Download pptx - Getting Started: Google Glass Apps with GDK

Developing Glass Apps Using GDK (XE12 Update) Follow me @chuazy

Photo credit: TheVerge.com


About myself

Chua Zi Yong

Developing Android for about 5 years

Founder of Stream Media

Founder of CodeAndroid Singaporehttps://www.facebook.com/groups/codeandroid/


What we will cover today on Glass

This session will cover more on high level development consideration – less emphasis on design and technical discussions

Introduction FrameworkConstraints

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Basics of Google Glass


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What is Glass? How to use Glass?

How it Feels [through Google Glass]_hd720.mp4 Google Glass How to use Glass hands-free_hd720.mp4


Getting Started: https://developers.google.com/glass/

1) Take note of the design principles (very small screen!)

2) Choose your poison: Mirror API or GDK

3) Check out the samples and demos


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https://developers.google.com/glass/




Developing with GDK

1) Run from Glass itself (offline!) unlike Mirror API

2) Based on Android 4.0.2, apps compiled as APK

3) Download using ADT (GDK Sneak Peak)


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How is GDK related to Android development?


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You can port your Android code and redesign the interface for Glass, supposedly - At this stage, not everything works, e.g. Play Services, default Share API


How is your app triggered?


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- Command line (that’s how it was done in XE11)

- Voice trigger


Voice trigger


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- Voice trigger is used to launch your app

- You can use any commands during development

- Glassware only support standard set of voice commands (https://developers.google.com/glass/develop/gdk/input/voice)

- You can submit new commands for approval (which you will hear back in around 2 weeks)

https://developers.google.com/glass/develop/gdk/input/voice




Contextual voice commands


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- Sometimes, voice commands is more than “Take a Picture”

- Add voice prompt in voicetrigger.xml (“Ok glass, get directions to, home”)

<?xml version="1.0" encoding="utf-8"?><trigger keyword="@string/glass_voice_trigger"> <input prompt="@string/glass_voice_prompt" /></trigger>


3 types of interfaces


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Static Cards – appear to the right of Timeline

Right now it does nothing except “show you something”- Please help upvote issue 320 https://code.google.com/p/google-glass-api/issues/detail?id=320


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Static cards

https://code.google.com/p/google-glass-api/issues/detail?id=320




Live Cards – appear to the left of Timeline - “live” interaction and card can update itself- User can interact with other cards while active


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Live cards


Immersions – takes over the whole screen- Like a normal Android app- Outside of Timeline- User cannot interact with cards unless they close your app


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How to use the Interfaces- Immersion – standard Android app architecture

- Static Card – use TimelineManager from either running app or service (insert, update, query, delete)

- Live Card – will talk more next slide


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Live Card Architecture- Unlike an app, your default launch is a Live Card Service- Keeps on running- Need to create pendingintent to launch menu activity to

close the live card- 2 types of rendering – Low and Hi Frequency


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Live Card Architecture – Low Frequency Rendering- Small set of views and low update rate- For example, match score


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Launch live card service

User says “Ok Glass, <trigger>

Remote View

Live Card


Live Card Architecture – High Frequency Rendering- Dynamic rendering- For example, timer


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Launch live card service

User says “Ok Glass, <trigger>

Drawing Logic, other services

SurfaceView

Live Card


Other things to take note of- You can specify touch gestures (like a D-Pad)- Sensors: Voice Input, GPS, Accelerometer,, Camera- Glass heats up very fast and have low battery life

- Design your app to be as light weight as possible to reduce load

- Continuous video recording is about 45-60 minutes


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See some code?


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What is available by default- Google Search- Call/SMS/Hangout- Get Directions/POI Searches- Take Picture/Video- Google Music- Gmail- Google Now….


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What interesting apps developers are building- Wolframalpha - “OK Glass, Compute, Population of

Finland”


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What interesting apps developers are building- DriveSafe – Detects if you are dozing while driving and

give directions to nearest rest area


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What interesting apps developers are building- WeMoGlass – Control Belkin WeMo devices at home


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What limits developers right now?- Band-Aid everywhere – check issues often on the project

page, may take time to fix- E.g. mediascanner only works on reboot, share not working,

no GCM

- Certain features are Mirror API only, notification, action for static cards

- No emulator


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Resources for developers- Main Page https://developers.google.com/glass/- Project Home (https://code.google.com/p/google-glass-api/) for

list of bugs and upcoming enhancements- Stackoverflow (http://

stackoverflow.com/questions/tagged/google-gdk)- Unofficial Glassware list (http://

glass-apps.org/google-glass-application-list)


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https://code.google.com/p/google-glass-api/



http://stackoverflow.com/questions/tagged/google-gdk

http://stackoverflow.com/questions/tagged/google-gdk

http://glass-apps.org/google-glass-application-list




Getting Glass- USD$1500 + tax- Must be over 18 and resident of United States- Must self collect at Google Office either in NYC or SF

- Choose color- Go through fitting process- Setup on your phone

- Need to get invite from Google (Register your interest through http://www.google.com/glass/)


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What if I can’t get Glass?- You can emulate Glass on your Android device with the

instructions from http://www.elekslabs.com/2013/11/google-glass-development-without-glass.html (Or search “Glass development without Glass”, 3rd result)

- You can emulate the screen resolution on your device (caution: please get familiar with adb commands before you try)- Above 4.3: adb shell wm size 640x360- Below 4.3: adb shell am display-size 640x360


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http://www.elekslabs.com/2013/11/google-glass-development-without-glass.html




Questions?


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