它们可以在被按下的硬式按键上提供典型的操作行为，比如说Android的搜索按钮和音量控制。
They can typically act on hard keys being pressed, like Android's search button and volume controls.
但是最终输出的音量始终应该是由系统音量控制的，无论是使用音量按钮还是音量滑块。
But the volume of the final audio output should always be governed by the system volume, whether it's adjusted by the volume buttons or a volume slider.
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