如何在android java中更改麦克风灵敏度

<uses-permission android:name="android.permission.RECORD_AUDIO" />

int sampleRateInHz = 44100; // 采样率，可以根据需要进行调整
int channelConfig = AudioFormat.CHANNEL_IN_MONO; // 单声道
int audioFormat = AudioFormat.ENCODING_PCM_16BIT; // 16位PCM编码
int bufferSizeInBytes = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);

AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes);

AudioDeviceInfo[] audioDevices = AudioManager.getAudioManager().getDevices(AudioManager.GET_DEVICES_INPUTS);
AudioDeviceInfo preferredDevice = null;

for (AudioDeviceInfo device : audioDevices) {
    if (device.getType() == AudioDeviceInfo.TYPE_BUILTIN_MIC) {
        preferredDevice = device;
        break;
    }
}

if (preferredDevice != null) {
    audioRecord.setPreferredDevice(preferredDevice);
    audioRecord.setMicrophoneDirection(AudioRecord.MIC_DIRECTION_UNSPECIFIED);
    audioRecord.setMicrophoneFieldDimension(0.0f);
}

audioRecord.startRecording();

byte[] buffer = new byte[bufferSizeInBytes];
audioRecord.read(buffer, 0, bufferSizeInBytes);

// 处理音频数据

audioRecord.stop();
audioRecord.release();