This presentation contains an introduction to Firebase and walks through a code-lab for creating a real-time Android Chat application with offline functionality.

1. BUILDING REALTIME MOBILE APPS WITH FIREBASE
Moyinoluwa ADEYEMI
November 28, 2015

2. Firebase is a powerful platform for building realtime feature-rich apps

3. Realtime Database
NoSQL JSON data store
Cross-platform client-side
SDKs
Restful API
Works Offline
Auto-scaling

4. Authentication
Anonymous
Email / password
Social
Custom

5. Hosting
Free static asset hosting
SSL certificate
Global CDN
Single command deploys
One-click rollbacks
Custom domains

6. So you want to learn how to build a
realtime mobile chat application with Firebase?

8. Sign up on https://www.firebase.com/ to get a firebase (data) url

9. Add the library dependency directly to your app’s gradle.build file
In cases of build errors caused by duplicate files, exclude those files by
adding these too

10. Connect your app to Firebase

11. Edit your AndroidManifest.xml file
First, request an INTERNET permission in the <manifest> tag
Next, change the name of the application

12. Create a Chat Model class

13. Send a message to Firebase
Create a new Activity, complete with a layout that looks better than this.
Be sure to add a <ListView />, an <EditText /> for collecting messages
and a <Button /> for sending the data.

14. Send a message to Firebase
Create a reference to Firebase in the Activity and insert your own
firebase url.

15. Send a message to Firebase
Retrieve the text from the EditText and push to Firebase

16. Retrieve a message from Firebase
Create a layout for the chat. It could look like this, or even better

17. Retrieve a message from Firebase
Create a ChatAdapter class that extends FirebaseListAdapter

18. Retrieve a message from Firebase
Create a ChatAdapter class that extends FirebaseListAdapter

19. Retrieve a message from Firebase
Override onStart() in MainActivity to read and display the messages

20. Retrieve a message from Firebase
Override onStop() in MainActivity to remove all the data

21. Implement offline functionality with Firebase
With just one line of code… seriously

22. Woohoo!!!
You now have a very basic Firebase app that sends, receives, displays
messages and functions offline.

23. Credits
The official Firebase Chat App example was modified to produce this app.
The complete app including Login functionality implemented with
Firebase is available on Github here:
https://github.com/moyheen/LagosFirebaseCodelab

24. Twitter LinkedIn Github
Moyinoluwa ADEYEMI
Thank You!