Android Question mic audio level from AudioRecorder


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Hi all, I try to monitor mic audio level with ar.AudioMaxAmplitude in AudioRecorder lib, it works, but seams with bug, there are always some false peaks come, like in the picture.

I try the other project soundmeter (detail in the following link), and use sm.dBValue, no false peaks, but I need it work background, and soundmeter couldn't run background.

my question:
1. any one met the same problem with AudioRecorder lib Version2.10 ? how to solve it?
2. could soundmeter run background, and monitor the mic audio level?