Android:如何检查 ScrollView 内的 View 是否可见？

Question

我有一个 ScrollView，其中包含一系列 Views。我希望能够确定一个 View 当前是否可见(如果它的任何部分当前由 ScrollView 显示)。我希望下面的代码可以做到这一点，令人惊讶的是它没有:

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 1

这行得通:

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
}