I've been working with android audio recording for a while.
As far as I know the only guaranteed supported recording sample rate is
44100Hz which means up to 22KHz of bandwidth.
This should be a "real" sampling rate, no upsampling on most devices.
Did you try to set AudioRecord with 44.100Hz as
There is an audio recording problem with some devices, even newer ones.
The native audio recording sample rate appears to be a puny 8000 Hz, which
means it can only render frequencies up to 4000 Hz. This is a problem for
my piano tuning app which must detect frequencies above 4000 Hz. to tune
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