允许Recyclerview项目滚动到Recyclerview的顶部 [英] Allow Recyclerview Items to scroll past top of Recyclerview

问题描述

我有一个RecyclerView列表，其中希望当前选择的项目显示在RecyclerView的顶部中.但是，我仍然希望整个列表都是可滚动的，因此，从选定项目上方删除视图是不可能的解决方案.

I have a RecyclerView list, in which I want the currently selected item to be shown at the top of the RecyclerView. I still however, want the entire list to be scrollable, therefore, removing views from above the selected item is not a possible solution.

似乎我需要一种机制，其中RecyclerView项能够滚动到RecyclerView的范围之外.我不确定这是否可行，如果没有，是否有人可以确保当前选择的项目滚动到RecyclerView的顶部.

It seems I need a mechanism where the RecyclerView items are able to scroll beyond the bounds of the RecyclerView. I'm not sure if this is possible, so if it is not, does anyone have a solution to ensuring the currently selected item scrolls to the top of the RecyclerView.

我尝试过smoothScrollToPosition()，但是在RecyclerView的底部，并且希望其中一个中间项目滚动到顶部的情况下，此方法不起作用.

I have tried smoothScrollToPosition() but this doesn't work in the case of being at the bottom of the RecyclerView, and wanting one of the middle items to scroll to the top.

非常感谢

为了说明，我有4个项目的列表，由于列表中没有足够的项目，因此recyclerview无法滚动.

to Illustrate, I have a list of 4 items, the recyclerview cannot scroll as there is not enough items in the list.

然后我选择一个项目

然后我希望选定的项目滚动到顶部，但上面的项目仍可滚动.

I then want the selected item to scroll to top, but for the item above to still be scrollable.

所以，当我向上滚动...

So, when I scroll up...

推荐答案

在RecyclerView上设置等于您的项目高度三倍的底部填充，然后设置android:clipToPadding="false".这将使您的底部项目滚动到顶部，并在底部项目(但仅在底部项目)上显示填充.

On the RecyclerView set a bottom padding that is equal to three times your item's height then set android:clipToPadding="false". This will let your bottom item scroll to the top and show the padding on the bottom item but only on the bottom item.

这是一个答案，该问题很好地说明了该技术.

Here is an answer to a similar question that lays this technique out rather well.

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