本文介绍了如何停止的ListView回收?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我是一个机器人初学者,我想不通为什么会这样。请帮忙!

活动截图:

一切正常,除了当我向下滚动(因此我认为这与回收做)......所以,当我向后滚动起来,试图撤消后的第一个投票(红色箭头)...它认为职位是否决!此外,它也可能认为向下票ImageButton的绘制是空的 - 见code)。如果我不滚动,它完美的作品。

getView code:

 公共查看getView(INT位置,查看convertView,父母的ViewGroup){
    ViewHolder持有人;
    如果(convertView == NULL){
        持有人=新ViewHolder();
        //充气列表项
        convertView = this.inflater.inflate(R.layout.row_layout,父母,假);
        //获取意见
        holder.profilePic =(ImageView的)convertView.findViewById(R.id.profilePic);
        holder.username =(TextView中)convertView.findViewById(R.id.username);
        holder.day =(TextView中)convertView.findViewById(R.id.day);
        holder.rating =(TextView中)convertView.findViewById(R.id.rating);
        holder.textPost =(TextView中)convertView.findViewById(R.id.textPost);
        holder.ratingUp =(的ImageButton)convertView.findViewById(R.id.ratingUp);
        holder.ratingDown =(的ImageButton)convertView.findViewById(R.id.ratingDown);
        convertView.setTag(保持器);    }其他{
        支架=(ViewHolder)convertView.getTag();
    }    。最终绘制对象up_clicked = context.getResources()getDrawable(R.drawable.ic_action_rate_up_clicked);
    最终绘制对象up_unClicked = context.getResources()getDrawable(R.drawable.ic_action_rate_up)。
    最终绘制对象down_clicked = context.getResources()getDrawable(R.drawable.ic_action_rate_down_clicked)。
    最终绘制对象down_unClicked = context.getResources()getDrawable(R.drawable.ic_action_rate_down)。    后后= cityFeed.get(位置);
    holder.profilePic.setImageResource(post.getDrawableID());
    holder.username.setText(post.getUsername());
    holder.day.setText(post.getDay());
    holder.rating.setText(post.getRating());
    holder.textPost.setText(post.getText());    DB =新数据库处理器(背景);
    字符串userVotesUp = NULL;
    userVotesUp = db.getUserVotes(上);
    如果(userVotesUp == NULL){
        userVotesUp =;
    }
    字符串userVotesDown = NULL;
    userVotesDown = db.getUserVotes(下);
    如果(userVotesDown == NULL){
        userVotesDown =;
    }
    字符串postid = post.getPostID();
    如果(userVotesUp.contains(帖子ID)){
        holder.ratingUp.setImageDrawable(up_clicked);
    }否则如果(userVotesDown.contains(帖子ID)及&放大器;!userVotesUp =空){
        holder.ratingDown.setImageDrawable(down_clicked);
    }其他{
        holder.ratingUp.setImageDrawable(up_unClicked);
        holder.ratingDown.setImageDrawable(down_unClicked);
    }
    db.close();    holder.ratingUp.setTag(位置);
    holder.ratingDown.setTag(位置);    holder.ratingUp.setOnClickListener(新OnClickListener(){
        @覆盖
        公共无效的onClick(查看convertView){            //使用按钮标签后获得的详细信息
            INT POS =(整数)convertView.getTag();
            后后= cityFeed.get(POS)
            字符串postid = post.getPostID();
            串ratingString = post.getRating();
            INT ratingValue =的Integer.parseInt(ratingString);
            RelativeLayout的父=(RelativeLayout的)convertView.getParent()的getParent()。
            TextView的ratingView =(TextView中)parent.findViewById(R.id.rating);
            的ImageButton起来=(的ImageButton)parent.findViewById(R.id.ratingUp);
            的ImageButton下来=(的ImageButton)parent.findViewById(R.id.ratingDown);            //如果后期不否决?
            如果(down.getDrawable()== down_unClicked){
                //如果该信息是没有投票起来......
                如果(up.getDrawable()== up_unClicked){
                    up.setImageDrawable(up_clicked);
                    ratingValue = ratingValue + 1;
                    ratingString = Integer.toString(ratingValue);
                    ratingView.setText(ratingString);
                    post.setRating(ratingString);
                    wsAsync =新WebServiceAsync(背景);
                    wsAsync.execute(voteTag,帖子ID,向上);
                //否则职位是投了...
                }其他{
                    up.setImageDrawable(up_unClicked);
                    ratingValue = ratingValue - 1;
                    ratingString = Integer.toString(ratingValue);
                    ratingView.setText(ratingString);
                    post.setRating(ratingString);
                    wsAsync =新WebServiceAsync(背景);
                    wsAsync.execute(voteTag,帖子ID,下);
                }
            //否则职位是否决...
            }其他{
                down.setImageDrawable(down_unClicked);
                up.setImageDrawable(up_clicked);
                ratingValue = ratingValue + 2;
                ratingString = Integer.toString(ratingValue);
                ratingView.setText(ratingString);
                post.setRating(ratingString);
                wsAsync =新WebServiceAsync(背景);
                wsAsync.execute(voteTag,帖子ID,upDownAlready);
            }
        }
    });    holder.ratingDown.setOnClickListener(新OnClickListener(){
        @覆盖
        公共无效的onClick(查看convertView){            //使用按钮标签后获得的详细信息
            INT POS =(整数)convertView.getTag();
            后后= cityFeed.get(POS)
            字符串postid = post.getPostID();
            串ratingString = post.getRating();
            INT ratingValue =的Integer.parseInt(ratingString);
            RelativeLayout的父=(RelativeLayout的)convertView.getParent()的getParent()。
            TextView的ratingView =(TextView中)parent.findViewById(R.id.rating);
            的ImageButton起来=(的ImageButton)parent.findViewById(R.id.ratingUp);
            的ImageButton下来=(的ImageButton)parent.findViewById(R.id.ratingDown);            //如果该信息是没有投票起来......
            如果(up.getDrawable()== up_unClicked){
                //如果后期不否决?
                如果(down.getDrawable()== down_unClicked){
                    down.setImageDrawable(down_clicked);
                    ratingValue = ratingValue - 1;
                    ratingString = Integer.toString(ratingValue);
                    ratingView.setText(ratingString);
                    post.setRating(ratingString);
                    wsAsync =新WebServiceAsync(背景);
                    wsAsync.execute(voteTag,帖子ID,下);
                //否则职位是否决...
                }其他{
                    down.setImageDrawable(down_unClicked);
                    ratingValue = ratingValue + 1;
                    ratingString = Integer.toString(ratingValue);
                    ratingView.setText(ratingString);
                    post.setRating(ratingString);
                    wsAsync =新WebServiceAsync(背景);
                    wsAsync.execute(voteTag,帖子ID,向上);
                }
            //否则职位是投了...
            }其他{
                up.setImageDrawable(up_unClicked);
                down.setImageDrawable(down_clicked);
                ratingValue = ratingValue - 2;
                ratingString = Integer.toString(ratingValue);
                ratingView.setText(ratingString);
                post.setRating(ratingString);
                wsAsync =新WebServiceAsync(背景);
                wsAsync.execute(voteTag,帖子ID,downUpAlready);
            }
        }
    });
    返回convertView;
}


