Android alpha 动画淡入淡出带延迟

发布于 2024-09-10 22:30:05 字数 896 浏览 8 评论 0原文

我想做一个非常简单的阿尔法动画,但我找不到有效的方法。

这个想法是在视图上执行此动画:

  1. 从 0 到 1 的 1 秒的 alpha
  2. 将 alpha 保持在 1 5 秒,
  3. 从 1 到 0 的 1 秒
  4. 将 alpha 保持在 0 5 秒。
  5. 从 1 重新开始。

我尝试使用 AnimationSet 来实现它:

AnimationSet animationSet = new AnimationSet(true);

Animation animation1 = new AnimationUtils.loadAnimation(this, android.R.anim.fade_in);
animation1.setDuration(1000);

Animation animation2 = new AnimationUtils.loadAnimation(this, android.R.anim.fade_out);
animation2.setDuration(1000);
animation2.setStartOffset(5000);

Animation animation3 = new AlphaAnimation(0.0f, 0.0f);
animation3.setDuration(4000)
animation3.setStartOffset(6000);

animationSet.add(animation1);
animationSet.add(animation2);
animationSet.add(animation3);

等等。

但是第三个动画似乎弄乱了所有的 alpha 动画,我认为这会导致 Android 管理方式的内部不连贯这种类型的动画。

有什么想法吗?

谢谢。

I want to do a very simple alpha animation but I cannot find a valid way.

The idea is to perform this animation over a view:

  1. alpha from 0 to 1 of 1 second
  2. hold alpha at 1 for 5 seconds
  3. alpha from 1 to 0 of 1 second
  4. hold alpha at 0 for 5 seconds.
  5. start again on 1.

I've tried to implement that with an AnimationSet as:

AnimationSet animationSet = new AnimationSet(true);

Animation animation1 = new AnimationUtils.loadAnimation(this, android.R.anim.fade_in);
animation1.setDuration(1000);

Animation animation2 = new AnimationUtils.loadAnimation(this, android.R.anim.fade_out);
animation2.setDuration(1000);
animation2.setStartOffset(5000);

Animation animation3 = new AlphaAnimation(0.0f, 0.0f);
animation3.setDuration(4000)
animation3.setStartOffset(6000);

animationSet.add(animation1);
animationSet.add(animation2);
animationSet.add(animation3);

etc..

but it seams that the third animation do a mess with all the alpha animations, I supose that this cause an internal incoherence in the way that Android manage this type of animation.

Any idea?

Thank you.

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评论(4

夜无邪 2024-09-17 22:30:05

好的,记住这两点来解决这个问题


  • 如果我想在 5 秒后将 1.0f 变为 0.0f,动画持续时间为 1 秒,这最终是一个 1 秒的动画,暂停 5 秒。

    要实现这一点:

    1. setDuration(1000)(持续时间为 1 秒)
    2. setStartOffset(5000)(5秒后开始)

  • 您只需要 2 个动画这将永远循环。

    1.0.0f 至 1.0f,暂停 5 秒,持续时间 1 秒

    2.1.0f 到 0.0f,暂停 5 秒,持续时间 1 秒


代码如下:

    animation1 = new AlphaAnimation(0.0f, 1.0f);
    animation1.setDuration(1000);
    animation1.setStartOffset(5000);

    animation2 = new AlphaAnimation(1.0f, 0.0f);
    animation2.setDuration(1000);
    animation2.setStartOffset(5000);

    textView.startAnimation(animation1);

然而,为了永远循环,我将使用AnimationListener,因为repeatCount有问题:

    animation1 = new AlphaAnimation(0.0f, 1.0f);
    animation1.setDuration(1000);
    animation1.setStartOffset(5000);

    //animation1 AnimationListener
    animation1.setAnimationListener(new AnimationListener(){

        @Override
        public void onAnimationEnd(Animation arg0) {
            // start animation2 when animation1 ends (continue)
            textView.startAnimation(animation2);
        }

        @Override
        public void onAnimationRepeat(Animation arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationStart(Animation arg0) {
            // TODO Auto-generated method stub

        }

    });

    animation2 = new AlphaAnimation(1.0f, 0.0f);
    animation2.setDuration(1000);
    animation2.setStartOffset(5000);

    //animation2 AnimationListener
    animation2.setAnimationListener(new AnimationListener(){

        @Override
        public void onAnimationEnd(Animation arg0) {
            // start animation1 when animation2 ends (repeat)
            textView.startAnimation(animation1);
        }

        @Override
        public void onAnimationRepeat(Animation arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationStart(Animation arg0) {
            // TODO Auto-generated method stub

        }

    });

    textView.startAnimation(animation1);

Ok Keep in mind these 2 points to solve this


  • If I want to animate 1.0f to 0.0f after 5 seconds with an animation duration of 1 seconds, this is ultimately a 1 second animation with a pause of 5 seconds.

