RecyclerView Smooth Scroll animation

Question

I had implemented a smooth scroll animation for ViewPager using OnjectAnimator. Now, i am trying to do the same for a recyclerView but the scroll animation is abrupt. Here is my animation using ObjectAnimator for a viewpager. It produces a snap animation to demonstrate the scroll capability of the viewpager.

ObjectAnimator objectAnimator = ObjectAnimator .ofFloat(new PagerHintMovement(-10, viewPager), "progress", -1f, 1f); objectAnimator.setInterpolator(new AccelerateInterpolator()); objectAnimator.setDuration(1500); objectAnimator.setRepeatCount(1); objectAnimator.setRepeatMode(ValueAnimator.REVERSE); objectAnimator.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { Log.i(TAG, "Animation: Starting fake drag on view pager."); viewPager.beginFakeDrag(); } @Override public void onAnimationEnd(Animator animation) { Log.i(TAG, "Animation: Ending fake drag on view pager."); viewPager.endFakeDrag(); viewPager.setCurrentItem(viewPager.getCurrentItem()); } @Override public void onAnimationCancel(Animator animation) { viewPager.setCurrentItem(viewPager.getCurrentItem()); } @Override public void onAnimationRepeat(Animator animation) { if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR2) { if (animation.getInterpolator() instanceof AccelerateInterpolator) { animation.setInterpolator(new DecelerateInterpolator()); } else { animation.setInterpolator(new AccelerateInterpolator()); } } } }); objectAnimator.setStartDelay(1000); objectAnimator.start();

Any suggestions on how to achieve the same for a recyclerView ?

Is it OnjectAnimator or ObjectAnimator as stated in the question's third line? — Gourav Khunger
– Gourav Khunger, Commented May 11, 2019 at 17:37

Pawel · Accepted Answer · 2019-05-11 17:24:33Z

If you are not satisfied with default RecyclerView.smoothScrollToPosition(int) you will need to do some class overrides.

Smooth scroll in RecyclerView is triggered by calling
LayoutManager.startSmoothScroll(RecyclerView.SmoothScroller) on its current layoutManager.

You are free to override LayoutManager and provide custom RecyclerView.SmoothScroller implementation - preferably by extending RecyclerView.LinearSmoothScroller.

Thanks @Pawel. I basically want something like scrollBy (x, y). I tried translationX using ObjectAnimator but it's very abrupt.
Can you show how to override LayoutManager with custom smooth scroller implementation?

Saswata · Accepted Answer · 2019-05-11 17:31:32Z

As you mentioned you need smooth scroll you may follow the following steps:

Hide the recycler view and display a progress bar there
Create a background asynchronous task where you setup and load the recycler view
While setting data in the recycler adapter use callbacks to retrieve the data from your data model
On recycler setup complete hide the progress bar and set the recycler view visible.

This will make your recycler smoothly scrollable and decent loading.

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