RecyclerView 数据更新方法 notifyItemChanged/notifyItemInsert/notifyIteRemoved
- notifyItemInserted
- notifyItemRemoved
- notifyItemChanged
notifyItemInserted
java.lang.IndexOutOfBoundsException:
Inconsistency detected. Invalid view holder adapter positionViewHolder{424b7690 position=7 id=-1, oldPos=8,pLpos:8 scrap tmpDetached no parent} at
android.support.v7.widget.RecyclerView$Recycler.validat
eViewHolderForOffsetPosition(RecyclerView.java:4349)
工作中遇到如下问题 notifyItemInserted(list.size()-1)，一个一个的插入也没什么问题，但是快速连续插入的话就会报出IndexOutOfBoundExcetion的异常，然后崩溃。经过多方查找，翻阅Android 的相关文档，发现如下解决方法。
使用notifyItemInserted方法向末尾处添加item的时候，要使用如下的方式
notifyItemInserted(list.size());
其中list.size()才能正确的计算出插入的位置，然后在调用
notifyItemChanged(list.size());
notifyItemRemoved
使用 notifyItemRemoved方法删除时，需要使用getLayoutPosition计算位置
否则也会报出IndexOutOfBoundExcetion异常，同时使用notifyItemChanged(removePos);方法刷新一下
notifyItemChanged
事实上RecyclerView的notifyItemChanged的底层调用的是notifyItemRangeChanged：
/*** Notify any registered observers that the item at <code>position</code> has changed.* Equivalent to calling <code>notifyItemChanged(position, null);</code>.** <p>This is an item change event, not a structural change event. It indicates that any* reflection of the data at <code>position</code> is out of date and should be updated.* The item at <code>position</code> retains the same identity.</p>** @param position Position of the item that has changed** @see #notifyItemRangeChanged(int, int)*/public final void notifyItemChanged(int position) {mObservable.notifyItemRangeChanged(position, 1);}
该方法使得RecyclerView批量范围内（range）数据更新，notifyItemChanged巧妙的将第二个参数计数器设置为1得以实现。
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