在我的应用程序中,我使用RecyclerView.Adapter
和我的自定义Holder
类。每个项目包含少量TextView
和一个ImageView
(图标)。问题是RecyclerView
在快速滚动后显示错误的图像。
示例:
所以,我的持有人是:
public class CafeHolder extends RecyclerView.ViewHolder implements OnClickListener {
TextView itemName, itemType, itemMarksCount, itemCommentsCount, itemRating;
ImageView imgCafe;
ImageLoader imgLoader;
private Context context;
private int cafeId;
public CafeHolder(View view, Context context){
super(view);
this.context = context;
itemName = (TextView) view.findViewById(R.id.tvCafeName);
imgCafe = (ImageView) view.findViewById(R.id.imgCafe);
itemType = (TextView) view.findViewById(R.id.tvCafeType);
itemMarksCount = (TextView) view.findViewById(R.id.tvMarksCount);
itemCommentsCount = (TextView) view.findViewById(R.id.tvCommentsCount);
itemRating = (TextView) view.findViewById(R.id.tvRatingCount);
imgLoader = new ImageLoader(context);
view.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Intent intent = new Intent(context, InfoActivity.class);
intent.putExtra(CafeDomain.ID, cafeId);
context.startActivity(intent);
}
public void setCafeId(int cafeId){
this.cafeId = cafeId;
}
我的RecyclerView.Adapter:
public class CafeAdapter extends RecyclerView.Adapter<CafeHolder> {
private Context context;
List<CafeDomain> listItems;
public CafeAdapter(List<CafeDomain> listItems, Context context) {
this.listItems = listItems;
this.context = context;
}
@Override
public CafeHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_cafe_item2, parent, false);
CafeHolder vh = new CafeHolder(v, context);
return vh;
}
@Override
public void onBindViewHolder(CafeHolder holder, int position) {
CafeDomain dItem = this.listItems.get(position);
holder.imgCafe.setImageDrawable(null);
holder.itemName.setText(dItem.getName());
ArrayList<TypeDomain> types = dItem.getTypes();
StringBuilder sbTypes = new StringBuilder();
for (int i = 0; i < types.size(); i++){
sbTypes.append(types.get(i).getName());
if (i!=types.size()-1)
sbTypes.append(", ");
}
holder.itemType.setText(sbTypes.toString());
if (!dItem.getIconUrl().isEmpty()){
holder.imgLoader.DisplayImage(dItem.getIconUrl(), holder.imgCafe); //load image from cache or web
}
else{
holder.imgCafe.setImageResource(R.drawable.icon200); //set default image
}
holder.itemMarksCount.setText(String.valueOf(dItem.getMarksCount()));
holder.itemCommentsCount.setText(String.valueOf(dItem.getCommentsCount()));
holder.itemRating.setText(String.valueOf(dItem.getRating()));
holder.setCafeId(listItems.get(position).getId());
}
@Override
public int getItemCount() {
return listItems.size();
}
}
我可以看到,这段代码:
else{
holder.imgCafe.setImageResource(R.drawable.icon200); //set default image
}
正在运作,但无论如何两张图片都是错误的:(
更新: 问题是只有在磁盘中没有图像缓存的情况下快速滚动列表时。当我们有缓存时,这里没有问题......
答案 0 :(得分:4)
嗨,我认为你的问题在这里:
<rewrite>
<rules>
<rule name="Redirect to non-www" topProcessing="true">
<match url="(.*)" negate="false"></match>
<action type="Redirect" url="http://domain.com/{R:1}"></action>
<conditions>
<add input="{HTTP_HOST}" pattern="^domain\.com$" negate="true"></add>
</conditions>
</rule>
</rules>
</rewrite>
我可以为您提供两种可行的解决方案。首先使用 if (!dItem.getIconUrl().isEmpty()){
holder.imgLoader.DisplayImage(dItem.getIconUrl(), holder.imgCafe); //load image from cache or web
}
else{
holder.imgCafe.setImageResource(R.drawable.icon200); //set default image
}
TextUtils.isEmpty()
如果这不起作用,如果您可以为 if (!TextUtils.isEmpty(dItem.getIconUrl())){
holder.imgLoader.DisplayImage(dItem.getIconUrl(), holder.imgCafe);
}
else{
holder.imgCafe.setImageResource(R.drawable.icon200); //set default image
}
或empty url
设置可绘制的图片,只需将其留给您的图片下载器,然后使用下面的代码:
url loading fail