RecyclerView java.lang.IndexOutOfBoundsException：检测到不一致。视图支架适配器位置无效。由于更改 getItemCount()
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【中文标题】RecyclerView java.lang.IndexOutOfBoundsException：检测到不一致。视图支架适配器位置无效。由于更改 getItemCount()【英文标题】：RecyclerView java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid view holder adapter position. Due to changing getItemCount() 【发布时间】：2017-11-02 23:51:20 【问题描述】：我得到一个java.lang.IndexOutOfBoundsException: Inconsistency detected 和RecyclerView，但只有当我似乎要扔掉它时。当我滚动得足够慢时，它不会在我身上崩溃。
我将我的基本适配器用于许多其他子类，但只有某些子类会崩溃。知道为什么会这样吗？
编辑
我发现发生这种情况的原因是因为getItemCount() 会根据页脚加载视图的状态而变化。我相信这会在更改和滚动时导致不一致。
我通过始终在 getItemCount() 中为我的页眉/页脚加载视图返回 2 个额外项目来测试这一点。而不是根据它们的状态动态计算计数。解决此问题的好方法是什么？
我的适配器
public abstract class BaseRecyclerAdapter<T>
extends RecyclerView.Adapter<RecyclerView.ViewHolder>
implements LoadingAndErrorViewHolder.LoadingViewHolderListener
public static final int STATUS_HIDDEN = 0;
public static final int STATUS_LOADING = 1;
public static final int STATUS_ERROR = 2;
protected static final int TYPE_HEADER_LOADING = 0;
protected static final int TYPE_FOOTER_LOADING = 1;
protected static final int TYPE_NORMAL = 2;
private static final int POSITION_TYPE_HEADER_LOADING = 0;
private BaseRecyclerAdapterListener mBaseRecyclerAdapterListener;
private final List<T> mBackingList = new ArrayList<T>();
private int mHeaderStatus = STATUS_HIDDEN;
private int mFooterStatus = STATUS_HIDDEN;
private final int mNumOfHeaderItems;
public interface BaseRecyclerAdapterListener
void onErrorHeaderRetryClicked();
void onErrorFooterRetryClicked();
public BaseRecyclerAdapter()
this(null);
public BaseRecyclerAdapter(BaseRecyclerAdapterListener listener)
this(0, listener);
public BaseRecyclerAdapter(int numOfHeaderItems, BaseRecyclerAdapterListener listener)
mNumOfHeaderItems = numOfHeaderItems;
mBaseRecyclerAdapterListener = listener;
setHasStableIds(true);
@Override
public long getItemId(int position)
final T item = getItem(position);
if (item != null)
return item.hashCode();
else
return position;
@Override
public int getItemCount()
int count = mBackingList.size();
if (mHeaderStatus != STATUS_HIDDEN)
count++;
if (mFooterStatus != STATUS_HIDDEN)
count++;
return mNumOfHeaderItems + count;
@Override
public int getItemViewType(int position)
final int headerAdjustment = mHeaderStatus != STATUS_HIDDEN ? 1 : 0;
if (position == 0 && mHeaderStatus != STATUS_HIDDEN)
return TYPE_HEADER_LOADING;
else if (position < mBackingList.size() + headerAdjustment + mNumOfHeaderItems)
return TYPE_NORMAL;
else
return TYPE_FOOTER_LOADING;
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
switch (viewType)
case TYPE_HEADER_LOADING:
return new LoadingAndErrorViewHolder(inflater.inflate(
LoadingAndErrorViewHolder.LAYOUT_ID, parent, false),
LoadingAndErrorViewHolder.TYPE_HEADER, this);
case TYPE_FOOTER_LOADING:
return new LoadingAndErrorViewHolder(inflater.inflate(
LoadingAndErrorViewHolder.LAYOUT_ID, parent, false),
LoadingAndErrorViewHolder.TYPE_FOOTER, this);
default:
return onCreateItemViewHolder(parent, viewType);
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
final int viewType = getItemViewType(position);
switch (viewType)
case TYPE_HEADER_LOADING:
((LoadingAndErrorViewHolder) holder).setStatus(mHeaderStatus);
break;
case TYPE_FOOTER_LOADING:
((LoadingAndErrorViewHolder) holder).setStatus(mFooterStatus);
break;
default:
onBindItemViewHolder(holder, position);
@Override
public void onHeaderLoadingViewHolderClick()
if (mBaseRecyclerAdapterListener != null)
mBaseRecyclerAdapterListener.onErrorHeaderRetryClicked();
@Override
public void onFooterLoadingViewHolderClick()
if (mBaseRecyclerAdapterListener != null)
mBaseRecyclerAdapterListener.onErrorFooterRetryClicked();
public T getItem(int position)
final int headerAdjustment = mHeaderStatus != STATUS_HIDDEN ? 1 : 0;
final int adjustedPosition = position - headerAdjustment - mNumOfHeaderItems;
if (adjustedPosition < 0
|| (mFooterStatus != STATUS_HIDDEN && position == getItemCount() - 1))
return null;
else
return mBackingList.get(adjustedPosition);
public List<T> getList()
