ViewPager setCurrentItem(pageId, true) does NOT smoothscroll

Question

I am compiling on SDK 4.03, Samsung Infuse Android 2.2, Support Library for Android 4, and using ViewPager in my app, actual swipe works fine, but when I do

viewPager.setCurrentItem(id); // , or viewPager.setCurrentItem(id, true);   

It does not smooth scroll, but switches views instantly. Although the documentation clearly states that that is the purpose setting the second argument to true. Whats up with this?

Answer 1

I've fixed this by creating a MyViewPager that overrides the ViewPager.mScroller using reflection.

public class MyViewPager extends ViewPager {      public MyViewPager(Context context, AttributeSet attrs) {         super(context, attrs);         setMyScroller();     }      private void setMyScroller() {         try {             Class<?> viewpager = ViewPager.class;             Field scroller = viewpager.getDeclaredField("mScroller");             scroller.setAccessible(true);             scroller.set(this, new MyScroller(getContext()));         } catch (Exception e) {             e.printStackTrace();         }     }      public class MyScroller extends Scroller {         public MyScroller(Context context) {             super(context, new DecelerateInterpolator());         }          @Override         public void startScroll(int startX, int startY, int dx, int dy, int duration) {             super.startScroll(startX, startY, dx, dy, 1000 /*1 secs*/);         }     } }