如何检查ScrollView内部的视图是否可见？
如何检查ScrollView内部的视图是否可见？
提问于 2011-01-08 02:14:40
我有一个包含一系列Views的ScrollView。我希望能够确定视图当前是否可见(如果ScrollView当前显示了视图的任何部分)。我希望下面的代码能做到这一点，但令人惊讶的是，它没有做到：
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
}回答 10
Stack Overflow用户
发布于 2012-09-15 00:04:03
这是可行的：
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
}Stack Overflow用户
发布于 2016-06-07 19:06:04
我的解决方案是使用NestedScrollView滚动元素：
final Rect scrollBounds = new Rect();
scroller.getHitRect(scrollBounds);
scroller.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
@Override
public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
if (myBtn1 != null) {
if (myBtn1.getLocalVisibleRect(scrollBounds)) {
if (!myBtn1.getLocalVisibleRect(scrollBounds)
|| scrollBounds.height() < myBtn1.getHeight()) {
Log.i(TAG, "BTN APPEAR PARCIALY");
} else {
Log.i(TAG, "BTN APPEAR FULLY!!!");
}
} else {
Log.i(TAG, "No");
}
}
}
});
}Stack Overflow用户
发布于 2013-07-11 23:08:04
要使用getLocalVisibleRect扩展Bill Mote的答案，您可能需要检查视图是否仅部分可见：
Rect scrollBounds = new Rect();
scrollView.getHitRect(scrollBounds);
if (!imageView.getLocalVisibleRect(scrollBounds)
|| scrollBounds.height() < imageView.getHeight()) {
// imageView is not within or only partially within the visible window
} else {
// imageView is completely visible
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/4628800
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