SparseBooleanArray - 删除的键，在 Listview 自定义适配器中回收视图时返回答案

【问题标题】：SparseBooleanArray - deleted key, goes back when view recycled in Listview Custom AdapterSparseBooleanArray - 删除的键，在 Listview 自定义适配器中回收视图时返回
【发布时间】：2014-08-12 21:25:40
【问题描述】：

我有一个自定义适配器，在每个项目视图中我都有喜欢和不喜欢按钮。我正在使用 SparseBooleanArray 将整数映射到布尔值。在我的自定义适配器的 getView 中，我定义了这些 SparseBooleanArray：

    private final SparseBooleanArray LikedPositions     = new SparseBooleanArray();
    private final SparseBooleanArray DislikedPositions  = new SparseBooleanArray();

然后，根据 API 检索到的数据，我将它们填写如下：

    if (Like_with_user == true){
            LikedPositions.put(position, true);
    }

    if (Dislike_with_user == true){
        DislikedPositions.put(position, true);
    }

在这一步之后，我设置了喜欢和不喜欢按钮的背景：

    if(LikedPositions.get(position)){
        holder.video_Like.setBackgroundResource(R.drawable.like_pressed);
    }else{
        holder.video_Like.setBackgroundResource(R.drawable.like_normal);
    }


    if(DislikedPositions.get(position)){
        holder.video_Dislike.setBackgroundResource(R.drawable.dislike_pressed);
    }else{
        holder.video_Dislike.setBackgroundResource(R.drawable.dislike_normal);
    }

在此之后，我将 OnClickListener 设置为喜欢和不喜欢按钮：

    holder.video_Like.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View like) {

            int likeposition        = (Integer) like.getTag(R.string.Position);
            RelativeLayout layout   = (RelativeLayout) like.getParent();
            Button BtnLike          = (Button) layout.getChildAt(0);
            Button BtnDislike       = (Button) layout.getChildAt(1);

            if(DislikedPositions.get(likeposition)){
                BtnDislike.setBackgroundResource(R.drawable.dislike_normal);
                DislikedPositions.delete(likeposition);
                System.out.println("Dislike: "+DislikedPositions);
            }

            if(LikedPositions.get(likeposition)){
                BtnLike.setBackgroundResource(R.drawable.like_normal);
                LikedPositions.delete(likeposition);
                System.out.println("like: "+LikedPositions);
            }else{
                scale.setDuration(300);
                scale.setInterpolator(new OvershootInterpolator());
                BtnLike.startAnimation(scale);
                BtnLike.setBackgroundResource(R.drawable.like_pressed);
                LikedPositions.put(likeposition, true);
                System.out.println("like: "+LikedPositions);
            }
        }
    });

问题就在这里，当我单击按钮时，一切正常，添加和删除键！但是当我滚动列表视图并查看回收时，已删除的键又回来了！为什么？！

Ps：我将这些标签设置为喜欢和不喜欢按钮：

    holder.video_Like.setTag(R.string.Position, position);
    holder.video_Like.setTag(R.string.Video_ID, VIDEO_ID);

更新：我的自定义适配器 getview：

    private final SparseBooleanArray LikedPositions     = new SparseBooleanArray();
    private final SparseBooleanArray DislikedPositions  = new SparseBooleanArray();

@Override
    public View getView(int position, View convertView, ViewGroup parent) {


        User_Session            = new SessionManagement(mActivity);

        View vi             = convertView;
        ViewHolder holder   = null;

        HashMap<String, String> mVideo  = new HashMap<String, String>();
        mVideo              = mData.get(position);

        VIDEO_URL           = mVideo.get("VIDEO_URL");
        VIDEO_ID            = mVideo.get("VIDEO_ID");
        LIKE_W_USER         = mVideo.get("LIKE_W_USER");
        DISLIKE_W_USER      = mVideo.get("DISLIKE_W_USER");     
        Like_with_user      = Boolean.parseBoolean(LIKE_W_USER);
        Dislike_with_user   = Boolean.parseBoolean(DISLIKE_W_USER);


        final String videoUid           = mVideo.get("uid");

        if(convertView == null) {
            vi      = mInflater.inflate(R.layout.layout_list_row, null);
            holder  = new ViewHolder();
            holder.video_Like           = (Button) vi.findViewById(R.id.video_Like);
            holder.video_Dislike        = (Button) vi.findViewById(R.id.video_disLike);
            vi.setTag(holder);

        }else{
            holder = (ViewHolder) vi.getTag();
        }

        holder.video_Like.setTag(R.string.Position, position);
        holder.video_Like.setTag(R.string.Video_ID, VIDEO_ID);
        holder.video_Dislike.setTag(R.string.Position, position);
        holder.video_Dislike.setTag(R.string.Video_ID, VIDEO_ID);

        if(User_Session.isLoggedIn() != true){


            holder.video_Comment.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    LoginWarn();
                }
            });

            holder.video_Like.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    LoginWarn();
                }
            });
            holder.video_Dislike.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    LoginWarn();
                }
            });

