如果选择了不同的选项卡，如何更改片段中的回收器视图的内容？

Question

我尝试使用材质设计动态创建标签，标签数量会根据arraylist的大小而变化。我只创建了一个要在所有选项卡下显示的片段类。在Fragment类布局中包含recyclerview。 recyclerview应根据选项卡进行更新。

enter code here

    arrayList.add("Greece");
    arrayList.add("Germany");
    arrayList.add("France");

    arrayList1.add("United States");
    arrayList1.add("United Kingdom");
    arrayList1.add("India");

    tabString.add("ONE");
    tabString.add("TWO");

    for(String st:arrayList)
    {
        temp.add(st);
    }




    viewPager = (ViewPager) findViewById(R.id.pager);
    setupViewPager(viewPager);

    tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.post(new Runnable() {
        @Override
        public void run() {
            tabLayout.setupWithViewPager(viewPager);
        }
    });
    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        int scrollposition=0;
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            scrollposition=position;
            if (positionOffsetPixels==0)
            {
                Bundle bundle = new Bundle();
                bundle.putInt("POSITION",position);
                ListFragment listFragment=new ListFragment();
                listFragment.setArguments(bundle);
                getSupportFragmentManager().beginTransaction().commit();
            }
        }

        @Override
        public void onPageSelected(int position) {

        }

        @Override
        public void onPageScrollStateChanged(int state) {

            if (state==viewPager.SCROLL_STATE_IDLE)
            {
                if(scrollposition==0) {
                    temp.clear();
                    for (String st : arrayList1) {
                        temp.add(st);
                        Log.v("MainActivity","aaa temp.add() : "+st);
                    }
                    ListFragment.adapterClass.notifyDataSetChanged();
                }
                else
                {
                    temp.clear();
                        for (String st : arrayList) {
                            temp.add(st);
                            Log.v("MainActivity","aaa temp.1add() : "+st);
                        }
                    ListFragment.adapterClass.notifyDataSetChanged();

                }

            }
        }
    });




}

private void setupViewPager(ViewPager viewPager) {
    adapter = new ViewPagerAdapter(getSupportFragmentManager());

    for(String cat: tabString)
    {
        adapter.addFragment(new ListFragment(), cat);
    }
    viewPager.setAdapter(adapter);
}


class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();
    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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

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