在Android中，ViewPager片段内容首次为空

Question

在我的应用程序中，我使用ViewPager。在ViewPager片段中我使用了第三个片段，但第一个片段内容第一次是空白的，当我从第三个片段返回时，第一个片段内容即将到来。 我搜索过很多信息，但没有什么是清楚的。请问有人给出一个明确的解决方案和一个例子吗？

我的代码：

ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        //int limit = (adapter.getCount() > 1 ? adapter.getCount() - 1 : 1);
        viewPager = (ViewPager) findViewById(R.id.viewpager);
       // viewPager.setOffscreenPageLimit(limit);
        setupViewPager(viewPager);
        tabLayout = (TabLayout) findViewById(R.id.tabs);
        tabLayout.setupWithViewPager(viewPager);
        tabLayout.setTabMode(TabLayout.MODE_FIXED);
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
        tabLayout.setTabTextColors(Color.parseColor("#313B6f"), Color.parseColor("#313B6f"));
       // viewPager.setCurrentItem(2);
    }




    private void setupViewPager(final ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFrag(new Selling(), "Selling");
       adapter.addFrag(new Buying(), "Buying");
        adapter.addFrag(new Watching(), "Watching");
        //viewPager.setCurrentItem(2);

        viewPager.setAdapter(adapter);

        /*viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            Boolean first = true;
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                if (first && positionOffset == 0 && positionOffsetPixels == 0){
                    onPageSelected(0);
                    first = false;
                }
            }

            @Override
            public void onPageSelected(int position) {
                System.out.println("pageee" + position);
               }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });*/
    }


    class ViewPagerAdapter extends FragmentStatePagerAdapter {
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();



        public ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }

        public int getItemPosition(Object object) {
            return POSITION_NONE;
        }
        @Override
        public Fragment getItem(int position) {
            System.out.println("pageeeitem" + position);

            return mFragmentList.get(position);

        }

        @Override
        public int getCount() {
             return mFragmentList.size();
        }

        public void addFrag(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {

            return mFragmentTitleList.get(position);

        }


    }