Users appreciate the convenience of wireless headsets, such as Bluetooth A2DP devices.

用户很喜欢无线耳机的便捷，比如蓝牙A2DP系列。

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API support for Bluetooth A2DP and HSP profiles lets applications query Bluetooth profiles for connected devices, audio state, and more, then notify the user.

API对蓝牙A2DP和HSP配置的支持使得应用可以查询连接的蓝牙设备所提供的蓝牙协定、音频栈等，并通知用户。

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Note that when the currently active audio output device does not support volume control (such as an A2DP device), the volume slider is replaced by the appropriate device name.

注意如果当前的声音输出设备不支持音量控制(就像设备A2DP)，音量滑块就不会显示，取而代之的是设备名称。

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Note that when the currently active audio output device does not support volume control (such as an A2DP device), the volume slider is replaced by the appropriate device name.

注意如果当前的声音输出设备不支持音量控制(就像设备A2DP)，音量滑块就不会显示，取而代之的是设备名称。

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