getLastKnownLocation возвращает 0,0 в Android

Question

Я пытаюсь просто вернуть lat/lon моей текущей позиции с помощью GPS. Независимо от того, что я делаю, возврат 0,0 для сети и GPS. Я пробовал ходить по окну.

Вот мой GPS код:

import android.app.Service; 

// 
import android.Manifest; 
import android.app.AlertDialog; 
import android.app.Service; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 

import android.content.pm.PackageManager; 
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 android.support.v4.app.ActivityCompat; 
import android.util.Log; 
import android.widget.Toast; 


public class TrackGPS extends Service implements LocationListener { 

    private final Context mContext; 


    boolean checkGPS = false; 


    boolean checkNetwork = false; 

    boolean canGetLocation = false; 

    Location loc; 
    double latitude; 
    double longitude; 


    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; 


    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; 
    protected LocationManager locationManager; 

    public TrackGPS(Context mContext) { 
     this.mContext = mContext; 
     getLocation(); 
    } 

    private Location getLocation() { 

     try { 
      locationManager = (LocationManager) mContext 
        .getSystemService(LOCATION_SERVICE); 

      // getting GPS status 
      checkGPS = locationManager 
        .isProviderEnabled(LocationManager.GPS_PROVIDER); 

      // getting network status 
      checkNetwork = locationManager 
        .isProviderEnabled(LocationManager.NETWORK_PROVIDER); 

      if (!checkGPS && !checkNetwork) { 
       Toast.makeText(mContext, "No Service Provider Available", Toast.LENGTH_SHORT).show(); 
      } else { 
       this.canGetLocation = true; 
       // First get location from Network Provider 
       if (checkNetwork) { 
        Toast.makeText(mContext, "Network", Toast.LENGTH_SHORT).show(); 

        try { 
         locationManager.requestLocationUpdates(
           LocationManager.NETWORK_PROVIDER, 
           0, 
           0, this); 
         Log.d("Network", "Network"); 
         if (locationManager != null) { 
          loc = locationManager 
            .getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 

         } 

         if (loc != null) { 
          latitude = loc.getLatitude(); 
          longitude = loc.getLongitude(); 
         } 
        } catch (SecurityException e) { 

        } 
       } 
      } 
      // if GPS Enabled get lat/long using GPS Services 
      if (checkGPS) { 
       Toast.makeText(mContext, "GPS", Toast.LENGTH_SHORT).show(); 
       if (loc == null) { 
        try { 
         locationManager.requestLocationUpdates(
           LocationManager.GPS_PROVIDER, 
           MIN_TIME_BW_UPDATES, 
           MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
         Log.d("GPS Enabled", "GPS Enabled"); 
         if (locationManager != null) { 
          loc = locationManager 
            .getLastKnownLocation(LocationManager.GPS_PROVIDER); 
          if (loc != null) { 
           latitude = loc.getLatitude(); 
           longitude = loc.getLongitude(); 
          } 
         } 
        } catch (SecurityException e) { 

        } 
       } 
      } 

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

     return loc; 
    } 

    public double getLongitude() { 
     if (loc != null) { 
      longitude = loc.getLongitude(); 
     } 
     return longitude; 
    } 

    public double getLatitude() { 
     if (loc != null) { 
      latitude = loc.getLatitude(); 
     } 
     return latitude; 
    } 

    public boolean canGetLocation() { 
     return this.canGetLocation; 
    } 

    public void showSettingsAlert() { 
     AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext); 


     alertDialog.setTitle("GPS Not Enabled"); 

     alertDialog.setMessage("Do you wants to turn On GPS"); 


     alertDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
       Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
       mContext.startActivity(intent); 
      } 
     }); 


     alertDialog.setNegativeButton("No", new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
       dialog.cancel(); 
      } 
     }); 


     alertDialog.show(); 
    } 


    public void stopUsingGPS() { 
     if (locationManager != null) { 

      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; 
      } 
      locationManager.removeUpdates(TrackGPS.this); 
     } 
    } 

    @Override 
    public IBinder onBind(Intent intent) { 
     return null; 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
     // this.location = location; 
     getLatitude(); 
     getLongitude(); 
    } 

    @Override 
    public void onStatusChanged(String s, int i, Bundle bundle) { 

    } 

    @Override 
    public void onProviderEnabled(String s) { 

    } 

    @Override 
    public void onProviderDisabled(String s) { 

    } 
} 

Вот мой Основная деятельность:

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Toast; 

public class MainActivity extends AppCompatActivity { 

    private Button b_get; 
    private TrackGPS gps; 
    double longitude; 
    double latitude; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     b_get = (Button)findViewById(R.id.get); 



     b_get.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 

       gps = new TrackGPS(MainActivity.this); 


       if(gps.canGetLocation()){ 


        longitude = gps.getLongitude(); 
        latitude = gps .getLatitude(); 

        Toast.makeText(getApplicationContext(),"Longitude:"+Double.toString(longitude)+"\nLatitude:"+Double.toString(latitude),Toast.LENGTH_SHORT).show(); 
       } 
       else 
       { 

        gps.showSettingsAlert(); 
       } 

      } 
     }); 
    } 

    @Override 
    protected void onDestroy() { 
     super.onDestroy(); 
     gps.stopUsingGPS(); 
    } 
} 

Вот мой Android Manifest:

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.quantums3.getcurrentlocation"> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application> 

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
    <uses-permission android:name="android.permission.INTERNET" /> 

</manifest> 

Спасибо заранее.

Answer 1

getLastKnownLocation возвращение 0,0 в Android

Не на самом деле, вышеуказанный способ возвращается нуль в вашем случае и из-за вашей TrackGPS структуры, вы видите значения double latitude;double longitude;