Android: how to check if a View inside of ScrollView is visible?

android scrollview visible
ab11 picture ab11 · Jan 7, 2011 · Viewed 96k times · Source

I have a ScrollView which holds a series of Views. I would like to be able to determine if a view is currently visible (if any part of it is currently displayed by the ScrollView). I would expect the below code to do this, surprisingly it does not:

Rect bounds = new Rect();
view.getDrawingRect(bounds);

Rect scrollBounds = new Rect(scroll.getScrollX(), scroll.getScrollY(), 
        scroll.getScrollX() + scroll.getWidth(), scroll.getScrollY() + scroll.getHeight());

if(Rect.intersects(scrollBounds, bounds))
{
    //is  visible
}

Answer

Bill Mote picture Bill Mote · Sep 14, 2012

This works:

Rect scrollBounds = new Rect();
scrollView.getHitRect(scrollBounds);
if (imageView.getLocalVisibleRect(scrollBounds)) {
    // Any portion of the imageView, even a single pixel, is within the visible window
} else {
    // NONE of the imageView is within the visible window
}

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