Android 如何动画滚动位置？如何平滑滚动？
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How to animate scroll position? How to scroll smoothly?
提问by Suzan Cioc
I wish to move smoothly to next scroll position in my custom view (on button press or event). How to implement this? First of all I can't see scroll animation class (only alpha, rotate, scale and translate). Secondly, having animation class, I can't see iterative one (say to scroll 100 pixels rights whatever position we have) only absolute ones (i.e. to animate from one constant value to another).
我希望平滑地移动到自定义视图中的下一个滚动位置（按下按钮或事件时）。如何实施？首先，我看不到滚动动画类（只有 alpha、旋转、缩放和平移）。其次，有动画类，我看不到迭代的（比如在我们拥有的任何位置滚动 100 像素的权利）只有绝对的（即从一个常数值动画到另一个）。
回答by Ian Warwick
Assuming you are using a ScrollView, does smoothScrollTo(...) work for you?
假设您使用的是 ScrollView，那么 smoothScrollTo(...) 对您有用吗？
http://developer.android.com/reference/android/widget/ScrollView.html#smoothScrollTo%28int,%20int%29
http://developer.android.com/reference/android/widget/ScrollView.html#smoothScrollTo%28int,%20int%29
回答by anton46
Using ObjectAnimator, this is a sample for scrolling to top:
使用ObjectAnimator，这是滚动到顶部的示例：
public void scrollToTop() {
int x = 0;
int y = 0;
ObjectAnimator xTranslate = ObjectAnimator.ofInt(mScrollView, "scrollX", x);
ObjectAnimator yTranslate = ObjectAnimator.ofInt(mScrollView, "scrollY", y);
AnimatorSet animators = new AnimatorSet();
animators.setDuration(1000L);
animators.playTogether(xTranslate, yTranslate);
animators.addListener(new AnimatorListener() {
@Override
public void onAnimationStart(Animator arg0) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationRepeat(Animator arg0) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationEnd(Animator arg0) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationCancel(Animator arg0) {
// TODO Auto-generated method stub
}
});
animators.start();
}
回答by numan salati
Animating scroll is done through a combination of using Scroller/OverScroller(to compute the time interpolated values of your scroll offsets), GestureDetectors(to start the scroller object) and the onComputeScrollmethod of a View (which implicitly is your animation loop).
滚动动画是通过结合使用Scroller/OverScroller（计算滚动偏移的时间插值）、GestureDetectors（启动滚动对象）和View的onComputeScroll方法（隐式是您的动画循环）来完成的。
The official android docs now have a detailed tutorial on precisely this topic. http://developer.android.com/training/gestures/scroll.html
官方 android 文档现在有一个关于这个主题的详细教程。http://developer.android.com/training/gestures/scroll.html
回答by Lawrence D'Oliveiro
See the view_cache_demosample code to see how to do animated scrolling. It works in 2D, caches complex drawing and also handles fling gestures, but you can simplify all that as necessary.
请参阅view_cache_demo示例代码以了解如何进行动画滚动。它可以在 2D 中工作，缓存复杂的绘图，还可以处理滑动手势，但您可以根据需要简化所有这些。
