ViewPager + Adapter in Fragment => laggy swiping

Question

I have a ViewPager with some fragments. Each fragment has a ListView in a SlidingDrawer (=invisible before swiping) with an Arra

Answer 1

I had a similar problem... I used listeners. Still, when you swipe two pages back to back it was laggy... I did something like this that improved the experience....

viewpager.setOnPageChangeListener(new OnPageChangeListener() {
    int positionCurrent;
    boolean dontLoadList;
    @Override
    public void onPageScrollStateChanged(int state) {   
        if(state == 0){ // the viewpager is idle as swipping ended
                new Handler().postDelayed(new Runnable() {
                    public void run() {
                        if(!dontLoadList){
                        //async thread code to execute loading the list... 
                        }
                    }
                },200);
            }
        }
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        positionCurrent = position; 
        if( positionOffset == 0 && positionOffsetPixels == 0 ) // the offset is zero when the swiping ends{
            dontLoadList = false;
        }
        else
            dontLoadList = true; // To avoid loading content for list after swiping the pager.
    }

}

If you take a few milli seconds to load the list that comes as supplement to the viewpager, its ok in terms of UX rather than giving a bad swiping experience... So, the idea is to wait for 400ms in the thread before loading the list and making sure that you actually dont load content when the user is trying to swipe fast to see the viewpager content...