在android中快速一次获取当前位置

Question

谁能给我建议一种简单快速的方法，只需一次就能得到位置？！

Answer 1

给，你可以用这个...

用法示例：

public void foo(Context context) {
  // when you need location
  // if inside activity context = this;

  SingleShotLocationProvider.requestSingleUpdate(context, 
   new SingleShotLocationProvider.LocationCallback() {
     @Override public void onNewLocationAvailable(GPSCoordinates location) {
       Log.d("Location", "my location is " + location.toString());
     }
   });
}

您可能希望验证lat/long是实际值，而不是0或其他值。如果我没记错的话，这不应该抛出一个NPE，但是您可能想要验证这一点。

public class SingleShotLocationProvider {

  public static interface LocationCallback {
      public void onNewLocationAvailable(GPSCoordinates location);
  }

  // calls back to calling thread, note this is for low grain: if you want higher precision, swap the 
  // contents of the else and if. Also be sure to check gps permission/settings are allowed.
  // call usually takes <10ms
  public static void requestSingleUpdate(final Context context, final LocationCallback callback) {
      final LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
      boolean isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
      if (isNetworkEnabled) {
          Criteria criteria = new Criteria();
          criteria.setAccuracy(Criteria.ACCURACY_COARSE);
          locationManager.requestSingleUpdate(criteria, new LocationListener() {
              @Override
              public void onLocationChanged(Location location) {
                  callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
              }

              @Override public void onStatusChanged(String provider, int status, Bundle extras) { }
              @Override public void onProviderEnabled(String provider) { }
              @Override public void onProviderDisabled(String provider) { }
          }, null);
      } else {
          boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
          if (isGPSEnabled) {
              Criteria criteria = new Criteria();
              criteria.setAccuracy(Criteria.ACCURACY_FINE);
              locationManager.requestSingleUpdate(criteria, new LocationListener() {
                  @Override
                  public void onLocationChanged(Location location) {
                      callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
                  }

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


  // consider returning Location instead of this dummy wrapper class
  public static class GPSCoordinates {
      public float longitude = -1;
      public float latitude = -1;

      public GPSCoordinates(float theLatitude, float theLongitude) {
          longitude = theLongitude;
          latitude = theLatitude;
      }

      public GPSCoordinates(double theLatitude, double theLongitude) {
          longitude = (float) theLongitude;
          latitude = (float) theLatitude;
      }
  }  
}