Question

我对Java＆amp; Android和我在代码方面存在一些问题。

location1.distanceTo(location2)方法是否也计算考虑高程变化的距离？

另一个问题是，虽然我没有移动设备，但测量的距离会发生变化。这是我的代码：

public class GpsCalculator{
public Activity activity;
private LocationManager locationManager = null;
private Location previousLocation = null;
private double totalDistance = 0D;
private Context context;
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1; // 1 meter
private static final long MIN_TIME_BW_UPDATES = 1000; // 1 second
TextView distance_tracker;

public GpsCalculator(TextView dt) {
    distance_tracker = dt;
}


public void run(Context act){
    context = act;
    // Get the location manager
    locationManager = (LocationManager) context.getSystemService(Service.LOCATION_SERVICE);

    // Add new listeners with the given params
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, locationListener); // Network location
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, locationListener); // Gps location
}

public void stop(){
    locationManager.removeUpdates(locationListener);
}
DecimalFormat df = new DecimalFormat("#");
private LocationListener locationListener = new LocationListener(){
    @Override
    public void onLocationChanged(Location newLocation){
        if (previousLocation != null){
            GpsCalculator.this.totalDistance +=  previousLocation.distanceTo(newLocation);
        }

        // Update stored location
        GpsCalculator.this.previousLocation = newLocation;

        CharSequence text = Double.toString(totalDistance);
        int duration = Toast.LENGTH_SHORT;

        Toast toast = Toast.makeText(context, text, duration);
        toast.show();

        distance_tracker.setText(df.format(totalDistance)+ " m");
    }

    @Override
    public void onProviderDisabled(String provider) {}

    @Override
    public void onProviderEnabled(String provider) {}

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

我想提一下，无论是否有网络提供商监听，准确性问题都会持续存在。

结论

代码是正确的，但GPS数据的准确性并非如此。我从Carsten的答案中的评论中理解了这一点。

Answer 1

位置对象通常还包含高度信息，因此会考虑高程。

更新之间的位置是否有变化？我想是这样的，因为它会在你的情况下每秒更新一次。

Android GPS精确距离测量

1 个答案: