GeoCoder不显示contryName

Question

我想用我创建的LocationTracker类来获取我所在位置的国家名，但是我不能使用GeoCoder获得国家名

这是我的LocationTracker课

package com.farzin.locationmap.Location;


import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import com.farzin.locationmap.R;

import java.util.List;

public class LocationTracker extends Service implements LocationListener {

    Location location;
    LocationManager locationManager;
    Context context;

    boolean isGPSEnabled = false;
    boolean isNetworkEnabled = true;
    boolean canGetLocation;

    double longitude;
    double latitude;

    static final long MIN_DISTANCE = 10;
    static final long MIN_TIME = 1000 * 60;

    public LocationTracker(Context context) {
        this.context = context;
        getLocation();
    }


    public Location getLocation(){

        locationManager = (LocationManager)context.getSystemService(LOCATION_SERVICE);

        //gps check
        isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

        //network check
        isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!isNetworkEnabled && !isGPSEnabled){
            canGetLocation = false;
        }else {
            canGetLocation = true;



            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
                    MIN_TIME,MIN_DISTANCE,this);

            if (locationManager != null){

                location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                if (location != null){
                    longitude = location.getLongitude();
                    latitude = location.getLatitude();
                }
            }

            if (isGPSEnabled){

                if (location == null){
                    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                            MIN_TIME,MIN_DISTANCE,this);

                    if (locationManager != null){
                        location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

                        if (location != null){
                            longitude = location.getLongitude();
                            latitude  = location.getLatitude();
                        }
                    }
                }
            }
        }
        return location;
    }

    public double getLongitude() {
        return longitude;
    }

    public double getLatitude() {
        return latitude;
    }

    public boolean hasLocation(){
        return canGetLocation;
    }

    public void showAlertSettings(){

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);

        alertDialog.setTitle(R.string.warning);

        alertDialog.setMessage(R.string.gps_warning_massage);

        alertDialog.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                startActivity(intent);
            }
        });

        alertDialog.setNeutralButton(R.string.cancel, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();
            }
        });
    }

这里是我的主要活动，在这里我试图为Toast创建用于测试的国家名称

locationTracker = new LocationTracker(getApplicationContext());

        if (locationTracker.hasLocation()){

            lat = locationTracker.getLatitude();
            lon = locationTracker.getLongitude();

            Geocoder geocoder = new Geocoder(getApplicationContext(),new Locale("fa"));
            try {
                List<Address> addressList = geocoder.getFromLocation(lat, lon, 1);

                Address address = addressList.get(0);
                String countryName = address.getCountryName();
                Toast.makeText(this, countryName, Toast.LENGTH_SHORT).show();

             } catch (IOException e) {
                e.printStackTrace();
            }catch (Exception e){
                e.printStackTrace();
            }



        }else {
            locationTracker.showAlertSettings();
        }

我是新来的，所以这里的问题似乎是什么？

另外，忽略我没有要求用户许可的部分--这只是为了测试目的.

Answer 1

我脑子里有两件事。

第一例：

如果该设备位于谷歌拒绝来自它的请求的区域，地编码器就不会恢复任何数据。(比如克里米亚、古巴、所谓的顿涅茨克人民共和国、卢甘斯克人民共和国、伊朗、朝鲜和叙利亚)

您可能想尝试使用VPN来更改您的IP，并尝试查看您是否在响应中获得数据。

第二个案件：

您可能希望尝试不同的位置，并查看响应中是否存在数据检索。如果另一个位置确实撤回了数据，那么这很可能意味着Geo编码器实际上没有从先前提供的位置获取任何数据。

Answer 2

试试这个

    Geocoder geocoder;
    List<Address> addresses;
    geocoder = new Geocoder(requireActivity(), Locale.getDefault());

    try {
       addresses = geocoder.getFromLocation(lat, lng, 1);
       String country = addresses.get(0).getCountryName();

    }catch (IOException e)
    {
      e.printStackTrace();
    }