我有媒体记录，我需要检查麦克风是否可以使用。现在，我可以运行默认录音机并启动我的应用程序。结果，我的应用程序无法访问麦克风，我无法捕捉到这种情况。
当麦克风准备好使用时，您是否知道一些捕捉情况的技巧？
11-01 09:36:34.690: ERROR/NvAudioALSAControl(8901): Control 'DRC Switch' cannot get
element info: -2
11-01 09:36:34.690: ERROR/NvAudioALSAControl(8901): Control 'Left Input PGA Volume' cannot get element info: -2
11-01 09:36:34.690: ERROR/NvAudioALSAControl(8901): Control 'Right Input PGA Volume' cannot get element info: -2
11-01 09:36:34.690: ERROR/NvAudioALSAControl(8901): Control 'Digital Capture Volume' cannot get element info: -2
11-01 09:36:34.690: ERROR/NvAudioALSAControl(8901): Control 'HPF Mode' cannot get element info: -2
11-01 09:36:34.790: ERROR/NvAudioALSAControl(8901): Control 'DRC Switch' cannot get element info: -2
11-01 09:36:34.790: ERROR/NvAudioALSAControl(8901): Control 'Left Input PGA Volume' cannot get element info: -2
11-01 09:36:34.790: ERROR/NvAudioALSAControl(8901): Control 'Right Input PGA Volume' cannot get element info: -2
11-01 09:36:34.790: ERROR/NvAudioALSAControl(8901): Control 'Digital Capture Volume' cannot get element info: -2
11-01 09:36:34.790: ERROR/NvAudioALSAControl(8901): Control 'HPF Mode' cannot get element info: -2