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.

I can do this by:

    final int height=recyclerView.getChildAt(0).getHeight();     recyclerView.smoothScrollToPosition(height);     recyclerView.postDelayed(new Runnable() {         public void run() {             recyclerView.smoothScrollToPosition(0);                         }     },200); 

But what I want is to slow down the scrolling speed, so that the complete content gets visible clearly.

Answer 1

Just to improve on the answer a little:

public class SpeedyLinearLayoutManager extends LinearLayoutManager {      private static final float MILLISECONDS_PER_INCH = 5f; //default is 25f (bigger = slower)      public SpeedyLinearLayoutManager(Context context) {         super(context);     }      public SpeedyLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {         super(context, orientation, reverseLayout);     }      public SpeedyLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {         super(context, attrs, defStyleAttr, defStyleRes);     }      @Override     public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {          final LinearSmoothScroller linearSmoothScroller = new LinearSmoothScroller(recyclerView.getContext()) {              @Override             public PointF computeScrollVectorForPosition(int targetPosition) {                 return super.computeScrollVectorForPosition(targetPosition);             }              @Override             protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {                 return MILLISECONDS_PER_INCH / displayMetrics.densityDpi;             }         };          linearSmoothScroller.setTargetPosition(position);         startSmoothScroll(linearSmoothScroller);     } } 

And then set SpeedyLayoutManager to your RecyclerView:

recyclerView.setLayoutManager(new SpeedyLinearLayoutManager(context, SpeedyLinearLayoutManager.VERTICAL, false);