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

Answer 1

Note this variable mFirstLayout - it will be set true while viewpager callback onAttachedToWindow（such as on recyclerview），so will be not smoothScroll. You should override onAttachedToWindow to control the mFirstLayout variable. Something like this：

        @Override
        protected void onAttachedToWindow() {
            super.onAttachedToWindow();
            try {
                Field mFirstLayout = ViewPager.class.getDeclaredField("mFirstLayout");
                mFirstLayout.setAccessible(true);
                mFirstLayout.set(this, false);
                getAdapter().notifyDataSetChanged();
                setCurrentItem(getCurrentItem());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }