问步骤检测传感器未触发OnSensorChanged()

EN

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.List;

public class MainActivity extends AppCompatActivity implements SensorEventListener{

    Button btnReset;
    private SensorManager sensorManager;
    private Sensor stepSensor;
    private boolean isStepSensorAvailable;
    private TextView txtSteps, txtCheck;
    private int stepCounter;
    private List<Sensor> deviceSensors;  //bugfixing

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

        if(sensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR) != null)
        {
            stepSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);
            txtCheck.setText("Sensor was found, stepsensor is now " + stepSensor.getName());
            isStepSensorAvailable = true;
        }
        else
        {
            txtSteps.setText(getString(R.string.txt_step_sensor_not_available));
            isStepSensorAvailable = false;
        }


    }

    private void initialize() {
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        txtSteps = findViewById(R.id.txtSteps);
        txtCheck = findViewById(R.id.txtCheck);
        stepCounter = 0;
        btnReset = findViewById(R.id.btnReset);
        btnReset.setVisibility(View.INVISIBLE);
        txtSteps.setVisibility(View.INVISIBLE);

    }

    /**
     * Checking for available Sensors
     */

    @Override
    protected void onResume()
    {
        super.onResume();
        if(sensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR) != null)
        {
            sensorManager.registerListener(this, stepSensor, sensorManager.SENSOR_DELAY_FASTEST);
            txtCheck.setText(txtCheck.getText() + System.getProperty("line.separator") + "listener registered!");
        }
    }

    @Override
    protected void onPause()
    {
        super.onPause();
        if(sensorManager.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR) != null)
        {
            sensorManager.unregisterListener(this, stepSensor);
        }
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor == stepSensor)
        {
            txtCheck.setText(txtCheck.getText() + System.getProperty("line.separator") + "Sensorevent was triggered!");
            stepCounter = (int) (stepCounter + event.values[0]);
            txtSteps.setText(String.valueOf(stepCounter));
        }


    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }
}