ListView UI重绘时触发layoutChildren， 此时会校验listView的mItemCount与其Adapter.getCount是否相同，不同报错。

ListView.layoutChildren:

mItemCount是在父类AdapterView中定义的,package类型

在两个地方mItemCount会被赋值，初始设置Adapter时：
xxAdapter.notifyDataSetChanged时：
因此一定要确保修改adapter数据和notifyDataSetChanged是coupled出现的，否则在特定时序下很容易出现上述异常。

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