我们的QA发现了一个错误：发生了以下与RecyclerView相关的崩溃：
java.lang.IndexOutOfBoundsException: 检测到不一致。无效的物品位置2（偏移量：2）。状态：3
一种粗暴的解决方法可能是在发生异常时捕获它并从头开始重新创建RecyclverView实例，以避免留下损坏的状态。
但是，如果可能的话，我想更好地理解问题（并可能在源头上修复它），而不是掩盖它。
这个bug很容易复现，当滚动速度很快时就会崩溃，但一旦发生就是致命的。
我的工作代码是：
public class MoviesGridRecyclerViewDataAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public static final int VIEW_ITEM = 1;
public static final int VIEW_PROG = -1;
private static final int FADE_DURATION = 500;
int pastVisiblesItems, visibleItemCount, totalItemCount;
private List<VideoEntity> dataList;
private FragmentActivity activity;
private int visibleThreshold = 1;
//private int lastVisibleItem, totalItemCount;
//private boolean loading = false;
private OnLoadMoreListener onLoadMoreListener;
private RecyclerView.OnScrollListener recyclerciewScrollListener;
private RecyclerView recyclerView;
private boolean followLargeItemOnDataRender;
private boolean loading = false;
private boolean isLiveChannel = false;
public MoviesGridRecyclerViewDataAdapter(FragmentActivity fragmentActivity, final List<VideoEntity> dataList, RecyclerView recycler, boolean followLargeItemOnOddData, boolean isLiveChannels) {
this.dataList = dataList;
this.activity = fragmentActivity;
this.followLargeItemOnDataRender = followLargeItemOnOddData;
this.recyclerView = recycler;
isLiveChannel = isLiveChannels;
Log.e("VideoGridRVDataAdapter", "True");
if (this.recyclerView.getLayoutManager() instanceof GridLayoutManager) {
final GridLayoutManager gridLayoutManager = (GridLayoutManager) this.recyclerView.getLayoutManager();
recyclerciewScrollListener = new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (dy > 0) //check for scroll down
{
visibleItemCount = gridLayoutManager.getChildCount();
totalItemCount = gridLayoutManager.getItemCount();
pastVisiblesItems = gridLayoutManager.findFirstVisibleItemPosition();
if (!loading) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loading = true;
if (onLoadMoreListener != null) {
onLoadMoreListener.onLoadMore(visibleItemCount + pastVisiblesItems);
}
}
}
}
}
};
this.recyclerView.addOnScrollListener(recyclerciewScrollListener);
}
}
public void notifyDataLoadingStartProgress() {
dataList.add(null);
notifyItemInserted(dataList.size() - 1);
}
public void notifyDataLoaded() {
dataList.remove(dataList.size() - 1);
notifyItemRemoved(dataList.size());
setLoaded();
}
public void resetItems(@NonNull List<VideoEntity> newDataSet) {
loading = false;
pastVisiblesItems = visibleItemCount = totalItemCount = 0;
dataList.clear();
addItems(newDataSet);
}
public void addItems(@NonNull List<VideoEntity> newDataSetItems) {
dataList.addAll(newDataSetItems);
postAndNotifyAdapter(new Handler());
}
public void addItem(VideoEntity item) {
if (!dataList.contains(item)) {
dataList.add(item);
notifyItemInserted(dataList.size() - 1);
}
}
public void removeItem(VideoEntity item) {
int indexOfItem = dataList.indexOf(item);
if (indexOfItem != -1) {
this.dataList.remove(indexOfItem);
notifyItemRemoved(indexOfItem);
}
}
private void postAndNotifyAdapter(final Handler handler) {
handler.post(new Runnable() {
@Override
public void run() {
if (!recyclerView.isComputingLayout()) {
try {
recyclerView.getRecycledViewPool().clear();
notifyDataSetChanged();
} catch (IndexOutOfBoundsException ex) {
}
} else {
postAndNotifyAdapter(handler);
}
}
});
}
public void destroy() {
this.recyclerView.removeOnScrollListener(recyclerciewScrollListener);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
RecyclerView.ViewHolder vh;
View v;
if (viewType == VIEW_PROG) {
v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_progressbar, viewGroup, false);
vh = new ProgressViewHolder(v);
} else {
Integer layoutResourceId;
if (isLiveChannel) {
layoutResourceId = R.layout.item_video_grid_norma_hs_overfow_overdraw;
} else {
layoutResourceId = R.layout.item_video_linear_overdraw;
}
v = LayoutInflater.from(viewGroup.getContext()).inflate(layoutResourceId, viewGroup, false);
vh = new MoviesItemRowHolder(this, dataList, v, activity);
}
return vh;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int i) {
if (holder instanceof MoviesItemRowHolder) {
VideoEntity singleItem = dataList.get(i);
((MoviesItemRowHolder) holder).bind(singleItem,dataList);
//setScaleAnimation(holder.itemView);
} else {
((ProgressViewHolder) holder).progressBar.setIndeterminate(true);
}
}
public boolean isLoading() {
return loading;
}
public void setLoaded() {
loading = false;
}
private void setFadeAnimation(View view) {
AlphaAnimation anim = new AlphaAnimation(0.0f, 1.0f);
anim.setDuration(FADE_DURATION);
view.startAnimation(anim);
}
private void setScaleAnimation(View view) {
ScaleAnimation anim = new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
anim.setDuration(FADE_DURATION);
view.startAnimation(anim);
}
/**
* Return the view type of the item at <code>position</code> for the purposes
* of view recycling.
