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?