Android Scale Animation with bounce interpolator

Question

I am doing a scale animation with anim xml as follows. The animation interpolator isn\'t working. I am trying to have bounce interpolator but isn\'t working.

Answer 1

Finally got the solution. It works for me and could be helpful to others. The key was to put the android:interpolator tag in the animation set.

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/bounce_interpolator" >

<scale
    android:duration="600"
    android:fromXScale="1"
    android:fromYScale="0.5"
    android:pivotX="50%"
    android:pivotY="0%"
    android:toXScale="1.0"
    android:toYScale="1.0" />

<alpha
    android:duration="600"
    android:fromAlpha="0.0"
    android:toAlpha="1.0" />

</set>

Answer 2

Bounce is just an animation effect where animation ends in bouncing fashion. For this set android:interpolator value to @android:anim/bounce_interpolator. This bounce can be used with any kind animation. Following slide down example uses bounce effect.

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:fillAfter="true"
android:interpolator="@android:anim/bounce_interpolator">

<scale
    android:duration="500"
    android:fromXScale="1.0"
    android:fromYScale="0.0"
    android:toXScale="1.0"
    android:toYScale="1.0" />

Answer 3

try to add a duration :

<set xmlns:android="http://schemas.android.com/apk/res/android" >

<scale 
  android:fromXScale="1"
  android:fromYScale="0.5"
  android:interpolator="@android:anim/bounce_interpolator"
  android:pivotX="50%"
  android:pivotY="0%"
  android:toXScale="1.0"
  android:toYScale="1.0"
  android:duration="1000" />
</set>

And note that the animation set is useless if it contains only one animation.

Answer 4

If you want to have different interpolators for your animations in the animation set, set the shareInterpolator attribute to false like this:

<set xmlns:android="http://schemas.android.com/apk/res/android"
     android:shareInterpolator="false">

And then set an interpolator in each animation element. Apparently, shareInterpolator is set to true by default.