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android - 在第一个 viewType 上收到 DiffUtil 有效负载数据，但我需要第二个 Viewtype

问题描述

我在带有 DiffUtil 的 RecyclerView 适配器自定义类中使用了两个 viewType。

在那我更新数据它将更新 Diffutil getChangePayload但它会更新第一个视图类型。

如何将有效负载数据更改为TYPE_ITEM viewType？

> **CustomViewAdapter class**

  private static final int TYPE_HEADER = 0;
  private static final int TYPE_ITEM = 1;

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            if (viewType == TYPE_ITEM) {
                View itemView = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.home_list_items, parent, false);
                return new MyViewHolder(itemView);
            } else if (viewType == TYPE_HEADER) {
                View itemView = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.home_banner, parent, false);
                return new HeaderView(itemView);
            }
            return null;
        }



    @Override
            public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int position, @NonNull List<Object> payloads) { 
            Log.d(TAG, "onBindViewHolder: viewholder " + viewHolder);
            Log.d(TAG, "onBindViewHolder: payload " + payloads);
}

标签： androidandroid-recyclerviewandroid-diffutils

解决方案

For your specific case where you have 2 types of items listed below each other (not mixed), I recommend to use the ConcatAdapter from the RecyclerView package:

https://developer.android.com/reference/androidx/recyclerview/widget/ConcatAdapter

It allows you to connect 2 normal ViewAdapters - for each type one separate adapter. This keeps your codebase a lot cleaner and maintainable.

This is a short example how to use it:

 MyAdapter adapter1 = ...;
 AnotherAdapter adapter2 = ...;
 ConcatAdapter concatenated = new ConcatAdapter(adapter1, adapter2);
 recyclerView.setAdapter(concatenated);

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