如何在xamarin forms for android中使用STEP_COUNT_SENSOR计算步数

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

using Android.Hardware;

public class StepCounterService : Java.Lang.Object, ISensorEventListener
{
    private SensorManager sensorManager;
    private Sensor stepSensor;

    public StepCounterService()
    {
        sensorManager = (SensorManager)Android.App.Application.Context.GetSystemService(Context.SensorService);
        stepSensor = sensorManager.GetDefaultSensor(SensorType.StepCounter);
    }

    public void StartCountingSteps()
    {
        sensorManager.RegisterListener(this, stepSensor, SensorDelay.Normal);
    }

    public void StopCountingSteps()
    {
        sensorManager.UnregisterListener(this);
    }

    public void OnAccuracyChanged(Sensor sensor, SensorStatus accuracy)
    {
        // 不需要实现
    }

    public void OnSensorChanged(SensorEvent e)
    {
        if (e.Sensor.Type == SensorType.StepCounter)
        {
            int stepCount = (int)e.Values[0];
            // 在这里处理步数变化的逻辑
        }
    }
}

private StepCounterService stepCounterService;

private void StartCountingButton_Clicked(object sender, EventArgs e)
{
    stepCounterService = new StepCounterService();
    stepCounterService.StartCountingSteps();
}

private void StopCountingButton_Clicked(object sender, EventArgs e)
{
    stepCounterService.StopCountingSteps();
}