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How to builda Dart and Firebase app
in 30 mins
Jana Moudra @Janamou +JanaMoudra
Hi!
Co-Founder at
GDE for
Teacher
+ =
Makes me productive
I just sit and write the code
I know what’s happening
Me and ?
Makes me productive
I just sit and write the code
I know what’s happening
I can build great apps!
Me and ?
Great apps need a backend!
Needed
Lots of implementation
Eh, backend?
Database File Upload User accounts
Anonymous user OAuth Hosting ...
Needed
Lots of implementation
Eh, backend?
Database File Upload User accounts
Anonymous user OAuth Hosting ...
For a simple app...
OMG, backend!
... backendwithout
implementing BACKEND ...
???
Whatcan we do?
Hello Firebase!
Firebase
Realtime database
Authentication
Cloud storage
Hosting
...
+
firebase3 package
JS interop
Wrapper
Types
// Removes data at locationtry { await childRef.remove();} catch (e) { print("Error while deleting item, $e");}
Futures
// When auth state changesauth() .onAuthStateChanged .where((e) => e.user != null) .listen((e) { User u = e.user; ... });
Streams
// Updates data in a transactionawait childRef.transaction((value) => newValue);
Methods
// Updates data in a transactionawait childRef.transaction((value) => newValue);
Methods
No allowInterop()
DEMO
HOW to buildan app like this?
import 'package:firebase3/firebase.dart';
Import Firebase3!
Realtime database
Authentication
Cloud storage
Hosting
+
Realtime database?
{ "notes" : { "-KUsbAq6445-ynO4lg6Z" : { "img_url" : "https://firebasestorage.googlea...", "text" : "Is awesome!", "title" : "Dart" }, ... }}
Structure your data
databaseRef.onChildAdded.listen((e) { DataSnapshot data = e.snapshot; Map val = data.val(); Note note = new Note(val[jsonTagText]); _showNote(note);});
Load your data
try { await databaseRef .push({"text": "Hi"}) .future;} catch (e) { ...}
Save your data
Realtime databasein 15 minutes
Authentication?
var provider = new GoogleAuthProvider();try { await auth().signInWithPopup(provider);} catch (e) { ...}
Google provider
auth().currentUser
Current user
// Registers user with e-mail and passwordawait auth() .createUserWithEmailAndPassword( "[email protected]", "pass");
E-mail provider
Authentication in 5 minutes
Cloud storage
File file = ...;try { UploadTaskSnapshot snapshot = await storageRef .child(file.name) .put(file) .future; _showUploadImage(snapshot.downloadURL);} catch (e) { ...}
Image upload
Cloud storage in 10 minutes
+
pub.dartlang.org/packages/firebase3
github.com/Janamou/firebase3-dart
Where can I get it?
You can alsobuild an app like this
Jana Moudra @Janamou +JanaMoudra
