我想在我的应用程序中得到经度和纬度的值,我已经做到了,但问题是我用值得到了负号。虽然值是正确的,但不知道为什么用值得到负号。

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) {

}

}