Google Mirror API, What is Google Glass, How to Develop for Google Glass, Android Developer guide to everything Google Glass, Glassware, Make the next big thing for Android, Live Cards, Past, Present and Future of Google Glass.
For Glass its now or never
Google+ on Glass shows a single card for each post, with a simple layout
and most content behind a Read more menu item.
Don't get in the way
Glass is designed to be there when you need it and out of the way when you don't. Your
Glassware must function in the same way. Offer engaging functionality that supplements
the user's life without taking away from it.
Keep It relevant
Deliver information at the right place and time for each of your users. The most
relevant experiences are also the most magical and lead to increased engagement and
Avoid the Unexpected
Unexpected functionality and bad experiences on Glass are much worse than on other
devices, because Glass is so close to your users' senses.
Don't send content too frequently and at unexpected times. Always make it clear to users
what the intention of your Glassware is and never pretend to be something you're not.
Build for people
Design interfaces that use imagery, colloquial voice interactions, and natural gestures.
Focus on a fire-and-forget usage model where users can start actions quickly and continue
with what they're doing.
The timeline controls most of the user experience
Immersions can momentarily take over for the timeline
The Glass user interface is a virtual timeline that is comprised of 640 × 360 pixel
Users scroll through the timeline to reveal cards in the past, present, and future.
The most recent items reside in the center of the timeline, closest to the user
Standard sections in the timeline define where cards reside based on the card's temporality.
Live cards appear within the timeline and contain content that is important at the
They constantly update to keep the information fresh and relevant.
Live Cards - Types
You can only create live cards with the GDK, because they
require access to lower-level functionality that the Mirror API
does not have. There are two types of live cards that you can
This type renders many times a second and can show rich 3D or
2D content. If you require fast rendering and a wide variety of
UI rendering options, this type of live card works best.
This type renders the card once every few seconds and can only
show a limited amount of UI components (mainly text and
images). A good use for this type of live card is to display status
or information updates that don't require real-time updates.
Static cards appear within the history section of the timeline.
Each card focuses on one thing, is visually clear, and is simple to read.
The simplest static card consists of one card that is displayed in the history section of the
timeline. A card can also take on characteristics that affect its behavior and structure.
Paginated cards spread content across many cards, because the content is too long. The
content would otherwise make sense on one card. Examples include a single news story or a
Tapping the card reveals a Read more action that reveals the rest of the content that users
can swipe through.
Bundles group together similar but distinct cards. Each card can stand on its own but bundles
allow logical groupings of cards based on similiarity or creation time.
Bundles have a page curl at the top right corner notifying users more information is available.
Tapping on a bundle reveals a sub-timeline of cards that users can swipe through.
This pattern describes inserting static cards in the timeline without an invocation
Notifications leverage Mirror services or background services on Glass to push
notifications to the timeline.
Ongoing tasks are long-running live cards that users leave and come back to frequently.
For example, the Stopwatch sample that is shipped with the GDK starts the stopwatch
with an ok glass command.
Users can view the stopwatch for some time, navigate through the timeline to check
other cards, and come back to the stopwatch. If the display sleeps, the stopwatch is the
default card that displays when the display wakes up (as long as it had focus when the
display went to sleep).Users can stop the stopwatch by tapping on a Stop menu item.
Another example of an ongoing task is Strava.
Strava inserts a live card that contains a timer for a current run or bike ride.
Tapping on the live card reveals menus to carry out a wide array of options.
A finish menu item removes the live card from the timeline when users are finished with
their run or bike ride.
Glass defines dimensions for a set of common regions to make it easy to design
and display different cards consistently.
You have limited space for text, so follow these guidelines when writing text for your
Keep it brief. Be concise, simple and precise. Look for alternatives to long text such as
reading the content aloud, showing images or video, or removing features.
Keep it simple. Pretend you're speaking to someone who's smart and competent, but
doesn't know technical jargon and may not speak English very well. Use short words,
active verbs, and common nouns.
Be friendly. Use contractions. Talk directly to the reader using second person ("you"). If
your text doesn't read the way you'd say it in casual conversation, it's probably not the
way you should write it.
Put the most important thing first. The first two words (around 11 characters, including
spaces) should include at least a taste of the most important information in the string. If
they don't, start over. Describe only what's necessary, and no more. Don't try to explain
subtle differences. They will be lost on most users.
Avoid repetition. If a significant term gets repeated within a screen or block of text, find
a way to use it just once.
Glass Development Kit
The Glass Development Kit (GDK) is an add-on to the Android SDK that lets you build
Glassware that runs directly on Glass.
Work in the Android environment
We designed the Glass platform to make the existing Android SDK just work on
Glass. This lets you code in a familiar environment, but for a uniquely novel device.
In addition, you can use all of the existing Android development tools, and your
Glassware is even delivered as a standard Android package (APK).
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Google Mirror API – Developer Guide
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