自定义ArrayAdapter< Object> ViewHolder：imageView中的几个项目的更改不仅仅是一个 [英] custom ArrayAdapter<Object> ViewHolder : imageView changes for several items in Listview not for one only
问题描述
好吧我遇到这个自定义ArrayAdapter的问题
ok i encounter a problem with this custom ArrayAdapter
public class AuthorsAdapter extends ArrayAdapter<Entity> {
View row;
static class ViewHolder {
TextView textViewTitle;
TextView textViewEntitySummary;
ImageView imageViewPicture;
}
public AuthorsAdapter(Context context, LinkedList<Entity> entity) {
super(context, 0, entity);
}
@Override
public View getView( final int position, View convertView, final ViewGroup parent) {
row = convertView;
final ViewHolder holder;
if (row == null) {
row = LayoutInflater.from(getContext()).inflate(R.layout.listview_search_author_template, parent, false);
holder = new ViewHolder();
holder.textViewTitle = (TextView) row.findViewById(R.id.textView_TitleTopLeft);
holder.textViewEntitySummary = (TextView) row.findViewById(R.id.textView_EntitySummary);
holder.imageViewPicture = (ImageView) row.findViewById(R.id.imageView_author);
row.setTag(holder);
} else
holder = (ViewHolder) row.getTag();
holder.textViewTitle.setText(getItem(position).getTitle());
if (!getItem(position).getPictureURL().isEmpty())
Picasso.with(getContext()).load(getItem(position).getPictureURL()).into(holder.imageViewPicture);
holder.textViewEntitySummary.setText(getItem(position).getBiography());
holder.imageViewPicture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!getItem(position).isImageResized()) {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
getItem(position).setIsImageResized(true);
} else if (getItem(position).isImageResized()) {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT));
getItem(position).setIsImageResized(false);
} else {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT));
}
}
});
return row;
}
一切运作良好，期待imageView onclicklistener：
everything works well expected the imageView onclicklistener :
holder.imageViewPicture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!getItem(position).isImageResized()) {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
getItem(position).setIsImageResized(true);
} else if (getItem(position).isImageResized()) {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT));
getItem(position).setIsImageResized(false);
} else {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT));
}
}
});
}
我希望图像改变它的大小点击它，它工作，但当我在我的视图中向下滚动时，我的listView中的随机其他项目受到点击第一项的影响...当我进入我的列表视图时，图像不再调整大小（在我点击的索引处） ）任何提示使这个工作完美无缺？
i want that the image change it size on click, it work but when i scroll down in my view, random other items in my listView get affected by clicking on first item... and when i come up in my listview the image is not resized anymore (at index where i clicked) any hints to make this working flawlessly?
推荐答案
好的我通过引用
private LinkedList<Entity> entity;
public AuthorsAdapter(Context context, LinkedList<Entity> entity) {
super(context, 0, entity);
this.entity = entity;
}
在构造函数
然后而不是像你说的那样：
in the constructor then instead of doing like you said :
.... else{
holder = (ViewHolder) convertView.getTag();
}
if (!getItem(position).isImageResized()) {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
getItem(position).setIsImageResized(true);
} else if (getItem(position).isImageResized()) {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT));
getItem(position).setIsImageResized(false);
} else {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT));
} .....
我做了一个增强的for循环这个：
ive made an enhanced for loop like this :
.... else{
holder = (ViewHolder) convertView.getTag();
}
for (Entity foo : entity) {
if (!foo.isImageResized()) {
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
25,
25));
} else if (foo.isImageResized())
holder.imageViewPicture.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT));
} ....
请注意我在我做了一些更改xml布局所以现在图像是正确的在标题:)下我让它匹配父级以获得更大尺寸的图像...
note that i do some changes in my xml layout so now the image is right Under the title :) and i make it match parent to have bigger sized image...
btw非常感谢提示@ Ammar aly它真的帮了我
btw thanks a lot for the hint @Ammar aly it really helped me
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