java - 使用 GSON 和 Retrofit 时反序列化内部类

Question

我的 API 响应如下:

 "stories": [
    {
      "id": 3509,
      "title": "Greece financial crises ",
      "isBreaking": "0",
      "updated": "1435719565",
      "readers": "0",

      "feed": [
        {
          "feed_id": "2",
          "title": "cnn",
          "logo_url": "http:\\/\\/cnn.com\\/images\\/logo.gif",
          "site_url": "http:\\/\\/cnn.com\\/news.php\\/"
        }
      ]
    },

为此，我创建了两个类。第一个是 StoryAbstact 类，其字段 feed 类型为 Feeds class

 public class StoryAbstract {

        private long id;
        private String title;
        private int isBreaking;
        private Long updated;
        private long readers;
        private String date;
        private String image;
        private List<Feeds> feed;
        ..
        // getters and getters
        public List<Feeds> getFeed() {
            return feed;
        }

        public void setFeed(List<Feeds> feed) {
            this.feed = feed;
        }

        ....
        ....

第二个类是Feeds，例如:

public class Feeds {
    private int feed_id;
    private String title;
    private String logo_url;
    private String site_url;
    ..
        // getters & setters
    public int getFeed_id() {
        return feed_id;
    }

    public void setFeed_id(int feed_id) {
        this.feed_id = feed_id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getLogo_url() {
        return logo_url;
    }

    public void setLogo_url(String logo_url) {
        this.logo_url = logo_url;
    }

    public String getSite_url() {
        return site_url;
    }

    public void setSite_url(String site_url) {
        this.site_url = site_url;
    }

    //setters
}

我想在我的 recyclerView 适配器中显示来自两个类(StoryAbstract 和 Feeds)的信息，为此，我能够从第一类获取反序列化的数据，但是仅第二类为空。

我认为这是由于第二类没有反序列化，我无法解决它。我正在使用 Retrofit 1.9.0。

请帮忙...

编辑

我已遵循以下答案，但没有一个能解决我的问题。我相信当我在适配器中调用 Feed 类时出现了一些问题。我的适配器代码如下:

 private static class ViewHolderItem extends RecyclerView.ViewHolder implements View.OnClickListener {

        private final TextView txtTitle;
        private final ImageView imageIcon;
        private final TextView feedName;
        private Context context;
        private StoryAbstract story;
        private TextView timeStamp;
        private Feeds feed;

        public ViewHolderItem(View itemView, Context context) {
            super(itemView);

            this.context = context;
            txtTitle = (TextView) itemView.findViewById(R.id.list_item_title);
            imageIcon = (ImageView) itemView.findViewById(R.id.list_item_image);
            feedName = (TextView) itemView.findViewById(R.id.feedName);
                   itemView.setOnClickListener(this);
        }

        public void bindStory(StoryAbstract story) {
            this.story = story;
            txtTitle.setText(story.getTitle());
            feedName.setText(feed.getTitle());
            String imageUrl = story.getImageUrl();
            if (!TextUtils.isEmpty(imageUrl)) {
                Ion.with(imageIcon)
                        .placeholder(R.drawable.loading)
                        .error(R.drawable.loading)
                        .load(imageUrl);
                imageIcon.setVisibility(View.VISIBLE);
            } else {
                imageIcon.setVisibility(View.GONE);
            }
        }

feedName.setText(feed.getTitle()); 返回 null

Answer 1

试试这个:

public class JsonModel implements Serializable {

    private static final long serialVersionUID = -6186015239095323524L;

}

public class Feed extends JsonModel {
  private static final long serialVersionUID = -8152796378433288199L;

  @SerializedName("feed_id")
  private int feedId;

  @SerializedName("title")
  private String title;

  @SerializedName("logo_url")
  private String logoUrl;

  @SerializedName("site_url")
  private String siteUrl;

  public int getFeedId() {
    return feedId;
  }

  public void setFeedId(int feedId) {
      this.feedId = feedId;
  }

  public String getTitle() {
     return title;
  }

  public void setTitle(String title) {
    this.title = title;
  }

  public String getLogoUrl() {
    return logoUrl;
  }

  public void setLogoUrl(String logoUrl) {
    this.logoUrl = logoUrl;
  }

  public String getSiteUrl() {
    return siteUrl;
  }

  public void setSiteUrl(String siteUrl) {
    this.siteUrl = siteUrl;
  }

}

public class StoryAbstract extends JsonModel{

private static final long serialVersionUID = 1269037550260848268L;

@SerializedName("id")
private long id;

@SerializedName("title")
private String title;

@SerializedName("isBreaking")
private int isBreaking;

@SerializedName("updated")
private long updated;

@SerializedName("readers")
private long readers;

@SerializedName("feed")
private Feed feed;

public long getId() {
    return id;
}

public void setId(long id) {
    this.id = id;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public int getIsBreaking() {
    return isBreaking;
}

public void setIsBreaking(int isBreaking) {
    this.isBreaking = isBreaking;
}

public long getUpdated() {
    return updated;
}

public void setUpdated(long updated) {
    this.updated = updated;
}

public long getReaders() {
    return readers;
}

public void setReaders(long readers) {
    this.readers = readers;
}

public Feed getFeed() {
    return feed;
}

public void setFeed(Feed feed) {
    this.feed = feed;
}

}

最后:

public class StoriesResponse extends JsonModel{
private static final long serialVersionUID = -2329376390030680204L;

@SerializedName("stories")
private List<StoryAbstract> storyAbstracts;

public List<StoryAbstract> getStoryAbstracts() {
    return storyAbstracts;
}

public void setStoryAbstracts(List<StoryAbstract> storyAbstracts) {
    this.storyAbstracts = storyAbstracts;
}

}

只需在您的 Retrofit 回调中添加 StoriesResponse 即可。