淡入淡出的Andr​​oid动画在Java中 [英] Fade In Fade Out Android Animation in Java

问题描述

我想有一个花费1000毫秒衰落，然后1000ms的淡出了ImageView的的2秒的动画。

I want to have a 2 second animation of an ImageView that spends 1000ms fading in and then 1000ms fading out.

下面是我到目前为止在我的ImageView的构造函数：

Here's what I have so far in my ImageView constructor:

Animation fadeIn = new AlphaAnimation(0, 1);
fadeIn.setDuration(1000);

Animation fadeOut = new AlphaAnimation(1, 0);
fadeOut.setStartOffset(1000);
fadeOut.setDuration(1000);

AnimationSet animation = new AnimationSet(true);
animation.addAnimation(fadeIn);
animation.addAnimation(fadeOut);
this.setAnimation(animation);

当我运行动画的没有的显示出来。然而，当我删除了阿尔法的动画之一，行为正常工作。

When I run that animation, nothing shows up. However, when I remove one of the alpha animations, the behavior works as expected.

东西：

• setFillBefore ， setFillAfter 的每一个可以想到的组合，而 setFillEnabled 。
• 添加 LinearInterpolator 到 AnimationSet 。

• Every conceivable combination of setFillBefore, setFillAfter, and setFillEnabled.
• Adding a LinearInterpolator to the AnimationSet.

推荐答案

想通了我自己的问题。最终的解决方案是基于在插补器。

Figured out my own problem. The solution ended up being based in interpolators.

Animation fadeIn = new AlphaAnimation(0, 1);
fadeIn.setInterpolator(new DecelerateInterpolator()); //add this
fadeIn.setDuration(1000);

Animation fadeOut = new AlphaAnimation(1, 0);
fadeOut.setInterpolator(new AccelerateInterpolator()); //and this
fadeOut.setStartOffset(1000);
fadeOut.setDuration(1000);

AnimationSet animation = new AnimationSet(false); //change to false
animation.addAnimation(fadeIn);
animation.addAnimation(fadeOut);
this.setAnimation(animation);

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