RecyclerView在添加數(shù)據(jù)的時候發(fā)生了異常.
java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid view holder adapter positionViewHolder{f82aa71 position=11 id=-1, oldPos=6, pLpos:6 scrap [attachedScrap] tmpDetached not recyclable(1) 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)
...
在RecyclerView#validateViewHolderForOffsetPosition(ViewHolder holder)中
if (holder.mPosition < 0 || holder.mPosition >= mAdapter.getItemCount()) {
throw new IndexOutOfBoundsException("Inconsistency detected. Invalid view holder "
+ "adapter position" + holder);
}
holder.mPosition >= mAdapter.getItemCount()為真，拋出了異常
發(fā)現(xiàn)mAdapter.getItemCount() 的值是正常的，但是holder.mPosition值有問題况木，在某種情況下和getItemCount的值一樣大乃坤，此時條件為真。
接下來看了下RecyclerView中有5個方法改變了mPosition的值,分別是
Adapter#bindViewHolder()ViewHolder#resetInternal()ViewHolder#offsetPosition()ViewHolder#flagRemovedAndOffsetPosition()Recycler#tryGetViewHolderForPositionByDeadline()
分別打了斷點(diǎn)弄贿，發(fā)現(xiàn)會引起崩潰的代碼,會改變mPosition的有其中三個地方resetInternal()春锋，offsetPosition()，bindViewHolder()差凹。
resetInternal() 首先排除 期奔，因?yàn)?code>mPosition = NO_POSITION;
然后仔細(xì)查看offsetPosition() 和bindViewholder()中的值發(fā)現(xiàn)侧馅，offsetPosition()的值mPosition += offset;會超出mPosition的值的范圍。
所以現(xiàn)在就要去找這個方法被調(diào)用的時機(jī)和offset這個值的含義
- 查看
offsetPosition()的調(diào)用,發(fā)現(xiàn)調(diào)用分別來自RecyclerView與RecyclerView.Recycler兩個的對應(yīng)的insert,move和remove方法,以及ViewHolder的flagRemovedAndOffsetPosition(int, int, boolean)的方法
主要看就下面這個
void offsetPositionRecordsForInsert(int positionStart, int itemCount) {
//...
//這里將itemCount 傳遞給了offsetPosition
holder.offsetPosition(itemCount, false);
//...
mRecycler.offsetPositionRecordsForInsert(positionStart, itemCount);
requestLayout();
}
看起來在某個刷新數(shù)據(jù)的地方理解錯了itemCount呐萌，找到我自己Adapter代碼里面的
notifyItemRangeInserted(positionStart,itemCount);暫時修改為notifyDataSetChanged()不會報(bào)錯了
