ValueAnimator introduces a simple way to animate a value (of a particular type, e.g. int, float, etc.).

The usual way of using it is:

1. Create a ValueAnimator that will animate a value from min to max
2. Add an [UpdateListener](<https://developer.android.com/reference/android/animation/ValueAnimator.AnimatorUpdateListener.html>) in which you will use the calculated animated value (which you can obtain with [getAnimatedValue()](<https://developer.android.com/reference/android/animation/ValueAnimator.html#getAnimatedValue()>))

There are two ways you can create the ValueAnimator:

(the example code animates a float from 20f to 40f in 250ms)

1. From xml (put it in the /res/animator/):

<animator xmlns:android="<http://schemas.android.com/apk/res/android>"
    android:duration="250"
    android:valueFrom="20"
    android:valueTo="40"
    android:valueType="floatType"/>

ValueAnimator animator = (ValueAnimator) AnimatorInflater.loadAnimator(context, 
        R.animator.example_animator);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator anim) {
        // ... use the anim.getAnimatedValue()
    }
});
// set all the other animation-related stuff you want (interpolator etc.)
animator.start();

1. From the code:

ValueAnimator animator = ValueAnimator.ofFloat(20f, 40f);
animator.setDuration(250);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator anim) {
        // use the anim.getAnimatedValue()
    }
});
// set all the other animation-related stuff you want (interpolator etc.)
animator.start();