Android标签名称在滑动时消失

<androidx.constraintlayout.widget.ConstraintLayout
    ...
    >

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPager"
        ...
        />

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabLayout"
        ...
        />

</androidx.constraintlayout.widget.ConstraintLayout>

ViewPager viewPager = findViewById(R.id.viewPager);
TabLayout tabLayout = findViewById(R.id.tabLayout);

viewPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
tabLayout.setupWithViewPager(viewPager);

public class MyPagerAdapter extends FragmentPagerAdapter {

    private static final int NUM_PAGES = 3; // 页面数量

    public MyPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        // 返回对应位置的Fragment
        return MyFragment.newInstance(position);
    }

    @Override
    public int getCount() {
        // 返回页面数量
        return NUM_PAGES;
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        // 返回标签名称
        return "标签 " + position;
    }
}

public class MyFragment extends Fragment {

    private static final String ARG_POSITION = "position";

    private int position;

    public static MyFragment newInstance(int position) {
        MyFragment fragment = new MyFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_POSITION, position);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        position = getArguments().getInt(ARG_POSITION);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_my, container, false);
        TextView textView = view.findViewById(R.id.textView);
        textView.setText("页面 " + position);
        return view;
    }
}

<LinearLayout
    ...
    >

    <TextView
        android:id="@+id/textView"
        ...
        />

</LinearLayout>