Is there a library for acoustic signal analysis in android? Or any sample? I want to process breaking branches of trees sounds orr something like this.
You can adapt the attached java class and perform your signal processing (do you need the FFT? FFTW, http://www.fftw.org/download.html, has some Java wrappers). If you want to implement the code by your own, I found the paper "SoundSense: scalable sound sensing for people-centric applications on mobile phones" (http://cvrr.ucsd.edu/ece285/papers/Lu_soundsense.pdf) really interesting with signal processing techniques that you can easily implement.