具有多种动态类型视图的 Recyclerview

Question

我对@9​​87654323@的项目类型是动态的有疑问。这意味着我不知道Recyclerview的项目有多少种类型。所以我不知道如何写onCreateViewHolder()在MyAdapter extends RecyclerView.Adpter<RecylerView.ViewHolder>.

但事实上，物品遵循一些规律。例如：

项目1：

Text(title)
Pic(Vertical) Pic(Vertical) Pic(Vertical)
Pic(Vertical) Pic(Vertical) Pic(Vertical)

项目2：

Text(title)
Pic(Horizontal) Pic(Horizontal)
Pic(Horizontal) Pic(Horizontal)

如果图片是垂直的，则列是三。如果图片是水平的，则列是二。图片的数量可能是一，二，三，四，五，六等等，所以我的类型无法确认。 对不起，我不能显示图片。我有一个问题RecyclerView with GridView

但这并不能解决我的问题。我看到了How to create RecyclerView with multiple view type?

但是类型没有改变。 PS：我从数据中知道图片是垂直的还是水平的。

Answer 1

您不能创建两个自定义 ViewHolder 并检查哪个正在传递给 onCreateviewHolder，如本答案所示？ How to create RecyclerView with multiple view type?

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

class ViewHolder0 extends RecyclerView.ViewHolder {
   //viewHolder for horitzontal pics
    ...
}

class ViewHolder2 extends RecyclerView.ViewHolder {
    ...
    //viewHolder for vertical pics
}

@Override
public int getItemViewType(int position) {
    // Just as an example, return 0 or 2 depending on position
    // Note that unlike in ListView adapters, types don't have to be contiguous
    return position % 2 * 2;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
     switch (viewType) {
         case 0: return new ViewHolder0(...);
         case 2: return new ViewHolder2(...);
         ...
     }
}

}

在docs 你可以扩展 RecyclerView.ViewHolder

// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class ViewHolder extends RecyclerView.ViewHolder {
    // each data item is just a string in this case
    public TextView mTextView;
    public ViewHolder(TextView v) {
        super(v);
        mTextView = v;
    }
}