我有一个 RecyclerView，它显示了两种 View，一种代表用户发布，另一种代表事件发布。两者都有共同的元素，例如显示时间戳的 TextView。所以我创建了一个 PublicationViewHolder ，它将这个 TextView 时间戳放入一个变量中并加载它。我的问题是适配器最初加载了正确的值，但是当我向下滚动并再次向上滚动时，位置中的值会被其他位置的值更改。代码如下:

public class PublicationViewHolder extends RecyclerView.ViewHolder {

    private TextView vTimeStamp;

    public PublicationViewHolder(View itemView) {
        super(itemView);
        this.vTimeStamp = (TextView) itemView.findViewById(R.id.txt_view_publication_timestamp);
    }

    public void load(Publication publication, int i) {
        load(publication);
        try {
            if (Publication.TYPE_USER_PUBLICATION == publication.getType()) {
                load((UserPublication) publication);
            } else if (Publication.TYPE_EVENT_PUBLICATION == publication.getType()) {
                load((EventPublication) publication);
            }
        } catch (ClassCastException e) {
            throw new RuntimeException("Publication type cast fail. See PublicationViewHolder.");
        }
    }

    public void load(Publication publication) {
        vTimeStamp.setText(DateFormatter.getTimeAgo(publication.getTimeStamp()));
    }

    public void load( UserPublication publication) {
        //This method is override by UserPublicationViewHolder
    };

    public void load( EventPublication publication) {
        //This method is override by EventPublicationViewHolder
    };

}

现在我将为用户发布我的 UserPublicationViewHolder。

public class UserPublicationViewHolder extends PublicationViewHolder {
    private  ImageView vImageView, vLikeButton, vDislikeButton, vFavButton, vEditPost, vDeletePost;
    private  TextView vText, vUsername, vLikeCount, vDislikeCount, vFavCount;
    private  PostImagesLayout vImagesContainer;
    private TagCloudLocationFriends tagsView;

    public UserPublicationViewHolder(View itemView) {
        super(itemView);
        vImageView = (ImageView) itemView.findViewById(R.id.img_view_publication_user);
        vText = (TextView) itemView.findViewById(R.id.txt_view_publication_text);

        vLikeCount = (TextView) itemView.findViewById(R.id.txt_view_like_count);
        vFavCount = (TextView) itemView.findViewById(R.id.txt_view_fav_count);
        vDislikeCount = (TextView) itemView.findViewById(R.id.txt_view_dislike_count);

        vUsername = (TextView) itemView.findViewById(R.id.txt_view_publication_user_name);
        vLikeButton = (ImageView) itemView.findViewById(R.id.img_view_like);
        vDislikeButton  = (ImageView) itemView.findViewById(R.id.img_view_dislike);
        vFavButton  = (ImageView) itemView.findViewById(R.id.img_view_fav);
        vImagesContainer = (PostImagesLayout) itemView.findViewById(R.id.container_post_images);

        tagsView = (TagCloudLocationFriends) itemView.findViewById(R.id.location_friends_tag);

        // edit - remove icons
        vDeletePost = (ImageView) itemView.findViewById(R.id.img_view_delete_post);
        vEditPost = (ImageView) itemView.findViewById(R.id.img_view_edit_post);
    }


    @Override
    public void load(UserPublication publication) {
        //Load the UserPublicationViewHolder specific views.
    }
}

现在我将做同样的事情，但对于事件出版物

public class EventPublicationViewHolder extends PublicationViewHolder {

    private TextView vTextViewTitle;
    private TextView vTextViewText;

    public EventPublicationViewHolder(View itemView) {
        super(itemView);
        vTextViewTitle = (TextView) itemView.findViewById(R.id.txt_view_publication_event_title);
        vTextViewText = (TextView) itemView.findViewById(R.id.txt_view_publication_event_text);
    }

    @Override
    public void load(EventPublication publication) {
        //Load the EventPublicationViewHolder specifics views
    }
}

现在这是我的 RecyclerView 适配器:

public class PublicationAdapter extends RecyclerView.Adapter<PublicationViewHolder> {

    public static final int USER_PUBLICATION_TYPE = 1;
    public static final int EVENT_PUBLICATION_TYPE = 2;
    private List<Publication> publications = new ArrayList<Publication>();

    public List<Publication> getPublications() {
        return publications;
    }

    public void setPublications(List<Publication> publications) {
        this.publications = publications;
    }

    @Override
    public int getItemViewType(int position) {
        if (publications.get(position) instanceof UserPublication) {
            return USER_PUBLICATION_TYPE;
        }
        if (publications.get(position) instanceof EventPublication) {
            return EVENT_PUBLICATION_TYPE;
        }
        throw new RuntimeException("Unknown view type in PublicationAdapter");
    }

    @Override
    public PublicationViewHolder onCreateViewHolder(ViewGroup viewGroup, int type) {
        View v;
        switch (type) {
            case USER_PUBLICATION_TYPE:
                v = LayoutInflater.from(getActivity()).inflate(R.layout.view_holder_user_publication, viewGroup, false);
                return new UserPublicationViewHolder(v);
            case EVENT_PUBLICATION_TYPE:
                v = LayoutInflater.from(getActivity()).inflate(R.layout.view_holder_event_publication, viewGroup, false);
                return new EventPublicationViewHolder(v);
        }
        return null;
    }

    @Override
    public void onBindViewHolder(PublicationViewHolder aPublicationHolder, int i) {
        aPublicationHolder.load(publications.get(i), i);
    }

    @Override
    public long getItemId(int position) {
        //Here I tried returning only position or 0 without luck.
        //The id is unique BTW
        return publications.get(position).getId();
    }

    @Override
    public int getItemCount() {
        return publications.size();
    }

}

我不知道有什么问题，UserPublication 和 EventPublication 都是从 Publication 扩展而来的。我没有做一些请求或重新加载适配器。我只加载一次适配器。

更新:

顺便说一句，我在 Fragment 中使用此 RecyclerView，该 RecyclerView 加载在 PageAdapter 中，该 PageAdapter 加载在 Fragment 内的 ViewPager 中，这可能是问题吗？

更新: 这是另一个绑定(bind)代码。

这是UserPublicationViewHolder的加载方法。

    @Override
    public void load(UserPublication publication) {
        PicassoHelper.publicationUser(getActivity(), publication.getUser().getAvatarUrl(),
                vImageView);
        vText.setText(publication.getText());
        vUsername.setText(publication.getUser().getName());
        boolean hasLocation = false;
        if (publication.getImages().length > 0) {
            vImagesContainer.setImages(publication.getImages());
        } else {
            vImagesContainer.setVisibility(View.GONE);
        }
        tagsView.setTags(new ArrayList<MinikastTag>());
        tagsView.drawTags();

        if(publication.getLocation() != null || publication.getTaggedFriends().size() > 0){
            if(publication.getLocation() != null){
                hasLocation = true;
                tagsView.add(new MinikastTag(1,"Post from ",1));
                tagsView.add(new MinikastTag(2, publication.getLocation().getName(), 2));
            }
            if(publication.getTaggedFriends().size() > 0){
                if(hasLocation)
                    tagsView.add(new MinikastTag(3," with ",1));
                else
                    tagsView.add(new MinikastTag(3,"With ",1));

                int i = 0;
                for(User aUser: publication.getTaggedFriends()){
                    MinikastTag aTag;
                    if(i == publication.getTaggedFriends().size() - 1 ) {
                        aTag = new MinikastTag(4, aUser.getName(), 3);
                        aTag.setUserID(aUser.getId());
                        aTag.setUserName(aUser.getName());
                        tagsView.add(aTag);
                    } else {
                        aTag = new MinikastTag(4, aUser.getName() + ", ", 3);
                        aTag.setUserID(aUser.getId());
                        aTag.setUserName(aUser.getName());
                        tagsView.add(aTag);
                    }
                    i = i+1;
                }
            }
        }
        tagsView.drawTags();

