Question

我列出了以下型号：

name
categoryName

现在，我已经建立了一个Recyclerview，它将具有相同categoryName的所有实体分组：

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）。该名单已订购。我不需要代码，但是，适用于适配器的算法是什么？我能用一个周期来解决这个问题吗？

我希望避免从代码中向垂直LinearLayout添加视图。

Answer 1

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 ...
}

在您的适配器中，您应该执行以下操作：

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;
      }
}

不要忘记创建视图持有者。

编辑1：为适配器添加了数据结构

Answer 2

您必须覆盖RecyclerView的方法public int getItemViewType(int position)，并在public void onCreateViewHolder(ViewGroup parent, int viewType)

中处理它

示例：

enum Type{Name,Category}

@Override
public int getItemViewType(int position) {
   if (position == POSITION_CATEGORY_1 || position == POSITION_CATEGORY_2) {
      return Type.Category;
   } else {
      return Type.Name;}
   }
}

结束绑定：

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if(viewType == Type.Category.ordinal()){
        return new CategoryItemView(...);
    }else {
        return new CommonItemView(...);
    }
}

RecyclerView多视图类型

2 个答案: