The document discusses building apps for Android Wear. It outlines that Android Wear allows developers to create useful and imaginative apps for watches using familiar Android APIs. Developers have flexibility to customize the user experience, including creating custom watch faces. There are three main types of experiences that can be built: apps, custom watch faces, and notifications. The document then provides more details on each type of experience that can be created for Android Wear.

1. Building for Android Wear
Depth and Flexibility.
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2. With so many recent updates and improvements to Android
Wear, it's high time to share an updated overview of the
platform.
Google certainly not done—there's a lot more to come—but this
is the picture today as you start or continue developing your
groundbreaking Android Wear user experiences.
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The Road Ahead

3. The Android Wear platform emphasizes depth and flexibility. Built on Android,
it allows developers to use familiar APIs to create useful, performant, and
imaginative apps that run directly on the watch.
In the spirit of Android, you have the freedom to make substantial changes to
the user experience, including the creation of custom watch faces.
There are three main categories of experiences you can build:
apps, custom watch faces, and notifications.
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Android Wear App types

4. Apps
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Apps that are built for Android Wear run directly on the watch and
can do nearly anything a phone can, from tracking your run to
giving you a little entertainment while waiting for the bus.
Some even work without a connection to the phone, such as fitness
and music apps. There are libraries to help you move data between
the phone and the wearable, as well as create stunning and
adaptable UIs.

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Here's a list of some of the great features you have access to:
Feature Documentation
Full screen activities with touch events Creating Custom UIs for Wear Devices
Notifications and custom actions UI Patterns for Android Wear
Custom Watch faces Creating Watch Faces
Layouts for round and square devices Creating Custom UIs for Wear Devices
OpenGL Displaying Graphics with OpenGL ES
Sensors
lAccelerometer
lGyroscope
lCompass
lBarometer
lHeart rate sensor
SensorManager

6. Feature Documentation
Haptics Vibrator
Microphone AudioRecord
Voice actions Adding Voice Capabilities
GPS Detecting Location on Android Wear
Offline storing of data / music Transferring Assets
Media playback controls MediaSession, MediaController
Framework based on Android 5.0 API
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Android 5.0 APIs
Standalone or synchronized apps Sending and Syncing Data
Here's a list of some of the great features you have access to:

7. Watch Faces
The ability to create custom watch faces gives you direct access
to the most prominent UI element on a user's most personal
device. The API is simple enough to build watch faces quickly and
flexible enough to allow personalization.
Again, given the depth and flexibility of the Android platform,
you can create something for the user that's both beautiful and
packed with unique features.
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8. The development journey starts with the simplicity of bringing
your design to the wrist. At the core of the watch face API is the
onDraw method that allows you to draw whatever design you
can think of to the canvas at a high enough frame rate to deliver
fluid animation.
This will come through at full fidelity while the watch is in
interactive mode.
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Designing for Android Wear

9. At other times, when the watch is in ambient mode, you're able to
draw a more discreet version of the watch face. Additional preferences
can be set to arrange the system UI elements appropriately for your
design. Once those basics are covered, the limits are your imagination!
You can go further with additions like the moon phase, current
weather, or fitness stats. Watchmakers call these items
"complications" -- but with Android they're hardly complicated. Once
you have the data, just draw it on the canvas as you did the time.
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Ambient Mode, Moon Phase & More

10. Of course, Android Wear Notifications are the easiest way to get
started in the world of wearables.
If you've got an Android app with notifications -- they already work on
a Wear watch.
If you've already enhanced your notification with actions, this is even
better and also automatically already works.
You can take things further with Wear-specific functionality like Stacks,
Pages, and Voice Replies that make your notifications richer
experiences on the wrist.
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Notifications

11. The user experiences you build for Wear get to take advantage of the
power and flexibility of the Android platform.
It's easy to get started and possible to create truly groundbreaking UI
for your users.
Together, we can create an ecosystem of user experiences as diverse as
the watches they run on and the people who wear them
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