问题描述
在我的适配器中,我调用LayoutManager.ChildAt(position)
来获取itemview
,但是我得到的视图不是匹配的itemview
,并且当我调用notifyItemChanged(position)
时,应用程序崩溃了:
In my Adapter, I call LayoutManager.ChildAt(position)
to get the itemview
, but the view I get is not the matched itemview
, and when i call notifyItemChanged(position)
, app crashes:
E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.paicaifu.riches, PID: 8502
Java.lang.IllegalArgumentException: Called attach on a child which is not detached: ViewHolder{adb21588 position=0 id=-1, oldPos=-1, pLpos:-1}
at Android.support.v7.widget.RecyclerView$5.attachViewToParent(RecyclerView.java:654)
at android.support.v7.widget.ChildHelper.attachViewToParent(ChildHelper.java:239)
at android.support.v7.widget.RecyclerView.addAnimatingView(RecyclerView.java:1107)
at android.support.v7.widget.RecyclerView.animateChange(RecyclerView.java:3270)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep3(RecyclerView.java:3088)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2917)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3283)
…
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
谢谢,这是我在适配器中的代码:
Thanks,this is my code in the adapter:
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder,
final int position) {
if (holder instanceof CardHolder) {
final CardHolder cardHolder = (CardHolder) holder;
cardHolder.rootview.setOnClickListener(this);
cardHolder.rootview.setTag(position);
cardHolder.rootview.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//get last itemview in adapter,but preView isnot match the
//position,it is the visibable views on screen
View preView = mLinearLayoutManager.getChildAt(preIndex);
//change the datasource
mData.getResult().getCardList().get(preIndex).setOpen(false);
//update item
notifyItemChanged(preIndex);//when the item is out of screen,
//this line will cause crashes
preIndex = position;
}
});
}
我只想找到最后一个项目并更改其状态(打开或关闭),当该项目不在屏幕上时,notifyItemChanged(int位置)会出现问题.
I just want find the last item and change it's state(open or close),when the item is out of screen,notifyItemChanged(int position) will appear problem.
推荐答案
这可能为时已晚,但是当您未在其中创建新视图时,通常会发生崩溃称为未分离的子项上的附加" onCreateViewHolder
,而是返回已膨胀并已附加的缓存视图.
This is probably a bit too late, but the crash "Called attach on a child which is not detached" typically happens when you do NOT create a new view in onCreateViewHolder
and instead return a cached view that's already inflated and attached.
这篇关于RecyclerView.Adapter通过位置获取ItemView的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!