如何更改所选标签的文本大小

Question

使用样式，XML更改了选项卡中的字体大小，但是所选的选项卡仍然是旧大小。也许我什至不正确地创建了它们。下面是创建标签的代码。也许还有另一种创建它们的方法？在每个选项卡中，我都存储了recyclerView。

MainActivity

sectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());
        viewPager = findViewById(R.id.view_pager);
        viewPager.setAdapter(sectionsPagerAdapter);
        TabLayout tabs = findViewById(R.id.tabs);
        tabs.setupWithViewPager(viewPager);

PageViewModel

public class PageViewModel extends ViewModel {

    private MutableLiveData<Integer> mIndex = new MutableLiveData<>();
    private LiveData<Integer> mText = Transformations.map(mIndex, new Function<Integer, Integer>() {
        @Override
        public Integer apply(Integer input) {
            return input;
        }
    });



    public void setIndex(int index) {
        mIndex.setValue(index);
    }

    public LiveData<Integer> getText() {
        return mText;
    }
}

SectionPagerAdapter

public class SectionsPagerAdapter extends FragmentPagerAdapter {
    @StringRes
    private static final int[] TAB_TITLES = new int[]{R.string.tab_text_1, R.string.tab_text_2,R.string.tab_text_4, R.string.tab_text_3};
    private final Context mContext;
    public SectionsPagerAdapter(Context context, FragmentManager fm) {
        super(fm);
        mContext = context;
    }

    @Override
    public Fragment getItem(int position) {
        return PlaceholderFragment.newInstance(position + 1);
    }



    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return mContext.getResources().getString(TAB_TITLES[position]);
    }

    @Override
    public int getCount() {
        return 4;
    }
}

PlaceHolderFragment

 public static PlaceholderFragment newInstance(int index) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle bundle = new Bundle();
        bundle.putInt(ARG_SECTION_NUMBER, index);
        fragment.setArguments(bundle);

        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        pageViewModel = ViewModelProviders.of(this).get(PageViewModel.class);

        int index = 1;
        if (getArguments() != null) {
            index = getArguments().getInt(ARG_SECTION_NUMBER);
        }
        pageViewModel.setIndex(index);


        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getContext());
        editor = sharedPreferences.edit();





    }





    @Override
    public View onCreateView(
            @NonNull LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_main, container, false);

        recyclerView = root.findViewById(R.id.recyclerOrders);
        recyclerView.setHasFixedSize(true);


        return root;
    }