Question

I have a problem with pageviewer. I want to my page scroll every two seconds. I try something like this:

handler.postDelayed(new Runnable() {
    public void run() {

        viewPager.setCurrentItem(viewPager.getCurrentItem()+1, true);

    } 
},2000);

But it works only when I start activity. If i put this code to public void onPageSelected(int page) it works but I want to do when I click and manually scroll page I want to stop this handler but it doeasn’t work. How I can do that?

Answer 1

You should define your Runnable and Handler like this:

private boolean pagerMoved = false;
private static final long ANIM_VIEWPAGER_DELAY = 2000;

private Handler h = new Handler();
    private Runnable animateViewPager = new Runnable() {
        public void run() {
            if (!pagerMoved) {
                viewPager.setCurrentItem(viewPager.getCurrentItem()+1, true);
                h.postDelayed(animationFrame, ANIM_VIEWPAGER_DELAY);
            }
        }
    };

Make sure that you setup and tear down in your onPause & onResume methods

@Override
    public void onPause() {
        super.onPause();
        if (h != null) {
            h.removeCallbacks(animateViewPager);
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        h.postDelayed(animateViewPager, ANIM_VIEWPAGER_DELAY);
    }

Finally, you’ll need to listen for a touch event on your viewpager so that you can set pagerMoved to true (which will then stop further automatic page transitions).