How to hide a view if scroll view is at top?

Question

How can I detect if a scroll view is scrolled to the top? I would like to hide a view if the scroll view is not scrolled to the top and show if it is. I am coding this in kotlin.

It's sound a bit like a reason to use Coordinator Layout: https://medium.com/martinomburajr/android-design-coordinator-layout-1-an-introduction-10a1b91ded28 — Cililing, Oct 17 '19 at 06:43

score 3 · Accepted Answer · answered Oct 17 '19 at 06:24

there are many ways to get scroll position,

scrollView.viewTreeObserver.addOnScrollChangedListener {
    if (scrollView.scrollY <= 0) {
        // scroll top
    } else {
        // other
    }
}

requires API level 23

scrollView.setOnScrollChangeListener { _, _, scrollY, _, _ ->
    if (scrollY <= 0) {
        // scroll top
    } else {
        // other
    }
}

Can I have onScrollListener for a ScrollView?

this link will help you

score 0 · Answer 2 · edited Oct 17 '19 at 07:36

0

scrollView.getViewTreeObserver().addOnScrollChangedListener(OnScrollChangedListener {
                val scrollY = rootScrollView.getScrollY() 
                val scrollX = rootScrollView.getScrollX() // Use this coordinate to know where you are

})

edited Oct 17 '19 at 07:36

Akshay Raiyani

1,243
9
21

answered Oct 17 '19 at 07:18

Satyam Naik

21
3

How to hide a view if scroll view is at top?

2 Answers2