从ViewPager遍历Fragment

ScreenSlidePagerAdapter.java

public class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
        SparseArray<Fragment> registeredFragments = new SparseArray<Fragment>();

        private ScreenSlidePagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public android.support.v4.app.Fragment getItem(int i) {
            switch (i) {
                case 0:
                    return TodayFragment.newInstance(0);
                case 1:
                    return TodayFragment.newInstance(1);
                case 2:
                    return TodayFragment.newInstance(2);
                default:
                    return null;
            }
        }

        @Override
        public int getCount() {
            return NUM_SLIDES;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            Fragment fragment = (Fragment) super.instantiateItem(container, position);
            registeredFragments.put(position, fragment);
            return fragment;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            registeredFragments.remove(position);
            super.destroyItem(container, position, object);
        }

        public Fragment getFragmentAt(int position) {
            return registeredFragments.get(position);
        }
    }

获取ViewPager指定位置Fragment