问题
Which API can tell me the information about if LED is supported by a specific accessory device?
回答1:
Neither the SmartWatch nor the Smart Wireless Headset Pro contains a LED.
However, you can use the Capabilities API to get information about the device capabilities, as described in chapter 4 in the SDK.
The URI for the content provider of the LED is defined in the utility classes, as well as an URI for the content provider of the Capabilities view.
Registration$Capabilities
Registration$Led
Registration$LedColumns
来源：https://stackoverflow.com/questions/11007048/sony-smartwatch-how-to-know-if-led-is-supported-by-an-accessory-device