获取用户位置的经度和纬度

Question

我坚持在这个代码在一周前我尝试了每个解决方案在堆栈溢出，并没有在我的问题工作问题是当我试图获取用户经度和纬度它给了我这里是零我的代码

public class AppLocationService extends Service implements LocationListener { 

    private Context mContext = null; 

    // flag for GPS status 
    boolean isGPSEnabled = false; 

    // flag for network status 
    boolean isNetworkEnabled = false; 

    // flag for GPS status 
    boolean canGetLocation = false; 

    Location location; // location 
    double latitude; // latitude 
    double longitude; // longitude 

    // The minimum distance to change Updates in meters 
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1; // 10 meters 

    // The minimum time between updates in milliseconds 
    private static final long MIN_TIME_BW_UPDATES = 60000; // 1 minute 

    // Declaring a Location Manager 
    protected LocationManager locationManager; 


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

    public AppLocationService() { 
     //super(context); 
    } 

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

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

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

      if (!isGPSEnabled && !isNetworkEnabled) { 
       // no network provider is enabled 
      } else { 
       this.canGetLocation = true; 
       // First get location from Network Provider 
       if (isNetworkEnabled) { 
        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; 
        } 
        locationManager.requestLocationUpdates(
          LocationManager.NETWORK_PROVIDER, 
          MIN_TIME_BW_UPDATES, 
          MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
        Log.d("Network", "Network"); 
        if (locationManager != null) { 
         location = locationManager 
           .getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 
         if (location != null) { 
          latitude = location.getLatitude(); 
          longitude = location.getLongitude(); 
         } 
        } 
       } 
       // if GPS Enabled get lat/long using GPS Services 
       if (isGPSEnabled) { 
        if (location == null) { 
         locationManager.requestLocationUpdates(
           LocationManager.GPS_PROVIDER, 
           MIN_TIME_BW_UPDATES, 
           MIN_DISTANCE_CHANGE_FOR_UPDATES, this); 
         Log.d("GPS Enabled", "GPS Enabled"); 
         if (locationManager != null) { 
          location = locationManager 
            .getLastKnownLocation(LocationManager.GPS_PROVIDER); 
          if (location != null) { 
           latitude = location.getLatitude(); 
           longitude = location.getLongitude(); 
          } 
         } 
        } 
       } 
      } 

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

     return location; 
    } 

    /** 
    * Stop using GPS listener 
    * Calling this function will stop using GPS in your app 
    * */ 
    public void stopUsingGPS(){ 
     if(locationManager != null){ 
      locationManager.removeUpdates(AppLocationService.this); 
     } 
    } 

    /** 
    * Function to get latitude 
    * */ 
    public double getLatitude(){ 
     if(location != null){ 
      latitude = location.getLatitude(); 
     } 

     // return latitude 
     return latitude; 
    } 

    /** 
    * Function to get longitude 
    * */ 
    public double getLongitude(){ 
     if(location != null){ 
      longitude = location.getLongitude(); 
     } 

     // return longitude 
     return longitude; 
    } 

    /** 
    * Function to check GPS/wifi enabled 
    * @return boolean 
    * */ 
    public boolean canGetLocation() { 
     return this.canGetLocation; 
    } 

    /** 
    * Function to show settings alert dialog 
    * On pressing Settings button will lauch Settings Options 
    * */ 
    public void showSettingsAlert(){ 
     AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext); 

     // Setting Dialog Title 
     alertDialog.setTitle("GPS is settings"); 

     // Setting Dialog Message 
     alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?"); 

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

     // on pressing cancel button 
     alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
       dialog.cancel(); 
      } 
     }); 

     // Showing Alert Message 
     alertDialog.show(); 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
    } 

    @Override 
    public void onProviderDisabled(String provider) { 
    } 

    @Override 
    public void onProviderEnabled(String provider) { 
    } 

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

    @Override 
    public IBinder onBind(Intent arg0) { 
     return null; 
    } 

} 

Answer 1

使用FusedLocationApi可获得更好的结果。 检查这些链接

http://javapapers.com/android/android-location-fused-provider/

http://www.vogella.com/tutorials/AndroidLocationAPI/article.html

Answer 2

你应该使用谷歌Play服务的位置API

设置你的谷歌播放服务：https://developers.google.com/android/guides/setup

添加到您的清单

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.google.android.gms.location.sample.basiclocationsample" > 

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> 
</manifest> 

声明位置客户

private FusedLocationProviderClient mFusedLocationClient; 

// .. 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // ... 

     mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this); 
    } 

获取用户的最后位置

mFusedLocationClient.getLastLocation() 
     .addOnSuccessListener(this, new OnSuccessListener<Location>() { 
      @Override 
      public void onSuccess(Location location) { 
       // Got last known location. In some rare situations this can be null. 
       if (location != null) { 
        // ... 
       } 
      } 
     }); 

编号： https://developer.android.com/training/location/retrieve-current.html

Answer 3

尝试调用你的方法来获取用户的经度和纬度在

@Override 
public void onLocationChanged(Location location) { 
}