[英]How to use ValueAnimator#ofFloat
I'm so confused as to how ValueAnimator works in Android. 我对ValueAnimator在Android中的工作方式感到困惑。 Here's a code snippet (pseudo):
这是一个代码片段(伪):
Log("animating: ", start, end);
ValueAnimator animator = ValueAnimator.ofFloat(start, end);
animator.setUpdateListener(() -> {
Log("update", animation.getAnimatedFraction());
});
animator.start();
I see the following in my logs: 我在日志中看到以下内容:
animating: 0.0 to 1.0
update: 0.0
update: 0.05
..
update: 1.0
animating: 1.0 to 0.0
update: 0.0 (wtf)
update: 0.05
..
update: 1.0
animating: 0.5 to 1.0
update: 1.0 (wtf)
update: 1.0
Can someone explain to me why my update function is getting these strange values? 有人可以向我解释为什么我的更新功能得到这些奇怪的值吗?
Why don't you use getAnimatedValue
? 为什么不使用
getAnimatedValue
? It's exactly that value that calculated while property changing, it's not a fraction: 正是在属性更改时计算出的那个值,而不是分数:
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
public void onAnimationUpdate(ValueAnimator animation) {
Float value = (Float) animation.getAnimatedValue();
Log("update", String.valueOf(value));
}
});
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