解决方案

通过考虑您onClickListerners(上holder.ratingUp和holder.ratingDown)工作得很好,我认为这个问题是在code的这一部分

 如果(userVotesUp.contains(帖子ID)){
    holder.ratingUp.setImageDrawable(up_clicked);
}否则如果(userVotesDown.contains(帖子ID)及&放大器;!userVotesUp =空){
    holder.ratingDown.setImageDrawable(down_clicked);
}其他{
    holder.ratingUp.setImageDrawable(up_unClicked);
    holder.ratingDown.setImageDrawable(down_unClicked);
}

如果我没看错,你正在做的事情一样,你有3个条件,首先是

 如果(userVotesUp.contains(帖子ID))

这意味着评级upvoted,并要设置up_clicked imageDrawable,但你是不是down_unClicked图像绘制设置为holder.ratingDown。

第二个条件适用于本

 如果(userVotesUp.contains(帖子ID))

那么你down_clicked绘制设置为holder.ratingDown,但up_unClicked图像绘制不设置holder.ratingUp。

和第三个条件是既不upvoted也不downvoted这似乎是罚款。所以我觉得,你有这个替换code你的那部分。

 如果(userVotesUp.contains(帖子ID)){
    holder.ratingUp.setImageDrawable(up_clicked);
    holder.ratingDown.setImageDrawable(down_unClicked);
}否则如果(userVotesDown.contains(帖子ID)及&放大器;!userVotesUp =空){
    holder.ratingDown.setImageDrawable(down_clicked);
    holder.ratingUp.setImageDrawable(up_unClicked);
}其他{
    holder.ratingUp.setImageDrawable(up_unClicked);
    holder.ratingDown.setImageDrawable(down_unClicked);
}

希望这有助于.. !!

