默認的插值器好像不是線性的Linear插值器,8'10''左右
看動畫，以及經(jīng)驗，好像是先加速后減速插值器
wly2014
2015-01-21
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2016-02-29
看ValueAnimator 源碼的說明確實是樓上所說的那樣
By default, ValueAnimator uses non-linear time interpolation, via the
?* {@link AccelerateDecelerateInterpolator} class, which accelerates into and decelerates
?* out of an animation. This behavior can be changed by calling
?* {@link ValueAnimator#setInterpolator(TimeInterpolator)}.</p>