检测Android机器是否有GPS模块的代码

public boolean hasGPSDevice(Context context)      {          final LocationManager mgr = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);          if ( mgr == null )              return false;          final List<String> providers = mgr.getAllProviders();          if ( providers == null )               return false;          return providers.contains(LocationManager.GPS_PROVIDER);      }