我目前正尝试在android studio上开发一个跑步跟踪器，我使用一种普通的技术来获得距离，然后把它转换成英里而不是米，我是在一个服务中完成的。但是，当我启动模拟路由时，它开始喷射出随机长数。我知道这与如何使用distanceto（）计算距离有关，但不知道如何解决它。没有公布完整的代码，但相关的部分是吹

@Override
    public void onCreate() {
        super.onCreate();
        Log.d("G53", "onCreate called");
        locationListener = new MyLocationListener();
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        try {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5, 5, locationListener);
            location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            oldLocation = location;

        } catch (SecurityException e) {
            Log.d("g53mdp", e.toString());
        }
    }

 public double getDistance() {

        if(running) {
            distance = distance * 0.000621371192;
            Log.d("tag", " " + distance);
            return distance;
        }
        return 0;

    }

    public void startExercise() {
        Log.d("tag", "startExercise called");
        startTime = System.currentTimeMillis();
        stopTime = 0;
        running = true;
        distance = 0;
    }

    public void stopExercise() {
        Log.d("tag", "stopExercise called");
        running = false;
        startTime = 0;
    }

    public class MyLocationListener extends Binder implements LocationListener, IInterface {

        @Override
        public void onLocationChanged(Location location) {

            if(running) {
                distanceInMetres = oldLocation.distanceTo(location);
                if (distanceInMetres < 10) {
                    Log.i("DISTANCE", "Values too close, so not used.");
                } else {
                    distance += distanceInMetres;
                    oldLocation = location;
                }
            }
        }

logcat中的输出如下所示