我正试图通过以下代码实现a基音检测应用程序：https://medium.com/@juniorbump/pitch-检测-in-android-using-tarsosdsp-a2dd4a3f04e9
但是，应用程序在运行时崩溃，我的logcat错误如下：

java.lang.IllegalStateException: startRecording() called on an uninitialized AudioRecord.

这是我的密码：

import android.os.Bundle;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import be.tarsos.dsp.AudioDispatcher;
import be.tarsos.dsp.AudioEvent;
import be.tarsos.dsp.AudioProcessor;
import be.tarsos.dsp.io.android.AudioDispatcherFactory;
import be.tarsos.dsp.pitch.PitchDetectionHandler;
import be.tarsos.dsp.pitch.PitchDetectionResult;
import be.tarsos.dsp.pitch.PitchProcessor;

public class MainActivity extends AppCompatActivity {

    TextView noteText;
    TextView pitchText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        noteText = findViewById(R.id.noteText);
        pitchText = findViewById(R.id.pitchText);

        AudioDispatcher dispatcher =
                AudioDispatcherFactory.fromDefaultMicrophone(22050,1024,0);

        PitchDetectionHandler pdh = new PitchDetectionHandler() {
            @Override
            public void handlePitch(PitchDetectionResult res, AudioEvent e){
                final float pitchInHz = res.getPitch();
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        processPitch(pitchInHz);
                    }
                });
            }
        };
        AudioProcessor pitchProcessor = new PitchProcessor(PitchProcessor.PitchEstimationAlgorithm.FFT_YIN, 22050, 1024, pdh);
        dispatcher.addAudioProcessor(pitchProcessor);

        Thread audioThread = new Thread(dispatcher, "Audio Thread");
        audioThread.start();
    }

    public void processPitch(float pitchInHz) {

        pitchText.setText("" + pitchInHz);

        if(pitchInHz >= 110 && pitchInHz < 123.47) {
            //A
            noteText.setText("A");
        }
        else if(pitchInHz >= 123.47 && pitchInHz < 130.81) {
            //B
            noteText.setText("B");
        }
        else if(pitchInHz >= 130.81 && pitchInHz < 146.83) {
            //C
            noteText.setText("C");
        }
        else if(pitchInHz >= 146.83 && pitchInHz < 164.81) {
            //D
            noteText.setText("D");
        }
        else if(pitchInHz >= 164.81 && pitchInHz <= 174.61) {
            //E
            noteText.setText("E");
        }
        else if(pitchInHz >= 174.61 && pitchInHz < 185) {
            //F
            noteText.setText("F");
        }
        else if(pitchInHz >= 185 && pitchInHz < 196) {
            //G
            noteText.setText("G");
        }
    }
}

我已经使用：uses permission在清单中授予了权限android:name=“android.permission.record\u音频”/
关于如何解决这个问题有什么建议吗？