Question

I am trying to animate a view which expands and shrinks back to the initial size. I tried using animation set to add two animations so that the second animation will start after the first animation but was not able to get it working.

AnimationSet expandAndShrink = new AnimationSet(true);
ScaleAnimation expand = new ScaleAnimation(
     1f, 1.5f, 
     1f, 1.5f,
     Animation.RELATIVE_TO_PARENT, 0,
     Animation.RELATIVE_TO_PARENT, 0);

ScaleAnimation shrink = new ScaleAnimation(
     1.5f, 1f, 
     1.5f, 1f,
     Animation.RELATIVE_TO_PARENT, 1f,
     Animation.RELATIVE_TO_PARENT, 1f);

expandAndShrink.addAnimation(expand);
expandAndShrink.addAnimation(shrink)
expandAndShrink.setFillAfter(true);
expandAndShrink.setDuration(1000);
expandAndShrink.setInterpolator(new AccelerateInterpolator(1.0f));

view.bringToFront();
view.startAnimation(expandAndShrink);

I really appreciate any help to get it working. Thanks in advance

Answer 1

I have fixed “expand” and “shrink” animations, and added durations for both. Also you should add shrink.setStartOffset(1000); so second animation starts later

    AnimationSet expandAndShrink = new AnimationSet(true);
    ScaleAnimation expand = new ScaleAnimation(
         1f, 1.5f, 
         1f, 1.5f,
         Animation.RELATIVE_TO_PARENT, 0,
         Animation.RELATIVE_TO_PARENT, 0);
    expand.setDuration(1000);

    ScaleAnimation shrink = new ScaleAnimation(
         1.5f, 1f, 
         1.5f, 1f,
         Animation.RELATIVE_TO_PARENT, 0f,
         Animation.RELATIVE_TO_PARENT, 0f);
    shrink.setStartOffset(1000);
    shrink.setDuration(1000);

    expandAndShrink.addAnimation(expand);
    expandAndShrink.addAnimation(shrink);
    expandAndShrink.setFillAfter(true);
    expandAndShrink.setInterpolator(new AccelerateInterpolator(1.0f));

    view.startAnimation(expandAndShrink);