How can I add data from the Firebase database in a reversed order? [closed] - firebase

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I am currently developing a chat app. The problem is, that when someone types something it shows randomly on the chat screen (after a user registered and logged in).
I want it to look like a normal chat app, so the last message should be at the bottom of the screen. I even reversed the data and list view, but it didn't work.
My code:
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:naber/constants.dart';
final _firestore=FirebaseFirestore.instance;
User loggedInUser;
class ChatScreen extends StatefulWidget {
static String id="chat_screen";
#override
_ChatScreenState createState() => _ChatScreenState();
}
class _ChatScreenState extends State<ChatScreen> {
final messageTextController = TextEditingController();
final _auth = FirebaseAuth.instance;
String messageText;
void initState(){
super.initState();
getCurrentUser();
}
void getCurrentUser()async{
try{
final currentUser = await _auth.currentUser;
if(currentUser!=null){
loggedInUser=currentUser;
}
}
catch(e){
print(e);
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: null,
actions: <Widget>[
IconButton(
icon: Icon(Icons.close),
onPressed: () {
_auth.signOut();
Navigator.pop(context);
}),
],
title: Text('Chat'),
backgroundColor: Colors.lightBlueAccent,
),
body: SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
MessagesStream(),
Container(
decoration: kMessageContainerDecoration,
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Expanded(
child: TextField(
controller: messageTextController,
onChanged: (value) {
messageText = value;
},
decoration: kMessageTextFieldDecoration,
),
),
FlatButton(
onPressed: () {
messageTextController.clear();
_firestore.collection('messages').add({
'text': messageText,
'sender': loggedInUser.email,
});
},
child: Text(
'Send',
style: kSendButtonTextStyle,
),
),
],
),
),
],
),
),
);
}
}
class MessagesStream extends StatelessWidget {
#override
Widget build(BuildContext context) {
return StreamBuilder<QuerySnapshot>(
stream: _firestore.collection('messages').snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Center(
child: CircularProgressIndicator(
backgroundColor: Colors.lightBlueAccent,
),
);
}
final messages = snapshot.data.docs.reversed;
List<MessageBubble> messageBubbles = [];
for (var message in messages) {
final messageText = message.data()['text'];
final messageSender = message.data()['sender'];
final currentUser = loggedInUser.email;
final messageBubble = MessageBubble(
sender: messageSender,
text: messageText,
isMe: currentUser == messageSender,
);
messageBubbles.add(messageBubble);
}
return Expanded(
child: ListView(
reverse: true,
padding: EdgeInsets.symmetric(horizontal: 10.0, vertical: 20.0),
children: messageBubbles,
),
);
},
);
}
}
class MessageBubble extends StatelessWidget {
MessageBubble({this.sender, this.text, this.isMe});
final String sender;
final String text;
final bool isMe;
#override
Widget build(BuildContext context) {
return Padding(
padding: EdgeInsets.all(10.0),
child: Column(
crossAxisAlignment:
isMe ? CrossAxisAlignment.end : CrossAxisAlignment.start,
children: <Widget>[
Text(
sender,
style: TextStyle(
fontSize: 12.0,
color: Colors.black54,
),
),
Material(
borderRadius: isMe
? BorderRadius.only(
topLeft: Radius.circular(30.0),
bottomLeft: Radius.circular(30.0),
bottomRight: Radius.circular(30.0))
: BorderRadius.only(
bottomLeft: Radius.circular(30.0),
bottomRight: Radius.circular(30.0),
topRight: Radius.circular(30.0),
),
elevation: 5.0,
color: isMe ? Colors.lightBlueAccent : Colors.white,
child: Padding(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 20.0),
child: Text(
text,
style: TextStyle(
color: isMe ? Colors.white : Colors.black54,
fontSize: 15.0,
),
),
),
),
],
),
);
}
}

Answer 1

You add messages with:
_firestore.collection('messages').add({
'text': messageText,
'sender': loggedInUser.email,
});
Firestore doesn't have any built-in default ordering for documents. If you want to be able to order the documents, you will need to add a value to each document to allow that.
For example, you could add a timestamp of when the document was created with:
_firestore.collection('messages').add({
'text': messageText,
'sender': loggedInUser.email,
'createdAt': FieldValue.serverTimestamp()
});
By using FieldValue.serverTimestamp() the server will automatically populate this field, which you can then use when reading the data with:
stream: _firestore.collection('messages').orderBy('createdAt', descending: true).snapshots()