我对Java&安卓和我的代码有一些问题。
location1.distanceTo(location2)
方法是否也考虑高程变化来计算距离?
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) {}
}; }
我想提到的是,无论有没有网络提供商侦听器,准确性问题都会持续存在。
结论
代码是正确的,但GPS数据的准确性不是。我从卡斯滕回答下的评论中了解到了这一点。
定位对象通常也包含海拔信息,因此会考虑海拔。
更新之间位置是否发生变化?我会这么认为,因为在你的情况下,它每秒钟都会更新一次。