一般列表刷新，會使用notifyDataChanged，會使列表整個刷新，雖然達到了效果，但是不美觀。所以，如果可以做到只刷新需要刷新的item就好了。這里就有個特好用的方法，分享給大家。

/*** 更新某一個item數據* @param nearbyNewAnchorInfo*/public void updateNearbyAndNewAnchorData(RecyclerView recyclerView, NearByNewAnchorInfo nearbyNewAnchorInfo){int headerCount = ((HeaderAndFooterWrapper) (recyclerView.getAdapter())).getHeadersCount();//極致的item刷新優化RecyclerView.ViewHolder viewHolder = recyclerView.findViewHolderForAdapterPosition(nearbyNewAnchorInfo.Index+headerCount);if (viewHolder != null && viewHolder instanceof NearbyNewViewHolder) {NearbyNewViewHolder itemHolder = (NearbyNewViewHolder) viewHolder;itemHolder.nearbyView.updateData(nearbyNewAnchorInfo.StarLiveRooms,true);itemHolder.newView.updateData(nearbyNewAnchorInfo.NearLiveRooms,true);}}

主要使用到的方法： public ViewHolder findViewHolderForAdapterPosition(int position)

/**
* Return the ViewHolder for the item in the given position of the data set. Unlike
* {@link #findViewHolderForLayoutPosition(int)} this method takes into account any pending
* adapter changes that may not be reflected to the layout yet. On the other hand, if
* {@link Adapter#notifyDataSetChanged()} has been called but the new layout has not been
* calculated yet, this method will return null since the new positions of views
* are unknown until the layout is calculated.
*

* This method checks only the children of RecyclerView. If the item at the given
* position is not laid out, it will not create a new one.
*

* When the ItemAnimator is running a change animation, there might be 2 ViewHolders
* representing the same Item. In this case, the updated ViewHolder will be returned.
*
* @param position The position of the item in the data set of the adapter
* @return The ViewHolder at position or null if there is no such item
*/

需要注意的是，這里的position指的是item在列表中的位置，而不是item數據在列表數據的位置。所以需要將列表中的頭部視圖計算進去，才可以獲取到真正該位置上的item。

總結

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