使用安卓AudioRecord获取32位样本？

int sampleRate = 44100; // 采样率
int channelConfig = AudioFormat.CHANNEL_IN_MONO; // 单声道
int audioFormat = AudioFormat.ENCODING_PCM_FLOAT; // 32位样本
int bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);
AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, channelConfig, audioFormat, bufferSize);

audioRecord.startRecording();

float[] audioData = new float[bufferSize / 4]; // 32位样本，每个样本占4个字节
audioRecord.read(audioData, 0, audioData.length, AudioRecord.READ_BLOCKING);