Question

您好我正在尝试使用网络提供商和GPS提供商获取GPS。但我得到相同的值。该值未更新。我的onlocation值是noy更新。

   private Location networkLoc;
   private Location gpsLoc;
   private static double lat;
   private static  TextView latituteField1;
   private static TextView longitudeField1; 
   private static double lng ;
   private static double  lat1;
   private static double lng1 ;
   provider = locationManager.getBestProvider(criteria, false);
   networkLoc = locationManager.getLastKnownLocation(provider);
   gpsLoc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

 if (networkLoc != null) {
System.out.println("Provider " + provider + " has been selected.");
  lat1 = (double) (networkLoc.getLatitude());
 lng1 = (double) (networkLoc.getLongitude());
latituteField.setText(Double.toString(lat1));
longitudeField.setText(Double.toString(lng1));
  } 
  if ( gpsLoc  != null) {
System.out.println("Provider " + provider + " has been selected.");
     lat = (double) (gpsLoc.getLatitude());
 lng = (double) (gpsLoc.getLongitude());
latituteField1.setText(Double.toString(lat));
longitudeField1.setText(Double.toString(lng));

     }
@Override
public void onLocationChanged(Location location) {
  lat1 = (double) (networkLoc.getLatitude());
     lng1 = (double) (networkLoc.getLongitude());
    latituteField.setText(Double.toString(lat1));//these two values are same
    longitudeField.setText(Double.toString(lng1));      
    lat = (double) (gpsLoc.getLatitude());
     lng = (double) (gpsLoc.getLongitude());
    latituteField1.setText(Double.toString(lat));//these two values are same
    longitudeField1.setText(Double.toString(lng));              
     }

Answer 1

我会好好看一下这篇博文：A Deep Dive Into Location。它将为您提供一些最佳实践。调用getLastKnownLocation不会启动位置提供程序。您应该使用requestLocationUpdates。请参阅以下代码段：

LocationManager lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);

Criteria fineCriteria.setAccuracy(Criteria.ACCURACY_FINE);
String fineProvider = lm.getBestProvider(fineCriteria, true);

// Start the fine location listener
lm.requestLocationUpdates(fineProvider, 0, 0, locationListenerFine);

private LocationListener locationListenerFine = new LocationListener() {
    public void onLocationChanged(Location location) {

    }

    public void onProviderDisabled(String provider) {
    }

    public void onProviderEnabled(String provider) {
    }

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

无法使用gps提供商和网络提供商获取更新位置？

1 个答案: