[移动开发]【Android】如何判断Item在RecyclerView中是否滑动到顶部或底部

• 方法1: 比较推荐,和你设置的layoutManager无关

_recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
	override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
    	super.onScrolled(recyclerView, dx, dy)
        if (!_recyclerView.canScrollVertically(1)) {
        	//滑动到底部
        }
        if (!_recyclerView.canScrollVertically(-1)) {
        	//滑动到顶部
        }
    }
})

• 方法2

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

        val layoutManager = recyclerView.layoutManager as LinearLayoutManager
        val firstCompletelyVisibleItemPosition = layoutManager.findFirstCompletelyVisibleItemPosition()
        if (firstCompletelyVisibleItemPosition == 0) {
        	//滑动到顶部
		}

		val lastCompletelyVisibleItemPosition = layoutManager.findLastCompletelyVisibleItemPosition()
        if (lastCompletelyVisibleItemPosition == layoutManager.getItemCount() - 1) {
        	//滑动到底部
        }
    }
})

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