I'm an android beginner and I can't figure out why this is happening. Please help!

Activity Screenshot:

Everything works fine except when I scroll down (hence why I think it has to do with recycling)... So when I scroll back up and attempt to undo the vote (red arrow) on the first post... it thinks the post is voted down! Alternatively, it may also think the down-vote ImageButton drawable is empty - see code). If I don't scroll, it works perfectly.

getView code:

public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if (convertView == null) {
        holder = new ViewHolder();
        // inflate the list item
        convertView = this.inflater.inflate(R.layout.row_layout, parent, false);
        // get views
        holder.profilePic = (ImageView) convertView.findViewById(R.id.profilePic);
        holder.username = (TextView) convertView.findViewById(R.id.username);
        holder.day = (TextView) convertView.findViewById(R.id.day);
        holder.rating = (TextView) convertView.findViewById(R.id.rating);
        holder.textPost = (TextView) convertView.findViewById(R.id.textPost);
        holder.ratingUp = (ImageButton) convertView.findViewById(R.id.ratingUp);
        holder.ratingDown = (ImageButton) convertView.findViewById(R.id.ratingDown);
        convertView.setTag(holder);

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

    final Drawable up_clicked = context.getResources().getDrawable(R.drawable.ic_action_rate_up_clicked);
    final Drawable up_unClicked = context.getResources().getDrawable(R.drawable.ic_action_rate_up);
    final Drawable down_clicked = context.getResources().getDrawable(R.drawable.ic_action_rate_down_clicked);
    final Drawable down_unClicked = context.getResources().getDrawable(R.drawable.ic_action_rate_down);

    Post post = cityFeed.get(position);
    holder.profilePic.setImageResource(post.getDrawableID());
    holder.username.setText(post.getUsername());
    holder.day.setText(post.getDay());
    holder.rating.setText(post.getRating());
    holder.textPost.setText(post.getText());

    db = new DatabaseHandler(context);
    String userVotesUp = null;
    userVotesUp = db.getUserVotes("up");
    if (userVotesUp == null) {
        userVotesUp = "";
    }
    String userVotesDown = null;
    userVotesDown = db.getUserVotes("down");
    if (userVotesDown == null) {
        userVotesDown = "";
    }
    String postID = post.getPostID();
    if (userVotesUp.contains(postID)) {
        holder.ratingUp.setImageDrawable(up_clicked);
    } else if (userVotesDown.contains(postID) && userVotesUp != null) {
        holder.ratingDown.setImageDrawable(down_clicked);
    } else {
        holder.ratingUp.setImageDrawable(up_unClicked);
        holder.ratingDown.setImageDrawable(down_unClicked);
    }
    db.close();

    holder.ratingUp.setTag(position);
    holder.ratingDown.setTag(position);

    holder.ratingUp.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View convertView) {

            // get post details using button tag
            int pos = (Integer)convertView.getTag();
            Post post = cityFeed.get(pos);
            String postID = post.getPostID();
            String ratingString = post.getRating();
            int ratingValue = Integer.parseInt(ratingString);
            RelativeLayout parent = (RelativeLayout)convertView.getParent().getParent();
            TextView ratingView = (TextView)parent.findViewById(R.id.rating);
            ImageButton up = (ImageButton)parent.findViewById(R.id.ratingUp);
            ImageButton down = (ImageButton)parent.findViewById(R.id.ratingDown);

