在android中获取每段时间的音频频率

int sampleRate = 44100; // 采样率
int bufferSize = AudioRecord.getMinBufferSize(sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);

short[] buffer = new short[bufferSize];

audioRecord.startRecording();
audioRecord.read(buffer, 0, bufferSize);

double[] magnitude = new double[bufferSize / 2];
double[] frequency = new double[bufferSize / 2];

FFT.fft(buffer, magnitude, frequency);

int startFrequencyIndex = 0; // 起始频率索引
int endFrequencyIndex = bufferSize / 2; // 结束频率索引

for (int i = startFrequencyIndex; i < endFrequencyIndex; i++) {
    double freq = frequency[i];
    double mag = magnitude[i];
    
    // 处理每段时间的音频频率
}