If you're one of the many, many Android users who own some sort of wireless Bluetooth accessory, there's a high chance you've at some point wished for an easy way to check its battery status right from your device's screen. And as it happens, the Bluetooth standard already has support for the feature — in fact, it has had it for more than five years. And while many manufacturers have their own implementations of the feature, it's still not present in the AOSP (a.k.a. the base all Android variants derive from).
But as uncovered in Android's source ...
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