ViewPager.setOffscreenPageLimit(0) doesn't work as expected

Question

The fragments I use in my ViewPager instance are quite resource intensive, so I'd only like to load one at a time. When I try the following:

mViewPager.setOffscreenPageLimit(0);
mViewPager.setAdapter(mPagerAdapter);

My FragmentStatePagerAdapter.getItem(int position) override function is called 3 times, which is what happens when I call mViewPager.setOffscreenPageLimit(1). I would expect it to only be called once, because I specified 0 offscreen pages.

I believe I'm calling everything correctly, because if I call mViewPager.setOffscreenPageLimit(2), FragmentStatePagerAdapter.getItem(int position) is called 5 times as I would expect.

Does ViewPager require a minimum of 1 offscreen pages, or am I doing something wrong here?

Answer 1

The best way that I found was setUserVisibleHint
add this to your fragment

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if (isVisibleToUser) {
        // load data here
    }else{
       // fragment is no longer visible
    }
}