如何遍历RecyclerView中的所有视图/项目? [英] How do iterate through all the views/items in a RecyclerView?

问题描述

我需要遍历RecyclerView中的所有RadioGroups.

我尝试的代码:

for(int i=0;i<recyclerView.getAdapter().getItemCount();i++)
  {
     radioGroup = recyclerView.findViewHolderForAdapterPosition(i).itemView.findViewById(R.id.radio_group);
  }

但是findViewHolderForAdapterPosition(i)对于不在屏幕上的RadioGroup返回null并给我一个NullPointerException.

but findViewHolderForAdapterPosition(i) returns null for RadioGroups that are off screen and gives me a NullPointerException.

我如何遍历所有这些人?

How do i iterate through all of them?

推荐答案

RecyclerView视图在滚动时根据需要创建/销毁.您不能依靠它们的可用性.

RecyclerView views are created/destroyed as needed when you scroll. You cannot rely on them being available.

我假设您正在尝试检索选择状态.最好将其存储在适配器中的对象中，并在单击单选按钮时更新其值.

I assume you are trying to retrieve the selection state. It is better to store this within your object in the adapter and update its value upon clicking a radio button.

然后，您可以在适配器中实现getItem方法，该方法返回对象及其当前选择状态.

Then you can implement a getItem method in your adapter that returns the object and it's current selection state.

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