This is an audio recorder with waveform and spectrum viewer.
This is an audio recorder.
The sampling rate can be set to 48,000 Hz.
You can record very high quality sound with that high sampling rate.
Recorded files are saved in lossless wave format.
You can play recorded files with personal computers.
This application shows the waveform and frequency spectrum in real-time by using FFT.
There is no limit to length of recorded files.
There is a free version with advertisement.
RECORD_AUDIO: to use MIC.
WRITE_EXTERNAL_STORAGE: to save files to SD card.
Download apk file for your android phone: https://goo.gl/C7tIYX