Question

我正在尝试学习如何获取Android设备的当前坐标，并且我有以下代码：

package com.example.pruebageolocalizacion;

import java.util.List;

import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.widget.Toast;

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        LocationManager locManager = (LocationManager)getSystemService(LOCATION_SERVICE);


        List<String> listaProviders = locManager.getAllProviders();

        for(int i=0;i<listaProviders.size();i++) {
            Toast.makeText(getApplicationContext(),listaProviders.get(i).toString(),Toast.LENGTH_LONG).show();
        }


        if (!locManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            Toast.makeText(getApplicationContext(), "GPS DESACTIVADO",Toast.LENGTH_LONG).show();
        }
        else {

            Location ultimaLocalizacion = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

            if(ultimaLocalizacion!=null) {
                    double ultimaLatitud = ultimaLocalizacion.getLatitude();
                    double ultimaLongitud = ultimaLocalizacion.getLongitude();          
                    Toast.makeText(getApplicationContext(), "Ultma latitud: " + ultimaLatitud ,Toast.LENGTH_LONG).show();
                    Toast.makeText(getApplicationContext(), "Ultma longitud: " + ultimaLongitud ,Toast.LENGTH_LONG).show();             
            }
            else {
                Toast.makeText(getApplicationContext(), "Ultma localizacion es null",Toast.LENGTH_LONG).show();

                LocationListener locListener = new LocationListener() {
                    public void onLocationChanged(Location location) {
                        Toast.makeText(getApplicationContext(), "Ultma latitud: " + String.valueOf(location.getLatitude()) ,Toast.LENGTH_LONG).show();
                        Toast.makeText(getApplicationContext(), "Ultma longitud: " + String.valueOf(location.getLongitude()) ,Toast.LENGTH_LONG).show();                
                        Toast.makeText(getApplicationContext(), "Precision: " + String.valueOf(location.getAccuracy()) ,Toast.LENGTH_LONG).show();              
                    }

                    public void onProviderDisabled(String provider){
                        Toast.makeText(getApplicationContext(), "GPS DESACTIVADO",Toast.LENGTH_LONG).show();

                    }

                    public void onProviderEnabled(String provider){
                        Toast.makeText(getApplicationContext(), "GPS ACTIVADO",Toast.LENGTH_LONG).show();
                    }

                    public void onStatusChanged(String provider, int status, Bundle extras){
                        Toast.makeText(getApplicationContext(), "Status del proveedor" + status,Toast.LENGTH_LONG).show();
                    }
                };      

                Toast.makeText(getApplicationContext(), "A",Toast.LENGTH_LONG).show();
                locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 0, locListener);
                Toast.makeText(getApplicationContext(), "B",Toast.LENGTH_LONG).show();
            }
        }   
    }
}

我在Android虚拟设备和手机中都尝试了这些，这些是我在屏幕上可以看到的消息：

“网络”，“被动”，“gps”，“Ultma localizacion es null”，“A”，“B”，

我在两台设备上都启用了WIFI和GPS。而且我多次使用手机的GPS。那么，ultimaLocalizacion不应该与null不同吗？

另外，如果ultimaLocalizacion为空，为什么它不会每三秒向我显示纬度，经度和准确度？

非常感谢。

在Android中获取经度和纬度

0 个答案: