如何从另一个项目更新recyclerview项目中的数据? [英] how to update data in recyclerview item from another item?

问题描述

我在RecyclerView上遇到问题，我在RecyclerView中有一个radio button，并且每个行项目中都有其他几个视图，

I have a problem with RecyclerView, I have RecyclerView which has a radio button and few other views in each row item,

我真正想要的是，当用户选中了RadioButton时，我想取消选中其他RadioButton(如果之前进行了检查).由于它是Recyclerview，因此我无法使用广播组.

What I wanted exactly is, when a RadioButton is checked by user I want to uncheck other RadioButton(if anything is checked earlier). Since it is a Recyclerview I cannot use radiogroup.

在适配器onBindViewHolder中，我为每个单选按钮编写此侦听器

In the adapter onBindViewHolder I write this listener for each radio button

  holder.radioButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            selectedPosition = holder.getAdapterPosition();
            Toast.makeText(activity, "section: " + selectedPosition, Toast.LENGTH_SHORT).show();
        }
    });

如何取消选中以前的单选按钮?
换句话说，如何从另一个项目视图侦听器更新recyclerview特定项目中的视图属性?

how can i make previous radio button selected uncheck?
in other words, how can i update view property in specific item of recyclerview from another item view listener?

推荐答案

您需要全局引用适配器中的selectedItem，然后在用户检查新的单选按钮时更新所有项目.

You need to have a reference to the selectedItem globally in your adapter and then update all the items when the user checks a new radio button.

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
    private int selectedItemPosition = -1;
}

然后在适配器的onBindViewHolder()方法中进行操作

And do things in your onBindViewHolder() method of the adapter,

@Override
public void onBindViewHolder(final Adapter.ViewHolder holder, int position) {
    holder.radioButton.setChecked(holder.getAdapterPosition()==selectedItemPosition);
    holder.radioButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            selectedItemPosition = holder.getAdapterPosition();
            notifyDataSetChanged();
        }
    });
}

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