我有以下模型的列表:
name
categoryName
现在,我必须构建一个 recyclerview,它将所有具有相同类别名称的实体分组:
categoryName1
name1
name2
name3
categoryName2
name4
categoryName3
name5
name6
所以我有两种不同的行类型(不同的样式)。列表是有序的。我不一定需要代码,但是,适配器使用的算法是什么?我可以只用一个周期解决这个问题吗?
我想避免从代码中向垂直 LinearLayout 添加 View 。
最佳答案
您的数据应如下所示:
public class CategorizedName {
private Category category;
private Collection<Name> names = null;
public Category getCategory() {
return category;
}
public Collection<Name> getNames() {
return names;
}
// override hashCode and equals ...
}
在你的适配器中你应该做这样的事情:
private static final int CATEGORY = 1;
private static final int NAME = 2;
private Collection<CategorizedName> data;
@Override
public int getItemViewType(int position) {
if (items.get(position) instanceof Category) {
return CATEGORY;
} else if (items.get(position) instanceof Name) {
return NAME;
}
throw new RuntimeException('error');
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
RecyclerView.ViewHolder viewHolder;
LayoutInflater inflater = LayoutInflater.from(viewGroup.getContext());
switch (viewType) {
case CATEGORY:
View categoryView = inflater.inflate(R.layout.viewholder_category, viewGroup, false);
viewHolder = new CategoryViewHolder(categoryView);
break;
case NAME:
View nameView = inflater.inflate(R.layout.viewholder_name, viewGroup, false);
viewHolder = new NameViewHolder(nameView);
break;
}
return viewHolder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
switch (viewHolder.getItemViewType()) {
case USER:
CategoryViewHolder categoryViewHolder = (CategoryViewHolder) viewHolder;
bindCategoryViewHolder(categoryViewHolder, position);
break;
case IMAGE:
NameViewHolder nameViewHolder = (NameViewHolder) viewHolder;
bindNameViewHolder(nameViewHolder, position);
break;
}
}
不要忘记创建 View 持有者。
编辑 1:为适配器添加数据结构
关于android - RecyclerView 多 View 类型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47331923/