* <p/>
* <p>The default implementation of this method returns 0, making the assumption of
* a single view type for the adapter. Unlike ListView adapters, types need not
* be contiguous. Consider using id resources to uniquely identify item view types.
*
* @param position position to query
* @return integer value identifying the type of the view needed to represent the item at
* <code>position</code>. Type codes need not be contiguous.
*/
@Override
public int getItemViewType(int position) {
//return position;
return dataList.get(position) != null ? position : VIEW_PROG;
}
@Override
public int getItemCount() {
return (null != dataList ? dataList.size() : 0);
}
public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
this.onLoadMoreListener = onLoadMoreListener;
}
public List<VideoEntity> getItems() {
return dataList;
}
}
请看一下我的类，并告诉我出了什么问题，当我快速滚动时，在少数设备上会崩溃。
以下是堆栈跟踪：
Fatal Exception: java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 17(offset:17).state:18 android.support.v7.widget.RecyclerView{4266ee78 VFED.... .F....ID 0,0-480,625 #7f0902db app:id/recycler_view_list}, adapter:com.tapmad.tapmadtv.f.e@425896c0, layout:com.tapmad.tapmadtv.WrapContentLinearLayoutManager@424092b0, context:com.tapmad.tapmadtv.activities.SectionMoreActivityHS@4244c478
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline + 5923(RecyclerView.java:5923)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition + 5858(RecyclerView.java:5858)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition + 5854(RecyclerView.java:5854)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next + 2230(LinearLayoutManager.java:2230)
at android.support.v7.widget.GridLayoutManager.layoutChunk + 557(GridLayoutManager.java:557)
at android.support.v7.widget.LinearLayoutManager.fill + 1517(LinearLayoutManager.java:1517)
at android.support.v7.widget.LinearLayoutManager.scrollBy + 1331(LinearLayoutManager.java:1331)
at android.support.v7.widget.LinearLayoutManager.scrollVerticallyBy + 1075(LinearLayoutManager.java:1075)
at android.support.v7.widget.GridLayoutManager.scrollVerticallyBy + 382(GridLayoutManager.java:382)
at android.support.v7.widget.RecyclerView.scrollStep + 1832(RecyclerView.java:1832)
at android.support.v7.widget.RecyclerView$ViewFlinger.run + 5067(RecyclerView.java:5067)
at android.view.Choreographer$CallbackRecord.run + 791(Choreographer.java:791)
at android.view.Choreographer.doCallbacks + 591(Choreographer.java:591)
at android.view.Choreographer.doFrame + 560(Choreographer.java:560)
at android.view.Choreographer$FrameDisplayEventReceiver.run + 777(Choreographer.java:777)
at android.os.Handler.handleCallback + 725(Handler.java:725)
at android.os.Handler.dispatchMessage + 92(Handler.java:92)
at android.os.Looper.loop + 176(Looper.java:176)
at android.app.ActivityThread.main + 5317(ActivityThread.java:5317)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke + 511(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run + 1102(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main + 869(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(NativeStart.java)
任何帮助都非常感谢。谢谢。
OnLoadMoreListener类，这可能是个问题。为了确认一下，我看到了一个名为MoviesGridRecyclerViewDataAdapter的类。你是否粘贴了OnLoadMoreListener类的实际实现细节？ - Saeed Entezari