如何在FragmentPagerAdapter中获取当前项目？

public class MyPagerAdapter extends FragmentPagerAdapter {
    private List<Fragment> fragments;

    public MyPagerAdapter(FragmentManager fm, List<Fragment> fragments) {
        super(fm);
        this.fragments = fragments;
    }

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

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

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;
    private MyPagerAdapter pagerAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        List<Fragment> fragments = new ArrayList<>();
        fragments.add(new Fragment1());
        fragments.add(new Fragment2());
        fragments.add(new Fragment3());

        viewPager = findViewById(R.id.viewPager);
        pagerAdapter = new MyPagerAdapter(getSupportFragmentManager(), fragments);
        viewPager.setAdapter(pagerAdapter);

        // 获取当前项目的位置
        int currentItem = viewPager.getCurrentItem();

        // 获取当前项目的Fragment对象
        Fragment currentFragment = pagerAdapter.getItem(currentItem);
    }
}