Problem converting FirebaseAuth.instance.currentUser to Future in Flutter FutureBuilder

Question

I am new to flutter and have taken this course which uses an older version of FirebaseAuth that returns FirebaseAuth.instance.currentUser() as future to FutureBuilder. Now with new version FirebaseAuth.instance.currentUser is a User not a Future. How can I change the code to make it work?
Here is the page code:

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';

import '../chat/message_bubble.dart';

class Messages extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
      future: FirebaseAuth.instance.currentUser,
      builder: (ctx, futureSnapshot) {
        if (futureSnapshot.connectionState == ConnectionState.waiting) {
          return const Center(
            child: CircularProgressIndicator(),
          );
        }
        return StreamBuilder(
          stream: FirebaseFirestore.instance
              .collection('chat')
              .orderBy('createdAt', descending: true)
              .snapshots(),
          builder: (ctx, chatSnapshot) {
            if (chatSnapshot.connectionState == ConnectionState.waiting) {
              return const Center(
                child: CircularProgressIndicator(),
              );
            }
            final chatDocs = (chatSnapshot as AsyncSnapshot).data.docs;
            return ListView.builder(
              reverse: true,
              itemCount: chatDocs.length,
              itemBuilder: (ctx, index) => MessageBubble(
                chatDocs[index]['text'],
                chatDocs[index]['userId'] ==
                    (futureSnapshot as dynamic).data.uid,
              ),
            );
          },
        );
      },
    );
  }
}

I appreciate your help. Thanks a lot!

Answer 1

I concluded that I do not need the FutureBuilder and removed it. Here is the final code:

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';

import '../chat/message_bubble.dart';

class Messages extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: FirebaseFirestore.instance
          .collection('chat')
          .orderBy('createdAt', descending: true)
          .snapshots(),
      builder: (ctx, chatSnapshot) {
        if (chatSnapshot.connectionState == ConnectionState.waiting) {
          return const Center(
            child: CircularProgressIndicator(),
          );
        }
        final chatDocs = (chatSnapshot as AsyncSnapshot).data.docs;
        return ListView.builder(
          reverse: true,
          itemCount: chatDocs.length,
          itemBuilder: (ctx, index) => MessageBubble(
            chatDocs[index]['text'],
            chatDocs[index]['userId'] == FirebaseAuth.instance.currentUser!.uid,
          ),
        );
      },
    );
  }
}

I hope this helps others who are looking for an answer.

Answer 2

Future<void> data() async {
      return FirebaseAuth.instance.currentUser;
    }

    return FutureBuilder(
        future: data(),
        builder: (ctx, futureSnapShot) {
          if (futureSnapShot.connectionState == ConnectionState.waiting) 
          {
            return CircularProgressIndicator();
          }
          return ListView.builder(
            reverse: true,
            itemCount: chatDocs.length,
            itemBuilder: (ctx, index) => MessageBubble(
              chatDocs[index]['text'],
              chatDocs[index]['userId'] ==
                  FirebaseAuth.instance.currentUser.uid,
            ),
          );
        });