        }else{

            HashMap<String, String> user    = User_Session.GetUserDetails();
            final String User_TOKEN         = user.get(SessionManagement.KEY_USERTOKEN);

            if (Like_with_user == true){                                                    // Check that user liked this video before or not
                LikedPositions.put(position, true);
            }

            if (Dislike_with_user == true){                                                 // Check that user disliked this video before or not
                DislikedPositions.put(position, true);
            }

            if(LikedPositions.get(position)){                                               // Highlight Like Sign if user liked it before
                holder.video_Like.setBackgroundResource(R.drawable.like_pressed);
            }else{
                holder.video_Like.setBackgroundResource(R.drawable.like_normal);
            }

            if(DislikedPositions.get(position)){                                            // Highlight dislike Sign if user disliked it before
                holder.video_Dislike.setBackgroundResource(R.drawable.dislike_pressed);
            }else{
                holder.video_Dislike.setBackgroundResource(R.drawable.dislike_normal);
            }


            holder.video_Like.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {

                    int position            = (Integer) v.getTag(R.string.Position);
                    RelativeLayout layout   = (RelativeLayout) v.getParent();
                    Button BtnLike          = (Button) layout.getChildAt(0);
                    Button BtnDislike       = (Button) layout.getChildAt(1);

                    Ion.with(mActivity).load(Constants.Like_URL+v.getTag(R.string.Video_ID)+"/?token="+User_TOKEN).asString()
                    .setCallback(new FutureCallback<String>(){

                        @Override
                        public void onCompleted(Exception e, String result) {

                            if(e != null){
                                Toast.makeText(mActivity, "Sorry, Error Happened", Toast.LENGTH_SHORT).show();
                            }
                        }

                    });

                    if(DislikedPositions.get(position)){
                        BtnDislike.setBackgroundResource(R.drawable.dislike_normal);
                        DislikedPositions.delete(position);
                    }

                    if(LikedPositions.get(position)){
                        BtnLike.setBackgroundResource(R.drawable.like_normal);
                        LikedPositions.delete(position);
                    }else{
                        scale.setDuration(300);
                        scale.setInterpolator(new OvershootInterpolator());
                        BtnLike.startAnimation(scale);
                        BtnLike.setBackgroundResource(R.drawable.like_pressed);
                        LikedPositions.put(position, true);
                    }
                }
            });


            holder.video_Dislike.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {

                    int position            = (Integer) v.getTag(R.string.Position);
                    RelativeLayout layout   = (RelativeLayout) v.getParent();
                    Button BtnLike          = (Button) layout.getChildAt(0);
                    Button btnDislike       = (Button) layout.getChildAt(1);

                    Ion.with(mActivity).load(Constants.Dislike_URL+v.getTag(R.string.Video_ID)+"/?token="+User_TOKEN).asString()
                    .setCallback(new FutureCallback<String>(){

                        @Override
                        public void onCompleted(Exception e, String result) {

                            if(e != null){
                                Toast.makeText(mActivity, "Sorry, Error Happened", Toast.LENGTH_SHORT).show();
                            }
                        }

                    });

                    if(LikedPositions.get(position)){
                        BtnLike.setBackgroundResource(R.drawable.like_normal);
                        LikedPositions.delete(position);
                    }

                    if(DislikedPositions.get(position)){
                        btnDislike.setBackgroundResource(R.drawable.dislike_normal);
                        DislikedPositions.delete(position);
                    }else{
                        scale.setDuration(300);
                        scale.setInterpolator(new OvershootInterpolator());
                        btnDislike.startAnimation(scale);
                        btnDislike.setBackgroundResource(R.drawable.dislike_pressed);
                        DislikedPositions.put(position, true);
                    }
                }
            });

        }






        // we're near the end of the list adapter, so load more items
        if (position >= getCount() - 1){
            mSwipe.setRefreshing(true);
            loadmore();
        }




        return vi;
}

【问题讨论】：

请显示您的 getView 方法的完整代码。听起来你没有正确处理它。另外，当一个人可以很容易地做同样的事情时，为什么还要有两个 SparseArrays？
@JaySoyer 我添加了，请查看。
在您的getView() 方法中，您究竟在哪里设置SparseBooleanArrays 的状态？
@Luksprog，首先在API派生的Like_with_user == true和Dislike_with_user == true语句中，其次是当喜欢按钮或不喜欢按钮点击时。
在 OnClickListeners 中获取对 mVideo Hashmap 的引用并更新该行的 LIKE_W_USER 键的值。

标签： android listview android-listview

【解决方案1】：

哇，getView() 中发生了很多事情。顺便说一句，以下看起来确实是错误的。

 // we're near the end of the list adapter, so load more items
 if (position >= getCount() - 1){
     mSwipe.setRefreshing(true);
     loadmore();
 }

每个位置编号可以调用getView() 方法3-4 次。首次显示到屏幕时，可能会或可能不会对所有项目调用它。所以在这里确定何时将更多项目加载到适配器中是非常糟糕的。考虑到你说在你开始滚动之前不会出现问题......我会说这可能是你的罪魁祸首。

您应该做的是将OnScollListener 附加到ListView 并根据您的适配器计数检查ListView.getLastVisiblePosition() 以确定何时加载更多。

另外，在应用此修复之前，我只需删除该段代码，看看是否能解决您的问题。

【讨论】：

我删除了这个片段并尝试了，但它并没有改变任何东西:(
你知道我认为@Luksprog 是对的，我应该更新 mVideo 的 LIKE_W_USER 密钥。