解决Fragment在Viepager中切换不保存状态的问题

在FragmentPagerAdapter中重写以下方法:

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            Fragment fragment = (Fragment) super.instantiateItem(container, position);
            fm.beginTransaction().show(fragment).commit();

            return fragment;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            Fragment fragment = (Fragment) object;
            fm.beginTransaction().hide(fragment).commit();
        }