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Before, I asked question about Get frequency wav audio using FFT and Complex class , There, I need to calculate FFT value from AudioRecord input --> from microphone , I somehow managed to get the FFT value... Now I need to calculate FFT value from *.wav audio file that I saved before, I saved the audio in 'raw' folder inside 'res' folder from my project I still using the same FFT Class: http://www.cs.princeton.edu/introcs/97data/FFT.java The complex class to go with it: http://introcs.cs.princeton.edu/java/97data/Complex.java.html I use this method to read audio file from my raw foldern, then I call method calculateFFT to go with it private static final int RECORDER_BPP = 16; private static final int RECORDER_SAMPLERATE = 44100; private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO; private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT; private void asli(){ int counter = 0; int data; InputStream inputStream = getResources().openRawResource(R.raw.b1); DataInputStream dataInputStream = new DataInputStream(inputStream); List<Integer> content = new ArrayList<Integer>(); try { while ((data = dataInputStream.read()) != -1) { content.add(data); counter++; } } catch (IOException e) { e.printStackTrace();} int[] b = new int[content.size()]; int cont = 0; byte[] audio = convertArray(b); } Method to convert to byte public

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