Answers for "flutter firebase"

flutter firebase google auth

import 'package:firebase_auth/firebase_auth.dart';
import 'package:google_sign_in/google_sign_in.dart';

class GoogleAuth {
  final FirebaseAuth _auth = FirebaseAuth.instance;
  final GoogleSignIn googleSignIn = GoogleSignIn();

  User getUser() {
    return _auth.currentUser;
  }

  Future<String> getUserId() async {
    final User user = _auth.currentUser;
    final uid = user.uid;
    return uid;
  }

  Future<User> signInWithGoogle() async {
    final GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
    final GoogleSignInAuthentication googleSignInAuthentication =
        await googleSignInAccount.authentication;

    final AuthCredential credential = GoogleAuthProvider.credential(
      accessToken: googleSignInAuthentication.accessToken,
      idToken: googleSignInAuthentication.idToken,
    );

    final UserCredential authResult =
        await _auth.signInWithCredential(credential);
    final User user = authResult.user;

    assert(!user.isAnonymous);
    assert(await user.getIdToken() != null);

    final User currentUser = _auth.currentUser;
    assert(user.uid == currentUser.uid);

    print('signInWithGoogle succeeded: $user');

    return currentUser;
  }

  void signOutGoogle() async {
    await googleSignIn.signOut();
    print("User Sign Out");
  }
}

flutter firebase

$ dart pub add firebase

flutter firebase database

dependencies:  flutter:    sdk: flutter  firebase_database: 1.0.3

flutter firebase database

void createRecord(){
  databaseReference.child("1").set({
    'title': 'Mastering EJB',
    'description': 'Programming Guide for J2EE'
  });
  databaseReference.child("2").set({
    'title': 'Flutter in Action',
    'description': 'Complete Programming Guide to learn Flutter'
  });
}

how to add data in firebase in flutter

StreamBuilder(
    stream: _firebaseRef.onValue,
    builder: (context, snap) {

        if (snap.hasData && !snap.hasError && snap.data.snapshot.value != null) {

            Map data = snap.data.snapshot.value;
            List item = [];

            data.forEach((index, data) => item.add({"key": index, ...data}));

            return ListView.builder(
                    itemCount: item.length,
                    itemBuilder: (context, index) {
                    return ListTile(
                        title: Text(item[index]['message']),
                        trailing: Text(DateFormat("hh:mm:ss")
                            .format(DateTime.fromMicrosecondsSinceEpoch(
                                item[index]['timestamp'] * 1000))
                            .toString()),
                        onTap: () =>
                            updateTimeStamp(item[index]['key']),
                        onLongPress: () =>
                            deleteMessage(item[index]['key']),
                    );
                    },
                );
        }
        else
            return Text("No data");
    },
)