android - 获取纬度和经度的负值

Question

我想在我的应用程序中获取经度和纬度的值，我已经做到了，但问题是我正在获取带值的负号。虽然值是正确的，但不知道为什么要带值的负号。

java类代码:

package com.vshine.neuron.testing;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class code extends AppCompatActivity implements LocationListener {
    private TextView textView;
    private LocationManager locationManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_code);
        textView = findViewById(R.id.tv);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

         if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
         // TODO: Consider calling
         //    ActivityCompat#requestPermissions
         // here to request the missing permissions, and then overriding
         //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
         //                                          int[] grantResults)
         // to handle the case where the user grants the permission. See the documentation
         // for ActivityCompat#requestPermissions for more details.
         return;
         }
         Location location = locationManager.getLastKnownLocation(locationManager.NETWORK_PROVIDER);
         onLocationChanged(location);
         }

@Override
public void onLocationChanged(Location location) {
        double longitude = location.getLongitude();
        double latitude = location.getLatitude();
        textView.setText("Longitude: " + longitude + "\n\n" + "Latitude: " + latitude);

        }

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

        }

@Override
public void onProviderEnabled(String provider) {

        }

@Override
public void onProviderDisabled(String provider) {

        }
        }

Answer 1

Latitude and Longitude can have negative values.

你的代码没问题

Check any ref