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Android Wearable Programming by Steven F. Daniel

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Understanding the Android Wear architecture

Android Wear works by communicating wirelessly over Bluetooth between the wearable and a handheld device (typically a smartphone) running Android 4.3 or higher. When the handheld device has been paired with the wearable device, the operating system begins sending a series of notification messages automatically to the watch, along with any wearable-specific rich notification parameters, such as voice input for actions and any specific pieces that provide additional information.

When a connection has been established between the Android device and the wearable, over Google Play service, notification messages can be then exchanged between the handheld device and the wearable to trigger appropriate actions ...

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