Earlier XDA Developers discovered that Google was working on implementing Bluetooth battery level reporting so you can see the battery level of your connected Bluetooth devices without having to use a third-party application for each and every Bluetooth device.
But now it appears that the Bluetooth battery level indicators they initially speculated about are finally coming to Google devices. Pixel 2 and Pixel 2 XL flagships are able to show battery levels of Bluetooth devices, as suggested by the teardowns of the SystemUI and framework-res APKs performed by XDA Developers. String Below…
<string name="bluetooth_connected_battery_level">Connected, battery %1$s</string> <string name="bluetooth_connected_no_a2dp_battery_level">Connected (no media), battery %1$s</string> <string name="bluetooth_connected_no_headset_battery_level">Connected (no phone), battery %1$s</string> <string name="bluetooth_connected_no_headset_no_a2dp_battery_level">Connected (no phone or media), battery %1$s</string>
The above code show that the SystemUI (the package responsible for the navigation bar, status bar, quick settings panel, and more) has strings for showing the current battery level of a connected Bluetooth device.
We should also note that these exact same strings are found in the Settings package, which means that the Bluetooth battery level will probably be shown in the Bluetooth settings screen.
The relevant code found in the files indicates that the functionality is either live or essentially ready to go live through a server-side switch and will allow the upcoming Android-powered smartphones to feature battery level indicators for accessories paired with them via Bluetooth.
This means that your Google Pixel 2 and Pixel 2 XL will let apps know when the battery level changes on connected Bluetooth devices. Apps can then respond to these changes in whatever manner they want, such as with an updated notification.
The indicators themselves are likely to be placed in the notification tray and always be visible by default, as is the case with similar implementations of the feature on handsets from Samsung, LG, and a number of other original equipment manufacturers.
The image that can be seen above is a cropped version of one of Google’s Pixel 2 XL promotional renders and shows how the device will display the battery level of the Pixel Buds once it detects the earbuds and offers to connect with them, though it’s possible that the smartphone will handle third-party accessories in a different manner.
The analyzed files were made for Android 8.0 Oreo and the original Pixel and Pixel XL should also be able to take advantage of them once they’re distributed officially. The Pixel 2 series will presumably support the functionality out of the box, though Google has yet to officially confirm that.
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