    To acheive this:

    1. setDuration(1000) (it has a 1 second duration)
    2. setStartOffset(5000) (it will start after 5 seconds)

  • You only need 2 animations that will loop forever.

    1.0.0f to 1.0f with 5 seconds pause and 1 second duration

    2.1.0f to 0.0f with 5 seconds pause and 1 second duration


And here is the code:

    animation1 = new AlphaAnimation(0.0f, 1.0f);
    animation1.setDuration(1000);
    animation1.setStartOffset(5000);

    animation2 = new AlphaAnimation(1.0f, 0.0f);
    animation2.setDuration(1000);
    animation2.setStartOffset(5000);

    textView.startAnimation(animation1);

However to loop forever I will use AnimationListener because repeatCount is buggy:

    animation1 = new AlphaAnimation(0.0f, 1.0f);
    animation1.setDuration(1000);
    animation1.setStartOffset(5000);

    //animation1 AnimationListener
    animation1.setAnimationListener(new AnimationListener(){

        @Override
        public void onAnimationEnd(Animation arg0) {
            // start animation2 when animation1 ends (continue)
            textView.startAnimation(animation2);
        }

        @Override
        public void onAnimationRepeat(Animation arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationStart(Animation arg0) {
            // TODO Auto-generated method stub

        }

    });

    animation2 = new AlphaAnimation(1.0f, 0.0f);
    animation2.setDuration(1000);
    animation2.setStartOffset(5000);

    //animation2 AnimationListener
    animation2.setAnimationListener(new AnimationListener(){

        @Override
        public void onAnimationEnd(Animation arg0) {
            // start animation1 when animation2 ends (repeat)
            textView.startAnimation(animation1);
        }

        @Override
        public void onAnimationRepeat(Animation arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onAnimationStart(Animation arg0) {
            // TODO Auto-generated method stub

        }

    });

    textView.startAnimation(animation1);
慈悲佛祖 2024-09-17 22:30:05

对此有一个更简单的解决方案。

假设您的视图处于 GONE 状态。要为其可见性设置动画:

yourView.setVisibility(View.VISIBLE);
yourView.animate().alpha(1).setDuration(300);

通过相同的方式您可以添加动画侦听器。

这也适用于缩放和平移动画。

There is a simpler solution to this.

Lets assume that your view is in state GONE. To animate to its visibility:

yourView.setVisibility(View.VISIBLE);
yourView.animate().alpha(1).setDuration(300);

Through the same way you can add animation listeners.

This also works for scale and translation animations.

神经暖 2024-09-17 22:30:05

试试这个

val shortAnimationDuration = 1000
            yourView.apply {
                alpha = 0f
                animate()
                    .alpha(1f)
                    .setDuration(shortAnimationDuration.toLong())
                    .setListener(object :AnimatorListenerAdapter(){
                        override fun onAnimationEnd(animation: Animator?) {
                           //You can add what you want to do after completing animation
                        }
                    })
            }

这是一个淡入动画。如果您想要淡出,只需交换 alpha 值即可。

Try This

val shortAnimationDuration = 1000
            yourView.apply {
                alpha = 0f
                animate()
                    .alpha(1f)
                    .setDuration(shortAnimationDuration.toLong())
                    .setListener(object :AnimatorListenerAdapter(){
                        override fun onAnimationEnd(animation: Animator?) {
                           //You can add what you want to do after completing animation
                        }
                    })
            }

This is a Fade in animation. If you want Fade out you just swap the alpha values.

殤城〤 2024-09-17 22:30:05

在我的解决方案中,我在任何通用视图的 util 函数中使用动画,并且我能够通过以这种方式定义内联值来实现这一点:

fun View.fadeIn(durationMillis: Long = 250, delay: Long = 1000) {
    this.startAnimation(AlphaAnimation(0F, 1F).apply {
        duration = durationMillis
        startOffset = delay
        fillAfter = true
    })
}

In my solution, I am using the animation inside a util function for any generic View and I was able to achieved this by defining the values inline this way:

fun View.fadeIn(durationMillis: Long = 250, delay: Long = 1000) {
    this.startAnimation(AlphaAnimation(0F, 1F).apply {
        duration = durationMillis
        startOffset = delay
        fillAfter = true
    })
}
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