Android Bluetooth Part 2: Beacon in Wearable Devices
Wearable technology is rapidly evolving, with new applications emerging daily—from smartwatches and fitness trackers to even smart wigs! At the core of this transformation is Bluetooth Smart, enabling seamless connectivity between devices. This is the second in a series of articles about the Android Wear operating system, designed to help developers create the best "wrist experience" for users—whether they're wearing it on their wrist, ear, head, or neck.
In our first post, Xiaomao covered the basics of building an Android Wear experience and extending Android notifications. Now, in this second part, we’ll dive into how to develop an app that runs independently on wearable devices.
Why build a full Android Wear app when you can use notifications? Well, developing a dedicated app gives you more control over the user interface, allowing custom layouts and richer interactions. It also enables two-way communication between the wearable and the smartphone, making it possible for both devices to exchange information seamlessly.
While Android Wear apps can run independently, it's important to remember the differences in capabilities between smartphones and wearables. Complex tasks, like continuous Beacon scanning, are better handled by the smartphone due to its greater processing power. For example, once the phone detects a Beacon, it can send relevant exhibit information to the smartwatch, letting users view details directly on their wrist.
Android Wear provides several key APIs to facilitate this interaction. The **DataApi** allows synchronization across all connected devices, ensuring that data like exhibit details is shared efficiently. Using `PutDataRequest`, developers can define specific paths for data transfer, and the `onDataChanged` method handles incoming updates.
The **MessageApi** lets apps send byte arrays between devices, often used as a remote procedure call (RPC) mechanism. Combined with the **CapabilityApi**, which helps identify nodes that can process certain types of data, this creates a powerful framework for communication.
Finally, the **NodeApi** gives access to the network of connected devices, helping manage interactions within the wearable ecosystem.
For the Museum Guide app, Xiaobian designed a multi-page UI using `GridViewPager`. When a user approaches an exhibit, three pages appear: the title page, a feedback page with a “Like†button, and an information page. If no Beacon is detected, only the title page is shown. But once the smartphone identifies a Beacon, it sends images and details to the watch, unlocking the full experience.
To send exhibit data, Xiaobian used the Data API, packaging images into an `Asset` object and sending them via `PutDataMapRequest`. The timestamp included ensures that only updated data is sent, avoiding unnecessary transfers.
On the wearable side, the `DataListener` interface listens for changes, updating the UI accordingly. Similarly, pressing the “Like†button triggers a message sent through the Message API, notifying the smartphone. The `MessageListener` on the phone then processes this input, storing user feedback.
Bluetooth Smart and the Android Wear APIs make it possible to create engaging, interactive experiences that enhance the way users engage with their environment. Whether it’s navigating a museum or tracking fitness goals, wearable tech continues to redefine what’s possible.
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