Fade In Fade Out Android Animation in Java

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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);

If you are using Kotlin

val fadeIn = AlphaAnimation(0f, 1f)
fadeIn.interpolator = DecelerateInterpolator() //add this
fadeIn.duration = 1000

val fadeOut = AlphaAnimation(1f, 0f)
fadeOut.interpolator = AccelerateInterpolator() //and this
fadeOut.startOffset = 1000
fadeOut.duration = 1000

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

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