AppBarLayout.setExpanded(boolean, true) weird animation in support library 23.1.1

Question

In my app I expand or contract the AppBarLayout on a specific event using setExpanded(boolean, true).

I've got a good result, with a snappy and fluid animation using com.android.support:design:23.1.0, then I updated to 23.1.1 and the animation got very slow and not snappy at all.

In the source code of android.support.design.widget.AppBarLayout, I located the problem in animateOffsetTo (under public static class Behavior extends HeaderBehavior<AppBarLayout>), that in the version 23.1.0 was like this:

private void animateOffsetTo(final CoordinatorLayout coordinatorLayout,     final AppBarLayout child, int offset) {    if (mAnimator == null) {        mAnimator = ViewUtils.createAnimator();        mAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR);        mAnimator.setUpdateListener(new ValueAnimatorCompat.AnimatorUpdateListener() {             @Override            public void onAnimationUpdate(ValueAnimatorCompat animator) {                setHeaderTopBottomOffset(coordinatorLayout, child,                     animator.getAnimatedIntValue());            }        });    } else {        mAnimator.cancel();    }    mAnimator.setIntValues(getTopBottomOffsetForScrollingSibling(), offset);    mAnimator.start(); } 

And in the version 23.1.1 is like this:

private void animateOffsetTo(final CoordinatorLayout coordinatorLayout,     final AppBarLayout child, final int offset) {    final int currentOffset = getTopBottomOffsetForScrollingSibling();    if (currentOffset == offset) {        if (mAnimator != null && mAnimator.isRunning()) {            mAnimator.cancel();        }        return;    }    if (mAnimator == null) {        mAnimator = ViewUtils.createAnimator();        mAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR);        mAnimator.setUpdateListener(new ValueAnimatorCompat.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimatorCompat animator) {             setHeaderTopBottomOffset(coordinatorLayout, child,                     animator.getAnimatedIntValue());            }        });    } else {        mAnimator.cancel();    }    // Set the duration based on the amount of dips we're travelling in    final float distanceDp = Math.abs(currentOffset - offset) /         coordinatorLayout.getResources().getDisplayMetrics().density;    mAnimator.setDuration(Math.round(distanceDp * 1000 / ANIMATE_OFFSET_DIPS_PER_SECOND));    mAnimator.setIntValues(currentOffset, offset);    mAnimator.start(); } 

How can I change the expand/contract animation and make is faster?

Answer 1

The issue was reported and fixed