从Firebase接收新数据时遇到问题?

时间:2019-04-08 15:07:26

标签: java android firebase firebase-realtime-database

我正在运行我的应用程序并将一个新的子代添加到firebase中,您可以在线查看该子代的所有值,但是数据快照只会获取添加的新子代的第一个值。

我们尝试分别读取每个子值,但似乎数据快照甚至都不知道它们的存在。

public static void NotifyToTripList(final NotifyDataChange<List<Trip>> notifyDataChange) {
    if (notifyDataChange != null) {
        if (tripRefChildEventListener != null) {
            notifyDataChange.onFailure(new Exception("first unNotify trip list"));
            return;
        }

        tripList.clear();
        tripRefChildEventListener = new ChildEventListener() {
            @override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {                   
                Trip t=new Trip();
                t.setTripID(dataSnapshot.getKey());
                if(dataSnapshot.child("DriverID").getValue()!=null) t.setDriverID(Long.parseLong(dataSnapshot.child("DriverID").getValue().toString()));
                else t.setDriverID(0L);
                t.setDestination(dataSnapshot.child("Destination").getValue().toString());
                t.setCurrentLocation(dataSnapshot.child("CurrentLocation").getValue().toString());
                t.setPassengerEmail(dataSnapshot.child("PassengerEmail").getValue().toString());
                t.setPassengerNumber(dataSnapshot.child("PassengerNumber").getValue().toString());
                t.setPassengerName(dataSnapshot.child("PassengerName").getValue().toString());
                SimpleDateFormat format = new SimpleDateFormat("HH:mm"); 
                tripList.add(t);
                notifyDataChange.OnDataChanged(tripList);
        }
    }
}

主菜单中的代码:

FireBaseDataBase.NotifyToTripList(new FireBaseDataBase.NotifyDataChange<List<Trip>>() {
    @Override
    public void OnDataChanged(List<Trip> obj) {
        FireBaseDataBase.tripList = obj;
    }

    @Override
    public void onFailure(Exception exception) {
        Toast.makeText(getBaseContext(), "error to get trips list\n" + exception.toString(), Toast.LENGTH_LONG).show();
    }
});

这是普通的骑行数据快照的样子:

  

DataSnapshot {键= -LbbpVoPNgUDi-0eTDRY,值= {目的地= Mordehai A'liash 6,耶路撒冷,DriverID = 666666666,PassengerNumber = 0535291683,PassengerName = chana Gross,PassengerEmail = chanatriplet @ gmail.com,PickUpTime = 12: 20:00,CurrentLocation = Beit Ha-Defus 7,Jerusalem,TripStatus = DONE,DropOffTime = 21:06:04}}

这是新游乐设施数据快照的样子:

  

DataSnapshot {键= -Lbwu6QnvcvTZQuPsNEI,值= {CurrentLocation =药物,特拉维夫}}

这是数据库结构的样子: click here

0 个答案:

没有答案