This document summarizes a meetup on Firebase hosted by Amrit Sanjeev. It introduces Firebase and its features including realtime database, user authentication, hosting, and security. It provides code examples for adding Firebase dependencies, reading and writing data to the realtime database, and enabling offline support. The document also discusses Firebase's reliability, data retention policies, and security measures.

1. Post IO Meetup
Introduction to Firebase
Amrit Sanjeev
Organizer, Blrdroid

2. Who am I ?

4. What is firebase
Realtime Database User Management Hosting
Realtime Application Platform

5. Real time database
● NoSQL, JSON database
● Maps each piece of data to a URL
● Pushes updates in milliseconds
when things change

6. ● seemless offline support
● automatic sync on network
acccess
Offline support

7. ● Automatically syncs to
the server and pushes
to other devices when
network comes back
Offline support

8. Drop-in support for login with
● Email & Password
● Common OAuth providers
○ Google
○ Facebook
○ Twitter
○ Github
● Your own custom auth tokens
Auth and user management

9. Static hosting
Production grade static-asset hosting service
● SSL Certificate included!
● Backed by a global CDN
● Launch with: firebase deploy
● One click rollbacks from our dashboard

10. Security Considerations
● Namespace sandboxing
● HTTPS + 2048-bit SSL
● BCrypt for passwords (not stored directly in the
Firebase)
● Security rules stored and executed server side

11. Reliability and Data retention
● SLA is 99.95%
● Check on status.firebase.com
● Consistency model guarantees write persistence
● Three tiered backups, every 24 hours
● Private customer backup to GCS/S3

12. Now let’s find out
how much code it is to
implement

13. Add firebase support
In build.gradle
dependencies {
compile 'com.firebase:firebase-client-android:2.3.0+'
}
In Android manifest
<uses-permission android:name="android.permission.INTERNET" />
In Android application or activity
@Override
public void onCreate() {
super.onCreate();
Firebase.setAndroidContext(this);
}

14. Data store
Creating a reference
Firebase rootRef = new Firebase("https://docs-examples.firebaseio.com/web/data");
Directly access child nodes in the data
Firebase rootRef = new Firebase("https://docs-examples.firebaseio.com/web/data/users/mchen/name");
Using the Child() api call
Firebase rootRef = new Firebase("https://docs-examples.firebaseio.com/web/data");
rootRef.child("users/mchen/name");

15. ● setValue( ) Write or replace data to a defined path, like messages/users/<username>
● updateChildren( ) Update some of the keys for a defined path without replacing all of the data
● push( ) Add to a list of data in your Firebase database.
● runTransaction( ) Use our transactions feature when working with complex data
Firebase usersRef = ref.child("users");
Map<String, User> users = new HashMap<String, User>();
users.put("alanisawesome", alanisawesome);
users.put("gracehop", gracehop);
usersRef.setValue(users);
Saving data

16. Retrieving data
● Attach an asynchronous listener to a Firebase reference.
● The listener will be triggered
○ once for the initial state of the data
○ again anytime the data changes
Firebase ref = new Firebase("https://docs-examples.firebaseio.com/web/saving-data/fireblog/posts");
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
System.out.println(snapshot.getValue());
}
@Override
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});

17. Offline support
Adding offline support
Firebase.getDefaultConfig().setPersistenceEnabled(true);
Keeping data refresh
Firebase scoresRef = new Firebase("https://dinosaur-facts.firebaseio.com/scores");
scoresRef.keepSynced(true);

18. Thank you!
Amrit Sanjeev
@amsanjeev
www.blrdroid.org