如何在片段内的recyclerview上使用简单的onscroll侦听器 [英] How to use a simple onscroll listener on a recyclerview that is inside a fragment

问题描述

我一直在互联网上四处寻找，找不到适合我的答案.

Ive been looking all over the internet and cant find the answer that works for me.

我正在尝试使用无限滚动条创建片段(就像在Twitter，Facebook，Instagram，Tumblr等社交网络应用程序上一样)，研究表明，回收站视图是最好的方法.此图像向您展示了我是如何做到的.文件->新->片段->片段(列表)

I am trying to create a fragment with an infinite scroller (just like on social network apps like twitter, facebook, instagram, tumblr etc ) and research suggests that a recycler view is the best way. This image show you how i have done it. File -> new -> Fragment -> Fragment (List)

如果我是正确的，那么下一步就是创建一个滚动侦听器，这样我就知道用户何时滚动到底部，就像我加载更多数据一样.

If I'm correct, the next step now is to create an on scroll listener so that i know when the user has scrolled to the bottom as that would be when i load more data.

如果到目前为止，我还不明白，我认为它位于MyContentRecyclerViewAdapter文件中我必须弄清楚如何将我的下一部分代码放置在scrollListener上

If i have understood things so far, i think its inside the file MyContentRecyclerViewAdapter here that i have to figure out how where to put my next bit of code for the scrollListener

` list.addOnScrollListener(object : RecyclerView.OnScrollListener() {
        override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
            super.onScrolled(recyclerView, dx, dy)

            if (dy > 0) {

                Toast.makeText(list.context,"Scrolling up", Toast.LENGTH_SHORT).show()
                // Scrolling up
            } else {
                Toast.makeText(list.context,"Scrolling down", Toast.LENGTH_SHORT).show()
                // Scrolling down
            }
        }

    })`

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回复Lalit Fauazdar.这就是我现在得到的，但是由于某种原因这导致我的应用程序崩溃.即使我的androidx.recyclerview.widget.RecyclerView具有android:id="@+id/list"，列表由于某些原因仍显示为空值.

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Replying to Lalit Fauazdar. This is what I've got right now however for some reason this causes my app to crash. list appears to have a null value for some reason even though my androidx.recyclerview.widget.RecyclerView has android:id="@+id/list".

推荐答案

对于无限滚动，我建议您使用此由Google提供的库.

For infinite scrolling I would recommend you to use this library provided by Google.

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