SnappingLinearLayoutManager.java

public class SnappingLinearLayoutManager extends LinearLayoutManager {
        private RecyclerView.SmoothScroller smoothScroller;

        public SnappingLinearLayoutManager(Context context) {
            super(context, VERTICAL, false);
        }

        @Override
        public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state,
                                           int position) {
            if (smoothScroller == null) {
                smoothScroller = new TopSnappedSmoothScroller(recyclerView.getContext());
            }
            smoothScroller.setTargetPosition(position);
            startSmoothScroll(smoothScroller);
        }

        private class TopSnappedSmoothScroller extends LinearSmoothScroller {
            private static final float MILLISECONDS_PER_INCH = 25f; //default is 25f (bigger =
            // slower)

            public TopSnappedSmoothScroller(Context context) {
                super(context);

            }

            @Override
            public PointF computeScrollVectorForPosition(int targetPosition) {
                return SnappingLinearLayoutManager.this
                        .computeScrollVectorForPosition(targetPosition);
            }

            @Override
            protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
                return MILLISECONDS_PER_INCH / displayMetrics.densityDpi;
            }

            @Override
            protected int getVerticalSnapPreference() {
                return SNAP_TO_START;
            }
        }
    }