如何获取Recyclerview的特定项目的ViewHolder [英] How to get ViewHolder of specific Item of Recyclerview

问题描述

有没有办法仅基于给定位置获取recyclerview的特定项目的ViewHolder?

Is there a way to get the ViewHolder of specific Item of recyclerview base on given position only?

类似于getViewHolder(position);.

public MyViewHolder getViewHolder(int position){
    MyViewHolder holder = null;
    /**
        Find ViewHolder here...
            If Found initialize the holder..
                holder = ?
    **/
    return holder;
}

此函数在我的Adapter类中，我正在寻找一种获取项目ViewHolder的方法，以便可以更改自定义项目eg. holder.setText("Hello World");的某个视图的值，我有库存，我找不到解决方法，我尝试搜索，但没有一个能帮助我.

This function is in my Adapter class, I'm looking for a way to get the ViewHolder of an Item so I can change the value of one of my view of my custom item eg. holder.setText("Hello World");, I'm stock, I can't find a way to do that, I tried to search but none of them help me.

有人吗?

推荐答案

这不是ViewHolder的工作原理. ViewHolder只是您制作的版式的所有者. ViewHolder是可自动重用的，因此，如果您有100个项目，则android不会创建100个ViewHolders，而不会创建一些在屏幕上可见的ViewHolders.如果滚动RecyclerView，则不可见项的ViewHolder将被重新使用.您只需要更改在方法onBindViewHolder

That is not how ViewHolder works. ViewHolder is just a holder of layout that you made. ViewHolder is automatically re-use-able, so if you have 100 items, android will not create 100 ViewHolders, instead of just some ViewHolders that visible on the screen. If you scroll the RecyclerView, the ViewHolder of non-visible item will be re-used. You just need to change the data on the ViewHolder that passed automatically on method onBindViewHolder

这里是例子

@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
    holder.textViewTitle.setText(data.get(position).title);
    holder.textViewContent.setText(data.get(position).content);

    Context context = holder.button.getContext();    
    holder.button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(context, "you clicked the button!", Toast.LENGTH_SHORT).show();
        }
    });
}

为了更加清楚，您应该做的是更改适配器中的特定数据，例如，您可以像这样在适配器中创建一个方法

To make it more clear, what you should do is change the specific data from your adapter, for example you can create a method in your adapter like this

public void changeItem(int position, ItemModel newItemModel){
    mItemModelList.remove(position);
    mItemModelList.add(position, newItemModel);
}

然后调用适配器的notifyItemChanged(int position).

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