android-Instagram的心脏动画模仿-FadeScale动画

我正在尝试创建类似于instagram双击动画的动画,其中,心脏在淡入时从中心放大,然后保持一点点可见,然后在淡出时从中心缩小.

我正在使用此动画：

public void animateHeart(final ImageView view) {
AnimationSet animation = new AnimationSet(true);
animation.addAnimation(new AlphaAnimation(0.0f, 1.0f));
animation.addAnimation(new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f));
animation.setDuration(700);
animation.setRepeatMode(Animation.REVERSE);
view.startAnimation(animation);
}

它对于出现的动画效果很好,但是动画不会反转.
另外,我只希望它动画一次.

有人可以告诉我我在做什么错吗？
提前致谢.

解决方法:

您只用代码开始一个Scale和Alpha动画.

这行：

animation.setRepeatMode(Animation.REVERSE);

显然在AnimationSet中效果不佳,因此您必须将其分别应用于每个Animation.我会推荐这样的东西：

public void animateHeart(final ImageView view) {
    ScaleAnimation scaleAnimation = new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f,
            Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
    prepareAnimation(scaleAnimation);

    AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 1.0f);
    prepareAnimation(alphaAnimation);

    AnimationSet animation = new AnimationSet(true);
    animation.addAnimation(alphaAnimation);
    animation.addAnimation(scaleAnimation);
    animation.setDuration(700);
    animation.setFillAfter(true);

    view.startAnimation(animation);

}

private Animation prepareAnimation(Animation animation){
    animation.setRepeatCount(1);
    animation.setRepeatMode(Animation.REVERSE);
    return animation;
}

不要忘记

animation.setFillAfter(true);

否则,当动画结束时,您的心会再次出现.

标签：animation,android-imageview,android
来源： https://codeday.me/bug/20191027/1944459.html