Question

我有以下代码：

for (child in children)
{
   items.add(book)
   viewAdapter.notifyItemInserted(items.count()-1)
}

这是我得到的错误：

E / Android运行时：致命异常：主要流程：edu.uoc.android.pac2，PID：6949 java.lang.IndexOutOfBoundsException：检测到不一致。无效的视图支架适配器positionViewHolder {c7d5aa8 position = 10 id = -1，oldPos = 1，pLpos：1个废料[attachedScrap] tmpDetached没有父级} android.support.v7.widget.RecyclerView {a74a62 VFED ..... 0,0-1080,1536＃7f08002b app：id / book_recycler_view}，适配器：edu.uoc.android.pac2.SimpleItemRecyclerViewAdapter@9b0b7f3，布局：android.support.v7.widget.StaggeredGridLayoutManager@13c8cb0，上下文：edu.uoc.android.pac2.BookListActivity@23f070d 在android.support.v7.widget.RecyclerView $ Recycler.validateViewHolderForOffsetPosition（RecyclerView.java:5715）在android.support.v7.widget.RecyclerView $ Recycler.tryGetViewHolderForPositionByDeadline（RecyclerView.java:5898）在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:5858）在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:5854）在android.support.v7.widget.LayoutState.next（LayoutState.java:100）在android.support.v7.widget.StaggeredGridLayoutManager.fill（StaggeredGridLayoutManager.java:1609）在android.support.v7.widget.StaggeredGridLayoutManager.onLayoutChildren（StaggeredGridLayoutManager.java:683）在android.support.v7.widget.StaggeredGridLayoutManager.onLayoutChildren（StaggeredGridLayoutManager.java:605）在android.support.v7.widget.RecyclerView.dispatchLayoutStep1（RecyclerView.java:3875）在android.support.v7.widget.RecyclerView.dispatchLayout（RecyclerView.java:3639）在android.support.v7.widget.RecyclerView.onLayout（RecyclerView.java:4194）在android.view.View.layout（View.java:20672）在android.view.ViewGroup.layout（ViewGroup.java:6194）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:323）在android.widget.FrameLayout.onLayout（FrameLayout.java:261）在android.view.View.layout（View.java:20672）在android.view.ViewGroup.layout（ViewGroup.java:6194）在android.support.v4.widget.SwipeRefreshLayout.onLayout（SwipeRefreshLayout.java:625）在android.view.View.layout（View.java:20672）在android.view.ViewGroup.layout（ViewGroup.java:6194）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:323）在android.widget.FrameLayout.onLayout（FrameLayout.java:261）在android.view.View.layout（View.java:20672）在android.view.ViewGroup.layout（ViewGroup.java:6194）在android.support.v7.widget.ActionBarOverlayLayout.onLayout（ActionBarOverlayLayout.java:444）在android.view.View.layout（View.java:20672）在android.view.ViewGroup.layout（ViewGroup.java:6194）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:323）在android.widget.FrameLayout.onLayout（FrameLayout.java:261）在android.view.View.layout（View.java:20672）在android.view.ViewGroup.layout（ViewGroup.java:6194）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1812）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1656）在android.widget.LinearLayout.onLayout（LinearLayout.java:1565）在android.view.View.layout（View.java:20672）在android.view.ViewGroup.layout（ViewGroup.java:6194）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:323）在android.widget.FrameLayout.onLayout（FrameLayout.java:261）在com.android.internal.policy.DecorView.onLayout（DecorView.java:753）在android.view.View.layout（View.java:20672）在android.view.ViewGroup.layout（ViewGroup.java:6194）在android.view.ViewRootImpl.performLayout（ViewRootImpl.java:2792）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:2319）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1460）在android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:7183）在android.view.Choreographer $ CallbackRecord.run（Choreographer.java:949）在android.view.Choreographer.doCallbacks（Choreographer.java:761）在android.view.Choreographer.doFrame（Choreographer.java:696）在android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:935）在android.os.Handler.handleCallback（Handler.java:873）在android.os.Handler.dispatchMessage（Handler.java:99）在android.os.Looper.loop（Looper.java:193）在android.app.ActivityThread.main（ActivityThread.java:6669）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:493）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:858）

仅当我添加项目时，以下代码才有效：

items.clear()
viewAdapter.notifyItemRangeRemoved(0, size)

也是这样：

val position = items.indexOf(elem)
items.remove(elem)
viewAdapter.notifyItemRemoved(position)

我缺少什么？

Answer 1

for (child in children)
{
  items.add(book)
}
viewAdapter.notifyItemInserted(items.count()-1)

请保持notifyItemInserted在循环之外并进行检查。

通知适配器上的RecyclerView不一致

1 个答案: