How can i control the scrolling speed of recyclerView.smoothScrollToPosition(position)

Question

I have a recycler view... and i want a smooth scrolldown and then scrollup to it programatically to show the complete content in it to user .... And i m able to do this by<

Answer 1

I found an answer!

You need to make a custom class extending [LinearLayoutManager][1] and then override the [smoothScrollToPosition][1] method. Inside, you need to create a new [LinearSmoothScroller][1] and override its calculateSpeedPerPixel method Then use that LinearSmoothScroller to complete the scroll.

Here is my example :

public class CustomLinearLayoutManager extends LinearLayoutManager{
        @Override
        public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
            final LinearSmoothScroller linearSmoothScroller =
                    new LinearSmoothScroller(recyclerView.getContext()) {
                        private static final float MILLISECONDS_PER_INCH = 100f;

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

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

Assign this CustomLinearLayoutManager to your RecyclerView and you should be good to go. Let me know if I was unclear in anything. I'll be happy to help.