在android firebase中获取父节点 [英] Get parent node in android firebase

问题描述

这是我当前的代码.如何获得名字的父节点

This is my current code. How can I get the parent node of the first name

final Query userQuery = mRef.orderByChild("First Name");

    userQuery.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            map.clear();
            for (DataSnapshot child: dataSnapshot.getChildren())
            {
                String key = child.getKey().toString();
                String value = child.getValue().toString();
                map.put(key,value);
            }

推荐答案

您应该在检索到的dataSnapshot中调用getKey()方法:

You should call the getKey() method in your retrieved dataSnapshot:

  final Query userQuery = mRef.orderByChild("First Name");

  userQuery.addChildEventListener(new ChildEventListener() {
     @Override
     public void onChildAdded(DataSnapshot dataSnapshot, String s) {
        map.clear();
        //Get the node from the datasnapshot
        String myParentNode = dataSnapshot.getKey();
        for (DataSnapshot child: dataSnapshot.getChildren())
        {
           String key = child.getKey().toString();
           String value = child.getValue().toString();
           map.put(key,value);
        }

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