java - Android onAnimationEnd 调用了两次

Question

我已经在 View 上创建了一个 SLIDE UP 动画，我在 onAnimationEnd 上再次重复这个动画，但是我的 onAnimationEnd 触发了两次，我已经用 onAnimationEnd 的计数器检查了它，我会发布我的代码，你可以检查 onAnimationEnd 中的计数器是否会同时递增两次，我在onAnimationEnd方法中再次开始动画，请指导我哪里做错了？

    private Animation animSlideUp;
        animSlideUp = AnimationUtils.loadAnimation(getActivity(), R.anim.slide_up);
                // set animation listener
                animSlideUp.setAnimationListener(this);
                animSlideUp.setDuration(500);
                animSlideUp.setStartOffset(5000);

                tickerView.startAnimation(animSlideUp);

        @Override
        public void onAnimationStart(Animation animation) {

        }

        @Override
        public void onAnimationEnd(Animation animation) {
            if (animation == animSlideUp) {
                ticker_counter++;
                Log.e("onAnimationEnd=", "ticker_counter="+ticker_counter);
                tickerView.startAnimation(animSlideUp);

            }
        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

slide_up.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true" >

    <scale
        android:duration="500"
        android:fromXScale="1.0"
        android:fromYScale="1.0"
        android:interpolator="@android:anim/linear_interpolator"
        android:toXScale="1.0"
        android:toYScale="0.0"/>

</set>
LOGCAT

    11-19 17:06:54.375   E/onAnimationEnd=﹕ ticker_counter=1
    11-19 17:06:54.392   E/onAnimationEnd=﹕ ticker_counter=2
    11-19 17:06:59.912   E/onAnimationEnd=﹕ ticker_counter=3
    11-19 17:06:59.928   E/onAnimationEnd=﹕ ticker_counter=4
    11-19 17:07:05.453   E/onAnimationEnd=﹕ ticker_counter=5
    11-19 17:07:05.470   E/onAnimationEnd=﹕ ticker_counter=6
    11-19 17:07:10.991   E/onAnimationEnd=﹕ ticker_counter=7
    11-19 17:07:11.008   E/onAnimationEnd=﹕ ticker_counter=8

Answer 1

如果你想让你的动画播放一次，你必须移除 tickerView.startAnimation(animSlideUp);来自 onAnimationEnd 方法。
避免使用 xml 动画，在 java 代码中更容易。
如果您尝试为两个属性设置动画:

PropertyValuesHolder pvhX = PropertyValuesHolder.ofFloat("scaleX", 1.0f, 0);
PropertyValuesHolder pvhY = PropertyValuesHolder.ofFloat("scaleY", 1.0f, 0);
ObjectAnimator animator = ObjectAnimator.ofPropertyValuesHolder(tickerView, pvhX, pvhY);
        animator.setDuration(500);
        animator.start();

在您的情况下，您只是将 scaleY 值从 1.0 更改为 0，因此请使用:

ObjectAnimator animator = ObjectAnimator.ofFloat(tickerView, "scaleY",0);
animator.setDuration(500);
//To repeat twice if you want to
animator.setRepeatCount(1);
animator.start();

默认使用LinearInterpolator。

每 5 秒重复一次

    final ObjectAnimator animator = ObjectAnimator.ofFloat(tickerView, "scaleY", 0);
    animator.setDuration(500);
    animator.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {
        }

        @Override
        public void onAnimationEnd(Animator animation) {
            ticker_counter++;
            animation.setStartDelay(5000);
            animator.start();
        }

        @Override
        public void onAnimationCancel(Animator animation) {

        }

        @Override
        public void onAnimationRepeat(Animator animation) {
        }
    });
    animator.start();