如何停止的ListView回收？ [英] How to stop ListView recycling?
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..!!
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