java - Android Studio Firebase updateChildren

Question

大家好。我在 Android Studio 和 Firebase 中遇到了困难，每当我尝试使用 updateChildren 时，它都会不断替换旧的。我认为它会保留节点内的旧数据，这是代码:

private void getClosestDriver() {
    DatabaseReference driverLocation = FirebaseDatabase.getInstance().getReference().child("driversAvailable");
    GeoFire geoFire = new GeoFire(driverLocation);

    geoQuery = geoFire.queryAtLocation(new GeoLocation(pickupLocation.latitude, pickupLocation.longitude), radius);

    geoQuery.removeAllListeners();

    geoQuery.addGeoQueryEventListener(new GeoQueryEventListener() {
        @Override
        public void onKeyEntered(String key, GeoLocation location) {
            if (!driverFound && requestBol) {
                driverFound = true;
                driverFoundID = key;

                DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Users").child("Driver").child(driverFoundID).child("passengerRequest");
                String passengerID = FirebaseAuth.getInstance().getCurrentUser().getUid();

                HashMap map = new HashMap();
                map.put("passengerRideID", passengerID);
                map.put("destination", destination);
                ref.updateChildren(map);

                getDriverLocation();
                mRequest.setText("Looking for Bus Location....");
            }
        }

我对 HasMap 的做法正确吗？

Answer 1

将其更改为

String passengerID = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Users").child("Driver").child(driverFoundID).child("passengerRequest").child(passengerID);


            HashMap map = new HashMap();
            map.put("destination", destination);
            ref.updateChildren(map);