How to programmatically snap to position on Recycler view with LinearSnapHelper

Question

I have implemented a horizontal recyclerView with LinearSnapHelper, to implement a UI input that selects a particular configuration. Kinda like the old school number picker/sele

Answer 1

More general solution:

1. First scroll RecyclerView to make target item visible.
2. Than, take the object of target View and use SnapHelper to determine distance for the final snap.
3. Finally scroll to target position.

NOTE: This works only because programmatically you are scrolling at the exact position & covering the missing distance by exact value using scrollBy instead of doing smooth scrolling

Code snippet:

mRecyclerView.scrollToPosition(selectedPosition);
mRecyclerView.post(() -> {
        View view = mLayoutManager.findViewByPosition(selectedPosition);
        if (view == null) {
            Log.e(WingPickerView.class.getSimpleName(), "Cant find target View for initial Snap");
            return;
        }

        int[] snapDistance = mSnapHelper.calculateDistanceToFinalSnap(mLayoutManager, view);
        if (snapDistance[0] != 0 || snapDistance[1] != 0) {
            mRecyclerView.scrollBy(snapDistance[0], snapDistance[1]);
        }
    }
});