i have two horizontal scroll views each containing a linear layout item under it. how is it possible to synchronize the scroll, when either of it is scrolled, the other is also automatically scrolled. any help?
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2 Answers
What you could do is on the onTouch of the first Horizontal Scroll view, record the X position that it started with for an action of Down. Then when you have an action of Move, record the change in the X position. Then you can call the second horizontal scroll view's scrollBy (deltaX, 0). On an action of Up or Cancel, make sure to reset your state variables.
I've done this with a List View scrolling a vertical scroll, just using Y positions instead of X. Here is my code to accomplish this. The concurrentScroller is my vertical view.
if(concurrentScroller != null) { int deltaY = (int) (startTouchConcurrentY - ev.getY()); startTouchConcurrentY = ev.getY(); concurrentScroller.scrollBy(0, deltaY); } 
2 Comments
thanhbinh84
This solution doesn't work when flipping, the first view keeps going while as the second just move an deltaY movement. :(
any idea about this one ? stackoverflow.com/questions/58848391/…
I would implement onScrollListener for each of the views to call scrollTo on the other.
answered Jun 28, 2011 at 15:54
Alexandru Cristescu
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3 Comments
calinb
Which views? There is no
onScrollListener method for HorizontalScrollView.
Alexandru Cristescu
scrollView.getViewTreeObserver().addOnScrollChangedListener(new OnScrollChangedListener(){...});Hi Alexandru, any idea about this one ? stackoverflow.com/questions/58848391/…