如何滚动到 RecyclerView 的底部?scrollToPosition 不起作用 [英] How to scroll to the bottom of a RecyclerView? scrollToPosition doesn't work

问题描述

我想在加载活动后滚动到 RecyclerView 列表的底部.

I'd like to scroll to the bottom of the RecyclerView list after loading the activity.

GENERIC_MESSAGE_LIST = (ArrayList) intent.getExtras().getParcelableArrayList(ConversationsAdapter.EXTRA_MESSAGE);
conversationView = (RecyclerView) findViewById(R.id.list_messages);
conversationView.setHasFixedSize(true);
conversationViewLayoutManager = new LinearLayoutManager(this);
conversationView.setLayoutManager(conversationViewLayoutManager);
conversationViewAdapter = new ConversationAdapter(GENERIC_MESSAGE_LIST, this);
conversationView.setAdapter(conversationViewAdapter);

conversationView.scrollTo(...) 抛出一个关于 RecyclerView 不支持的异常，而 conversationView.scrollToPosition(...) 似乎没有这样做任何东西.

conversationView.scrollTo(...) throws an exception about being not supported in RecyclerView, and conversationView.scrollToPosition(...) doesn't seem to do anything.

在上面的代码块之后，我添加了

After the above block of code, I added

conversationView.scrollToPosition(GENERIC_MESSAGE_LIST.size() + 1)

这不起作用.GENERIC_MESSAGE_LIST 中有 30 个元素.

which doesn't work. There are 30 elements in GENERIC_MESSAGE_LIST.

推荐答案

只需设置 setStackFromEnd=true 或 setReverseLayout=true 这样法学硕士就会从头开始布置项目.

Just set setStackFromEnd=true or setReverseLayout=true so that LLM will layout items from end.

这两者的区别在于setStackFromEnd会将视图设置为显示最后一个元素，布局方向将保持不变.(因此，在从左到右的水平 Recycler View 中，将显示最后一个元素，向左滚动将显示较早的元素)

The difference between these two is that setStackFromEnd will set the view to show the last element, the layout direction will remain the same. (So, in an left-to-right horizontal Recycler View, the last element will be shown and scrolling to the left will show the earlier elements)

而 setReverseLayout 将改变由 Adapter 添加的元素的顺序.布局将从 LTR Recycler View 中最左侧的最后一个元素开始，然后向右滚动将显示较早的元素.

Whereas setReverseLayout will change the order of the elements added by the Adapter. The layout will start from the last element, which will be the left-most in an LTR Recycler View and then, scrolling to the right will show the earlier elements.

示例:

final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
linearLayoutManager.setReverseLayout(true);
_listView.setLayoutManager(linearLayoutManager);

请参阅文档详情.

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