在滚动视图中降低平滑滚动的速度

Question

我有一个滚动视图.我执行了smooth-scroll.using smoothScrollBy().一切正常,但我想改变平滑滚动的持续时间.平滑滚动发生得非常快,用户不了解发生了什么.请帮我降低平滑滚动速度？

Answer 1

简单的答案就是替换

scrollView.smoothScrollTo(0, scrollTo);

同

ObjectAnimator.ofInt(scrollView, "scrollY",  scrollTo).setDuration(duration).start();

这里duration是你希望它在几毫秒的时间.

Answer 2

请尝试以下代码:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
{
    ValueAnimator realSmoothScrollAnimation = 
        ValueAnimator.ofInt(parentScrollView.getScrollY(), targetScrollY);
    realSmoothScrollAnimation.setDuration(500);
    realSmoothScrollAnimation.addUpdateListener(new AnimatorUpdateListener()
    {
        @Override
        public void onAnimationUpdate(ValueAnimator animation)
        {
            int scrollTo = (Integer) animation.getAnimatedValue();
            parentScrollView.scrollTo(0, scrollTo);
        }
    });

    realSmoothScrollAnimation.start();
}
else
{
    parentScrollView.smoothScrollTo(0, targetScrollY);
}

Answer 3

whichScreen = Math.max(0, Math.min(whichScreen, getBase().getDocumentModel().getPageCount()-1));
mNextScreen = whichScreen;
final int newX = whichScreen * getWidth();
final int delta = newX - getScrollX();
//scroller.startScroll(getScrollX(), 0, delta, 0, Math.abs(delta) * 2);
scroller.startScroll(getScrollX(), 0, delta, 0, Math.abs(delta));
invalidate();