如何从View Pager Fragment打开片断

// 创建一个适配器类
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();
    }
}

// 在 Activity 或 Fragment 中设置 View Pager
ViewPager viewPager = findViewById(R.id.viewPager);
List<Fragment> fragments = new ArrayList<>();
fragments.add(new Fragment1());
fragments.add(new Fragment2());
fragments.add(new Fragment3());
MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager(), fragments);
viewPager.setAdapter(adapter);

// 打开指定的片断
viewPager.setCurrentItem(1); // 打开第二个片断