Thursday, September 15, 2011

Google DevFest 2011 - Bangalore!


Atlast, I attended a professional developer meet! And it couldn't be better. It was the Google Developer Fest organized by Google at Lalit Ashok Hotels, Bangalore. Most of the speakers were from Google headquarters, working on key Google products like Android, Chrome, Maps and App Engine.



The registration process went on very easily as they had a QR code in the confirmation mail, and used an android phone to take a picture of the same and verify the registration. Also, they had queues based on alphabets range. The T-Z queue was empty while the other queues were having atleast 20 to 30 people in it. For the first time in my life, i experienced an advantage of my name starting with V!

In this post, I am sharing the raw notes which i took during the keynote and various other talks. Hope this will be of some use.




Keynote - Android
* 550k+ activations per day
* Complex Screen density vs Size matrix - unifying everything => android
* Always use DPI (density per square inch) for specifying assets
* Honeycomb features
* Fragments
* Loaders - wrapper on top of asynctask
* Action bar
* Tabs
* Animation framework
* Compatibility library
* Multiple APK Support

Keynote - Bleeding edge HTML5 - http://india-devfest-keynote.appspot.com
* Interestingly, this keynote isn't called as "Chrome", though most of the topics were Chrome specific
* 160M active users
* Page Visibility API
* Prerendering
* Offline capabilities
* Web animation - CSS3, WebGL
* Native Client
* Future
* Web intents
* Fullscreen content - Fullscreen API
* Web Audio API - Real time processing and analysis of audio
* WebRTC - Real time communication
* Be updated
* chromestatus.com
* updates.html5rocks.com



Android Market - Tony Chan
* 250k + apps, 6B+ downloads
* In app billing, carrier billing
* Licensing
* All licenses allowed
* Code Obfuscation
* Don't reuse sample code
* In app billing
* Sell only digital content
* Reports for developers
* Device Filter
* Ability to exclude handpicked devices
* Multiple APK
* Filter by specific segments (platform version, screen size, etc.)
* App available as one product listing
* Apps upto 4GB coming soon (50mb app + 2gb archive)
* Pay attention to graphics - Featuring in android market depends mainly on that

Android Fragments & Open Accessory ADK - Tony Chan
* Fragments
* Fragments need not always have UI
* Fragments are an investment for the future!
* Fragments vs <include/>
* Fragments (optional UI, has lifecycle, not standalone, no direct interaction with intents) vs Activity
* Open accesory & ADK
* USB Device basics (Descriptor, etc)
* Open Accessory -> A USB host device that can communicate with an android device (e.g. Arudino)
* Use Android Accessory Protocol for communication

Building Integrated Apps on Google Cloud Technologies - Alfred Fuller
* App Engine intro
* Google Storage
* Store data in google's cloud
* Access via RESTful API
* Objects of any type (100GB / object)
* OAuth / Web browser
* Prediction API
* Machine learning API
* Upload training data -> Build model -> Predict new data
* Many machine learning techniques, Asynchronous training, Many platforms access
* BigQuery
* Analyze massive amounts of data in seconds
* SQL like query language, REST, RPC, etc.
* Batch jobs (Mapreduce)
* App Engine Identity API (For secure authentication)

Google Apps Marketplace - Claudio Cherubino
* Google Apps as a pure platform
* Google Apps APIs
* Success Stories
* OpenID SSO & OAuth
* Provisioning API
* Gmail contextual gadgets
* Sidebar gadgets in Gmail/Calendar
Twitter: @ryguyrg @scottmcmullan @stevenbazyl

Chrome Developer Tools - Boris Smus
* Basics - Cheat Sheet
* Revision history for all changes made inline in dev tools
* Aim to transform this into an IDE
* Commandline API - console.log takes n parameters, copy(), inspect() and $0
* Javascript debugging - See call stack, Pretty print
* Breakpoints - Line, Conditional, Exception, DOM, Event, XHR
* Future
* Extensions can extend developer tools too!
* Use chromiumer
* Remote debugging (--remote-debugging-port=31337 , Blackberry PlayBook only)



Google Places API - Chris Broadfoot
* What is a Place -> Abstract & Concrete
* Available as a web service and as a part of javascript maps library

Designing UIs for Phones and Tables
* UI Patterns for Honeycomb
* Action Bar
* App Icon - Where am i?
* View details - What can i see?
* Action buttons - What can i do here?
* Multi Pane Layouts
* Take advantage of screen real estate
* Consolidate multiple related screens into a compound view (similar to iframe in web)
* Screen rotation handling - Stretch (Settings), Stack (Calendar), Expand/Collapse (Gtalk), Show/Hide (Gmail)
* App Navigation
* Beyond the List
* Think and use innovative UIs to replace traditional lists (carousel, slidestack, etc.)
* Do's
* Aim for single APK
* Use compatibility library
* Customize visual design completely, if straying from Holo theme
* Support both landscape and portrait
* Extract dimensions for phones and tablets
* Use theme/style/etc. to reduce redundancy
* Marry OS visual style with your brand
* Don'ts
* Assume API level >= 11 (tablet)
* Assume xlarge == tablet (7" inch tablet is large)
* Use small font sizes
* Overuse fill_parent; Avoid excessively long lines of text
* Think tablets are big phones

Btw, the lunch was awesome too! :-P Overall, a great experience! :-)

-Vignesh