小编Mat*_*ner的帖子

我将 flutter 与包 firebase_database 一起使用。随着代码

final FirebaseDatabase _database = FirebaseDatabase.instance;

@override
void initState() {
  super.initState();
  _newsList = new List();

  _newsQuery = _database
     .reference()
     .child('news')
     .orderByChild('published')
     .limitToFirst(10);

  _newsQuery.onChildAdded.listen(_onEntryAdded);
}

_onEntryAdded(Event event) {
  setState(() {
    News n = News.fromSnapshot(event.snapshot);
    _newsList.add(n);
  });
}

我得到了_newsList所有查询项目的完美列表。新闻类是

 import 'package:firebase_database/firebase_database.dart';

 class News {
   String key;
   String image;
   String text;
   String title;
   String published;

   News(this.image, this.text, this.published);

   News.fromSnapshot(DataSnapshot snapshot) :
     key = snapshot.key,
     text = snapshot.value["text"],
     title = snapshot.value["title"],
     image = snapshot.value["image"],
     published = snapshot.value["published"];

   toJson() …