使用android.location.Location.distanceTo（startLocation）获取有时增加的距离，有时会减少？(use android.location.Location.distanceTo(startLocation) to get the distance that sometimes increase and sometimes reduce?)

 在我的Android运行应用程序中，我使用android.location.Location.distanceTo（startLocation）来获取我开始运行的startLocation和我停止运行的endLocation之间的距离。 但是距离有时会增加，有时它会在我跑步时减少。 有谁帮我解决了这个问题？ 
 
 我的代码是这样的： 
 
LocationManager locationManager = (LocationManager) getSystemService(
                    Context.LOCATION_SERVICE);
String provider = LocationManager.GPS_PROVIDER;
Location startLocation = locationManager
                        .getLastKnownLocation(provider);
LocationListener locationListener = new LocationListener() {
    @Override
    public void onLocationChanged(Location location) {
        double distance = location.distanceTo(startLocation)/1000;
    } 

    @Override
    public void onStatusChanged(String provider, int status,
            Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
};
locationManager.requestLocationUpdates(provider, 2000, 3,
                        locationListener);

In my android Running App, I use android.location.Location.distanceTo(startLocation) to get the distance between startLocation where i start running and endLocation where i stop running. But the distance sometimes increase, sometimes it reduce when i run. anyone help me to solve the question?
 
my code like this :
 
LocationManager locationManager = (LocationManager) getSystemService(
                    Context.LOCATION_SERVICE);
String provider = LocationManager.GPS_PROVIDER;
Location startLocation = locationManager
                        .getLastKnownLocation(provider);
LocationListener locationListener = new LocationListener() {
    @Override
    public void onLocationChanged(Location location) {
        double distance = location.distanceTo(startLocation)/1000;
    } 

    @Override
    public void onStatusChanged(String provider, int status,
            Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
};
locationManager.requestLocationUpdates(provider, 2000, 3,
                        locationListener);

原文：https://stackoverflow.com/questions/37644466