Android : Change ObjectAnimator interpolator midway through animation

currently I have created an animation using Android's ObjectAnimator. This is what I use to do my animations:

public class AnimatableFloat implements Animator.AnimatorListener {

private ObjectAnimator animator;

public ObjectAnimator animator() {
    return animator;
}

private AnimatableFloat(){
}

private float value;
public float getValue(){
    return value;
}

public void setValue(float value){
    this.value = value;
}

public static AnimatableFloat createStartedAnimation(TimeInterpolator i, float start, float end, int duration){
    AnimatableFloat af = new AnimatableFloat();
    ObjectAnimator oa = ObjectAnimator.ofFloat(af, "value", start, end);
    if(i != null)
        oa.setInterpolator(i);
    oa.setDuration(duration);
    oa.addListener(af);
    af.animator = oa;
    oa.start();
    return af;
}

private boolean isStarted, isEnded;

public boolean isStarted() {
    return isStarted;
}

public boolean isEnded() {
    return isEnded;
}

@Override
public void onAnimationStart(Animator animation) {
    //care about start
    isStarted = true;
}

@Override
public void onAnimationEnd(Animator animation) {
    //care about end
    isEnded = true;
}

@Override
public void onAnimationCancel(Animator animation) {

}

@Override
public void onAnimationRepeat(Animator animation) {

}

}

And I start it using the following code:

        scaleAnim = AnimatableFloat.createStartedAnimation(new AccelerateInterpolator(1f), 0, radi, (int)(CanvasView.FPS * 15f));

Now this works alright for one interpolator, but is it possible to change the interpolator mid animation? I have tried creating a new animation from the previous point, but this completely resets the animations. I have also tried the following:

        long ppt = scaleAnim.animator().getCurrentPlayTime();
        float radi = (float)Math.sqrt(Math.pow(getEndX() - getX(), 2)  + Math.pow(getEndY() - getY(), 2));
        scaleAnim = AnimatableFloat.createStartedAnimation(new AccelerateInterpolator(1f), scaleAnim.getValue(), radi, (int)(CanvasView.FPS * 25f));
        scaleAnim.animator().setCurrentPlayTime(ppt);

But this doesn't seem to work, as it doesn't seem to continue where it left out. Does anybody know a way where I can change the interpolator of the animation mid way without completely resetting the animation? Thanks.