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

问题

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?

回答1:

The issue was reported and fixed

回答2:

Just update library to 25.3.1 version.

来源：https://stackoverflow.com/questions/33892376/appbarlayout-setexpandedboolean-true-weird-animation-in-support-library-23-1