        // likes, dislikes, favs
        if(publication.getLikesAmount() > 0)
            vLikeCount.setText(String.valueOf(publication.getLikesAmount()));

        if(publication.getDislikesAmount() > 0)
            vDislikeCount.setText(String.valueOf(publication.getDislikesAmount()));

        if(publication.getLovesAmount() > 0)
            vFavCount.setText(String.valueOf(publication.getLovesAmount()));

        // reset buttons
        vFavButton.setPressed(false);
        vDislikeButton.setPressed(false);
        vLikeButton.setPressed(false);

        if(publication.getRelationship().equals("LOVE"))
            vFavButton.setPressed(true);
        else if (publication.getRelationship().equals("LIKE"))
            vLikeButton.setPressed(true);
        else if (publication.getRelationship().equals("DISLIKE"))
            vDislikeButton.setPressed(true);

        // edit - remove icons

        if(String.valueOf(publication.getUser().getId()).equals(StartupSharedPreferences.getProfileId())){
            vEditPost.setVisibility(View.VISIBLE);
            vDeletePost.setVisibility(View.VISIBLE);
        }else{
            vEditPost.setVisibility(View.INVISIBLE);
            vDeletePost.setVisibility(View.INVISIBLE);
        }
    }
}

这是EventPublicationViewHolder的加载方法:

@Override
public void load(EventPublication publication) {
    vTimeStamp.setVisibility(View.GONE);
    itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //GoTo.eventDetail(getActivity(), publication);
        }
    });
    vTextViewTitle.setText(publication.getTitle());
    vTextViewText.setText(publication.getText());
}

我评论了一些代码只是因为我在测试，但正如你所见，我只做 setTexts 和 assing 一些图像。

这就是我在 fragment 的 onViewCreated 方法中设置适配器、LinearLayoutManager 等的方式。

vRecyclerView = (FixedRecyclerView) view.findViewById(R.id.recycler_view_publications);
        vSwipeRefresh = (SwipeRefreshLayout) view.findViewById(R.id.swipe_container);
        mFeedCallback.onScrollReady(vRecyclerView);
        mLayoutManager = buildLayoutManager();
        vRecyclerView.setLayoutManager(mLayoutManager);
        vRecyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL_LIST));
        mAdapter = new PublicationAdapter();
        vSwipeRefresh.setOnRefreshListener(this);
        vSwipeRefresh.setColorSchemeResources(R.color._SWIPER_COLOR_1, R.color._SWIPER_COLOR_2,
                R.color._SWIPER_COLOR_3, R.color._SWIPER_COLOR_4);
        vRecyclerView.setAdapter(mAdapter);

顺便说一句，适配器是在我拥有的自定义方法中加载数据集的，称为 onHttpClientReady，但这似乎不是问题。

以下是一些截图:

我第一次进入应用时的列表顶部:

然后当我回来时:

顺便说一句，喜欢，不喜欢和喜欢的按钮，如果有人多次点击它们，将显示一个数值，如果是，这些值也会错位。

更新: 现在我知道那不是因为嵌套的 fragment 。我更改了我的代码，现在，每个选项卡 fragment 都位于 Activity 内部的 ViewPager 内部的 PageStateAdapter 中。但问题仍然存在。

更新: 我发现 getItemId 方法永远不会被执行，IDK 为什么呢。

最佳答案

这通常发生在您有类似“if (field != null) holder.setField(field)”之类的内容时，而没有 else。持有人被回收，这意味着它将在那里有值，所以你需要清理或替换每个值，如果它是 null 你应该 nullit，如果不是，你应该写它，总是。已经晚了，但是，作为其他人的答案。

关于android - RecyclerView 适配器采用错误的值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28031875/