Android Studio：房间：错误：找不到字段的吸气剂

Posted 2023-04-19

【中文标题】Android Studio：房间：错误：找不到字段的吸气剂

【英文标题】：Android Studio: Room: error: Cannot find getter for field

【发布时间】：2020-02-24 08:38:31

【问题描述】：

我正在使用房间数据库进行本地缓存。在我的实体中，我有其他对象，它们的 getter 具有与其用途相关的接口的返回类型。但是房间找不到字段的吸气剂。我的目标是将这些接口用作返回类型，以便我可以将来自多个远程源的数据添加到一个数组中。如何在实现灵活和良好抽象的同时做到这一点？

public interface Venue 
  Location getLocation();
  Contact getContact();


public interface Location 
  double getLongitude();
  double getLatitude();


public interface Contact 
  String getPhoneNumber();
  String getFacebookUsername();


public class VenueSourceOne implements Venue
   private VenueSourceOneLocation venueSourceOneLocation;
   private VenueSourceOneContact venueSourceOneContact;

   Location getLocation()
      return venueSourceOneLocation;
   

   Contact getContact()
      return venueSourceOneContact
   


public class VenueSourceTwo implements Venue
   private VenueSourceTwoLocation venueSourceTwoLocation;
   private VenueSourceTwoContact venueSourceTwoContact;

   Location getLocation()
      return venueSourceTwoLocation;
   

   Contact getContact()
      return venueSourceTwoContact
   



public class Main
   ....add to a List<Venue> and do something on the UI

【参考方案1】：

出于我提出的问题以外的原因，我将场地接口更改为抽象类：

来自

public interface Venue 
  Location getLocation();
  Contact getContact();

到

public abstract class Venue 
      public abstract Location getLocation();
      public abstract Contact getContact();

我的问题的真正解决方案如下：

来自

public class VenueSourceOne implements Venue
   private VenueSourceOneLocation venueSourceOneLocation;
   private VenueSourceOneContact venueSourceOneContact;

   Location getLocation()
      return venueSourceOneLocation;
   

   Contact getContact()
      return venueSourceOneContact
   


public class VenueSourceTwo implements Venue
   private VenueSourceTwoLocation venueSourceTwoLocation;
   private VenueSourceTwoContact venueSourceTwoContact;

   Location getLocation()
      return venueSourceTwoLocation;
   

   Contact getContact()
      return venueSourceTwoContact
   

到

public class VenueSourceOne extends Venue
   private VenueSourceOneLocation location;
   private VenueSourceOneContact contact;

   @Override
   VenueSourceOneLocation getLocation()
      return location;
   

   @Override
   VenueSourceOneContact getContact()
      return contact;
   


public class VenueSourceTwo extends Venue
   private VenueSourceTwoLocation location;
   private VenueSourceTwoContact contact;

   @Override
   VenueSourceTwoLocation getLocation()
      return location;
   

   @Override
   VenueSourceTwoContact getContact()
      return contact;
   

列表在从源中检索数据时会使用抽象类指定的通用类型，而房间会使用特定类型存储数据。