如何根据ViewPager2/TabView中的片段更改android活动的标题

// 在活动中设置ViewPager2和TabLayout
ViewPager2 viewPager = findViewById(R.id.viewPager);
TabLayout tabLayout = findViewById(R.id.tabLayout);

FragmentStateAdapter adapter = new MyPagerAdapter(this);
viewPager.setAdapter(adapter);
new TabLayoutMediator(tabLayout, viewPager,
    (tab, position) -> tab.setText("Tab " + (position + 1))
).attach();

// 自定义的FragmentStateAdapter
public class MyPagerAdapter extends FragmentStateAdapter {
    private static final int NUM_FRAGMENTS = 3;

    public MyPagerAdapter(@NonNull FragmentActivity fragmentActivity) {
        super(fragmentActivity);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {
        // 返回对应位置的片段实例
        return new MyFragment();
    }

    @Override
    public int getItemCount() {
        // 返回片段的数量
        return NUM_FRAGMENTS;
    }
}

// 片段中更改活动标题
public class MyFragment extends Fragment {
    @Override
    public void onResume() {
        super.onResume();
        // 设置新的标题
        getActivity().setTitle("Fragment Title");
    }
}