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

I'm aware this thread it pretty old, but this is one of the top Google results. I've been going back and forth on how to solve this problem for quite a bit now. None of the solutions above helped me at all. However, I did find a solution that works for me.

What my setup currently looks like is a listview inside a viewpager. When you click on one of the views it creates a new page and scrolls to it. This was very snappy before, but it seems as though this is because I was calling

mViewPager.setCurrentItem(intIndex, true);

from inside my OnClickEvent. The viewpager doesn't like this for some reason, so instead, I made this function. It creates a new thread that runs a runnable on the UI thread. This runnable is what tells the ViewPager to scroll to a certain item.

public static void scrollToIndex(int index) {

    final int intIndex = index;

    //We're going to make another thread to separate ourselves from whatever
    //thread we are in 
    Thread sepThread = new Thread(new Runnable(){

        public void run()
        {
            //Then, inside that thread, run a runnable on the ui thread.
            //MyActivity.getContext() is a static function that returns the 
            //context of the activity. It's useful in a pinch.
            ((Activity)MyActivity.getContext()).runOnUiThread(new Runnable(){

                @Override
                public void run() {

                    if (mSlidingTabLayout != null)
                    {
                        //I'm using a tabstrip with this as well, make sure
                        //the tabstrip is updated, or else it won't scroll
                        //correctly
                        if(mSlidingTabLayout.getTabStripChildCount() <= intIndex)
                        mSlidingTabLayout.updateTabStrip();

                        //Inside this thread is where you call setCurrentItem
                        mViewPager.setCurrentItem(intIndex, true);

                    }

                }

            });

         }
    });


    sepThread.start();


}

I hope I have at least helped someone with this problem. Good luck!

Edit: Looking over my answer, I'm pretty sure you can just run on the ui thread, and it should work. Take that with a grain of salt though, I haven't tested it yet.