Difference between revisions of "Tims GoogleIO 2011 Notes"
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Revision as of 11:18, 13 May 2011
Here are some random notes from Google I/O 2011 sessions that I (Tim Bird) attended:
Contents
Day 1 Keynote
100,000 million activations, 400,000 activations per day, 200,000 apps, 4.5 billion app installs
Honeycomb 3.1 is coming - Xoom now, other tablets later, Google TV
Ice Cream Sandwhich coming Q4 - unified TV, tablet, phone OS, open source
movies on Android market books on Android market music beta - music manager instant mix moving pinning music - cache recently played music --- new devices - 18 month of updates --- 300 devices --- Android Open Accessory fitness demo arduino dev. board Android@home android compatible lights and hardware hub - project tungsten attendees get a Samsung tablet
Honeycomb highlights
Holo theme new - books, movie studio improved interface
renderscript tabbed browser fragments - like mini-activites use Android compability toolkit to get fragments for 1.6 platforms
system bar - always on, but can dim sometimes action bar - app home, menu, overflow menu contextual action bar renderscript
- Java program talks to it
- no JNI needed - variable access is automatic
init - called on startup root - called every frame return value = interface rate uses LLVM compiler
harware accelleration automatic (if turned on in manifest)
Developer Pro Tips
how to get features - be best and innovative
start activity based on API level
get user feedback
- send exceptions and use google analytics
- randomize user sets and test different features (like layouts)
read developer blog
- Fresh - use passive location provider
- Psychic - save user preference, to right thing (what user expects)
Android backup service re-install apps is device gets wiped
- Adaptive - display correct keyboard
- Smooth - no pauses - make everything asynchronous
- 60ms delay can cause visible jitter
Open Accessory SDK
devices with host mode now support USB keyboard & mouse, game controller explanation of host and device USB sides new 3.1 USB host protocol support accesory is host, device is on USB gadget side
manifest specific related accessories strings flow from host to device (includes URL - for web site or app related to accessory)
Fireside chat
no notes taken. Session was all Q&A.
Python
google app engine is python youtube used it a lot Django vs. Rails (pretty similar?) Twisted is pretty different
- Django = db-based web dev platform
- creates db manager interfaces automatically
Youtube used to use psycho, but doesn't any more
PyPy is sometimes more performant than C-Python Developer who worked on psycho now works on PyPy Guido doesn't consider psycho safe
Day 2 keynote
chrome is on 6-week release schedule speech being added tinkercad webgl = 100 times faster than canvase 2d
GST & eclipse for mobile apps
uibinder - mobile UI in any form factor
- firebug dev tool
- shows packet traces
web for google TV
2 million internet-connected TVs in 2010 43 million in 2014
4 main app areas:
- media consumption with social aspect
- apps that span devices
- casual games
- paired virtual controllers
drawing game with touch controller per person
10-foot UI only 720p or 1080p
overscan: action-safe=3.5%% away from edges title-safe=5-10%% away from edges
STAR: don't build to edges - have spacing and padding
it's easy to over-saturate - tone down oranges and reds
STAR: non-white background is better (white is like SHOUTING) black is a normal default background for TV
STAR: test contrast on a real TV
use big fonts, small text snippets, san serif
avoid scrolling, have very strong focus (DVD does this wrong a lot)
support arrow keys support back key correctly - use hash location
google TV auto-zooms - don't try to be pixel-perfect
design guide
- give visual feedback
- do motion
- (one other one)
TV ui templates available from google also UI libraries
code site and forum