            // if the post is not voted down...
            if (down.getDrawable() == down_unClicked) {
                // if the post is not voted up...
                if (up.getDrawable() == up_unClicked) {
                    up.setImageDrawable(up_clicked);
                    ratingValue = ratingValue + 1;
                    ratingString = Integer.toString(ratingValue);
                    ratingView.setText(ratingString);
                    post.setRating(ratingString);
                    wsAsync = new WebServiceAsync(context);
                    wsAsync.execute(voteTag, postID, "up");
                // else the post is voted up...
                } else {
                    up.setImageDrawable(up_unClicked);
                    ratingValue = ratingValue - 1;
                    ratingString = Integer.toString(ratingValue);
                    ratingView.setText(ratingString);
                    post.setRating(ratingString);
                    wsAsync = new WebServiceAsync(context);
                    wsAsync.execute(voteTag, postID, "down");
                }
            // else the post is voted down...
            } else {
                down.setImageDrawable(down_unClicked);
                up.setImageDrawable(up_clicked);
                ratingValue = ratingValue + 2;
                ratingString = Integer.toString(ratingValue);
                ratingView.setText(ratingString);
                post.setRating(ratingString);
                wsAsync = new WebServiceAsync(context);
                wsAsync.execute(voteTag, postID, "upDownAlready");
            }
        }
    });

    holder.ratingDown.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View convertView) {

            // get post details using button tag
            int pos = (Integer)convertView.getTag();
            Post post = cityFeed.get(pos);
            String postID = post.getPostID();
            String ratingString = post.getRating();
            int ratingValue = Integer.parseInt(ratingString);
            RelativeLayout parent = (RelativeLayout)convertView.getParent().getParent();
            TextView ratingView = (TextView)parent.findViewById(R.id.rating);
            ImageButton up = (ImageButton)parent.findViewById(R.id.ratingUp);
            ImageButton down = (ImageButton)parent.findViewById(R.id.ratingDown);

            // if the post is not voted up...
            if (up.getDrawable() == up_unClicked) {
                // if the post is not voted down...
                if (down.getDrawable() == down_unClicked) {
                    down.setImageDrawable(down_clicked);
                    ratingValue = ratingValue - 1;
                    ratingString = Integer.toString(ratingValue);
                    ratingView.setText(ratingString);
                    post.setRating(ratingString);
                    wsAsync = new WebServiceAsync(context);
                    wsAsync.execute(voteTag, postID, "down");
                // else the post is voted down...
                } else {
                    down.setImageDrawable(down_unClicked);
                    ratingValue = ratingValue + 1;
                    ratingString = Integer.toString(ratingValue);
                    ratingView.setText(ratingString);
                    post.setRating(ratingString);
                    wsAsync = new WebServiceAsync(context);
                    wsAsync.execute(voteTag, postID, "up");
                }
            // else the post is voted up...
            } else {
                up.setImageDrawable(up_unClicked);
                down.setImageDrawable(down_clicked);
                ratingValue = ratingValue - 2;
                ratingString = Integer.toString(ratingValue);
                ratingView.setText(ratingString);
                post.setRating(ratingString);
                wsAsync = new WebServiceAsync(context);
                wsAsync.execute(voteTag, postID, "downUpAlready");
            }
        }
    });
    return convertView;
}
解决方案

By considering that your onClickListerners(on holder.ratingUp and holder.ratingDown) works fine, i think the problem is in this portion of your code

if (userVotesUp.contains(postID)) {
    holder.ratingUp.setImageDrawable(up_clicked);
} else if (userVotesDown.contains(postID) && userVotesUp != null) {
    holder.ratingDown.setImageDrawable(down_clicked);
} else {
    holder.ratingUp.setImageDrawable(up_unClicked);
    holder.ratingDown.setImageDrawable(down_unClicked);
}

If i am not wrong, you are doing something like that you have 3 conditions, First is

if (userVotesUp.contains(postID))

that means rating is upvoted and you are setting up_clicked imageDrawable, but you are not setting down_unClicked image drawable to holder.ratingDown.

second condition applies to this

if (userVotesUp.contains(postID))

then you are setting down_clicked drawable to holder.ratingDown, but not setting up_unClicked image drawable to holder.ratingUp.

and third condition is neither upvoted nor downvoted and that seems to be fine. so I think, you have to replace your that portion of code with this

if (userVotesUp.contains(postID)) {
    holder.ratingUp.setImageDrawable(up_clicked);
    holder.ratingDown.setImageDrawable(down_unClicked);
} else if (userVotesDown.contains(postID) && userVotesUp != null) {
    holder.ratingDown.setImageDrawable(down_clicked);
    holder.ratingUp.setImageDrawable(up_unClicked);
} else {
    holder.ratingUp.setImageDrawable(up_unClicked);
    holder.ratingDown.setImageDrawable(down_unClicked);
}

Hope this helps..!!

这篇关于如何停止的ListView回收?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

06-08 20:36