不能到我的收藏

Question

添加對象的名單在我的主要活動，我有兩個列表：

private List<Feed> feedItems; 

private ArrayList<Object> adItems() { 
    ArrayList<Object> adItems = new ArrayList<>(); 
    adItems.add("image"); 
    adItems.add("image"); 
    adItems.add("image"); 
    return adItems; 
} 

第一個列表代表我feedItems，這是從我的網絡模型中得到的。第二個列表只是一個靜態圖像列表。我正在嘗試設置原生廣告，但我只是後退一步，只是提供圖像的Feed以證明覆蓋我的RecyclerAdapter以生成多個視圖。

feedRecyclerAdapter = new FeedRecyclerAdapter(this, feedItems, new ImageLoader(new FeedItemFileCache(this)), adItems()); 

在這裏，我通過我的adItems（）在我的FeedRecyclerAdapter作爲最後paramater對象列表，並在適配器類本身我把它在構造函數中：

public FeedRecyclerAdapter(Context context, List<Feed> feedItems, ImageLoader feedItemImageLoader, List<Object> adItems) { 
    this.context = context; 
    this.feedItems = feedItems; 
    this.feedItemImageLoader = feedItemImageLoader; 
    feedItems.addAll(adItems); 
} 

最後一行feedItems.addAll(adItems);在這裏我得到了以下錯誤消息：

Error:(43, 18) error: no suitable method found for addAll(List<Object>) 
method Collection.addAll(Collection<? extends Feed>) is not applicable 
(argument mismatch; List<Object> cannot be converted to Collection<? extends Feed>) 
method List.addAll(Collection<? extends Feed>) is not applicable 
(argument mismatch; List<Object> cannot be converted to Collection<? extends Feed>) 

我的飼料對象是這樣的：

public class Feed { 
    public static final String CLASS_NAME = "Feed"; 
    public static final String MARKET_CLASS_NAME = "MarketFeed"; 

    private String objectId; 
    private String createdAt; 
    /** 
    * Can be a ParsePointer but we are using a relational include query to get the whole object 
    */ 
    private Design designId; 

    // Not part of the model, calculated at run time. 
    private String timestampText; 
    private boolean isInPersonalGallery; 
    private boolean isLiked; 
    private List<Comment> comments; 

    // Related to Market Feed Items 
    private DisplayedSide displayedSide = DisplayedSide.FRONT; 

    public enum DisplayedSide { 
     FRONT, 
     BACK 
    } 

    public String getObjectId() { 
     return objectId; 
    } 

    public Design getDesign() { 
     return designId; 
    } 

    public Date getCreatedAt() { 
     DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.getDefault()); 
     Date date = null; 
     try { 
      date = dateFormat.parse(createdAt); 
     } catch (ParseException e) { 
      e.printStackTrace(); 
      Log.d("Feed", "Couldn't parse createdAt date when requested " + createdAt); 
     } 

     return date; 
    } 

    public String getTimestampText() { 
     return timestampText; 
    } 

    public void setTimestampText(String timestampText) { 
     this.timestampText = timestampText; 
    } 

    public boolean isInPersonalGallery() { 
     return isInPersonalGallery; 
    } 

    public void setInPersonalGallery(boolean inPersonalGallery) { 
     isInPersonalGallery = inPersonalGallery; 
    } 

    public boolean isLiked() { 
     return isLiked; 
    } 

    public void setLiked(boolean liked) { 
     isLiked = liked; 
    } 

    public List<Comment> getComments() { 
     return comments; 
    } 

    public void setComments(List<Comment> comments) { 
     this.comments = comments; 
    } 

    public DisplayedSide getDisplayedSide() { 
     return displayedSide; 
    } 

    public void setDisplayedSide(DisplayedSide displayedSide) { 
     this.displayedSide = displayedSide; 
    } 
} 

總之，我試圖在我的Collection中的主對象feedItems之間撒上一些圖像或adItems。爲什麼我不能簡單地將它們附加到我的主要列表中？我能做些什麼呢？