return mBackingList;
public int getListSize()
return mBackingList.size();
public void setList(List<T> list)
if (list != null)
clear();
add(list);
public void add(T item)
if (item != null)
mBackingList.add(item);
notifyItemInserted(getItemCount() - 1);
public void add(int index, T item)
if (item != null)
mBackingList.add(index, item);
notifyItemInserted(index + getItemOffset());
public void add(List<T> list)
if (list != null)
final int currentLastIndex;
if (mBackingList.size() > 0)
currentLastIndex = mBackingList.size() - 1;
else
currentLastIndex = 0;
mBackingList.addAll(list);
notifyItemRangeInserted(currentLastIndex + getItemOffset(), list.size());
public void add(int index, List<T> list)
if (list != null)
mBackingList.addAll(index, list);
notifyItemRangeInserted(index + getItemOffset(), list.size());
public void update(int position, T item)
mBackingList.set(position, item);
notifyItemChanged(position + getItemOffset());
public void remove(T item)
if (item != null && mBackingList.remove(item))
notifyDataSetChanged();
public void clear()
mBackingList.clear();
notifyDataSetChanged();
public void setHeaderStatus(int headerStatus)
mHeaderStatus = headerStatus;
notifyItemChanged(POSITION_TYPE_HEADER_LOADING);
public void setFooterStatus(int footerStatus)
mFooterStatus = footerStatus;
notifyItemChanged(getItemCount() - 1);
public void checkEndOfList(List<T> data)
if (data.isEmpty())
setFooterStatus(STATUS_HIDDEN);
else
setFooterStatus(STATUS_LOADING);
protected int getHeaderStatus()
return mHeaderStatus;
protected int getFooterStatus()
return mFooterStatus;
protected abstract RecyclerView.ViewHolder onCreateItemViewHolder(ViewGroup parent, int viewType);
protected abstract void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position);
private int getItemOffset()
final int headerAdjustment = mHeaderStatus != STATUS_HIDDEN ? 1 : 0;
return headerAdjustment + mNumOfHeaderItems;
堆栈跟踪
06-01 10:46:36.230 11448-11448/com.fusionprojects.edmodo E/androidRuntime: FATAL EXCEPTION: main
Process: com.fusionprojects.edmodo, PID: 11448
java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid view holder adapter positionViewHolderdcf5c3a position=23 id=-1, oldPos=23, pLpos:-1 scrap [attachedScrap] tmpDetached no parent
at android.support.v7.widget.RecyclerView$Recycler.validateViewHolderForOffsetPosition(RecyclerView.java:5297)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5479)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5440)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5436)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2224)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1551)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1511)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:595)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep1(RecyclerView.java:3534)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3310)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3844)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:636)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1795)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
06-01 10:46:36.231 11448-11448/com.fusionprojects.edmodo E/AndroidRuntime: at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:726)
at android.view.View.layout(View.java:17641)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2346)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2068)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6343)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
at android.view.Choreographer.doCallbacks(Choreographer.java:686)
at android.view.Choreographer.doFrame(Choreographer.java:621)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6126)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
【问题讨论】：
RecyclerView: Inconsistency detected. Invalid item position的可能重复 【参考方案1】：我通过在我的setFooterStatus() 方法中调用notifyDataSetChanged() 解决了这个问题。
【讨论】：
以上是关于RecyclerView java.lang.IndexOutOfBoundsException：检测到不一致。视图支架适配器位置无效。由于更改 getItemCount()的主要内容，如果未能解决你的问题，请参考以下文章
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