    DaySearched = LocalDate.now();
    while (!dayFound) {
        for (int i = 0; i < 200; i++)
        {
            // currentCount记录当天有空的用户数量
            currentCount = 0;
            Toast.makeText(this, ("The first for loop has begun " + String.valueOf(currentCount)), Toast.LENGTH_SHORT).show();

            for (int e = 0; e < TheUserList.size(); e++)
            {
                String currentUser = TheUserList.get(e);
                Log.i("Firebase", Login.reference.child(currentUser).child(String.valueOf(DaySearched)).child("Time for day").toString());

                Login.reference.child(currentUser).child(String.valueOf(DaySearched)).child("Time for day").addValueEventListener(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot snapshot) {
                        int TimeForDay = snapshot.getValue(int.class);
                        if (TimeForDay + EventTime < 1441)
                        {
                            currentCount = currentCount + 1;
                        }
                        else
                        {
                            currentCount = 0;
                        }
                    }

                    @Override
                    public void onCancelled(@NonNull DatabaseError error) {
                        Toast.makeText(PlanEvent.this, "Failed to get Data", Toast.LENGTH_SHORT).show();
                    }
                });
            }
            if (currentCount == countNeeded)
            {
                Log.d("FindTime Function", "Found and available day at" + String.valueOf(DaySearched));

                Tasks newEvent = new Tasks(eventName, DaySearched, LocalTime.now(), EventTime);
                Day.enoughTimeChecker(DaySearched, EventTime, newEvent);
                dayFound = true;
            }
            DaySearched = DaySearched.plusDays(1);
        }
    }
}

排查情况 #

• 已通过Toast验证while循环正常执行，但提示找到合适日期的Log从未触发，推测是无法读取Firebase数据导致判断逻辑失效。
• 附Firebase实时数据库结构截图及Log.i()输出截图，请求协助排查问题。

内容的提问来源于stack exchange，提问作者Suf1an65