使用嵌套的viewpager将数据从一个片段发送到另一个片段

<androidx.viewpager.widget.ViewPager
    android:id="@+id/parentViewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

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

    public ParentPagerAdapter(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();
    }
}

List<Fragment> childFragments = new ArrayList<>();
childFragments.add(new FirstChildFragment());
childFragments.add(new SecondChildFragment());

ParentPagerAdapter parentPagerAdapter = new ParentPagerAdapter(getChildFragmentManager(), childFragments);
ViewPager parentViewPager = findViewById(R.id.parentViewPager);
parentViewPager.setAdapter(parentPagerAdapter);

public interface DataListener {
    void onDataReceived(String data);
}

public class FirstChildFragment extends Fragment implements DataListener {
    // ...

    @Override
    public void onDataReceived(String data) {
        // 处理接收到的数据
    }

    private void sendDataToParent(String data) {
        ParentPagerAdapter parentPagerAdapter = (ParentPagerAdapter) getParentFragment().getViewPager().getAdapter();
        SecondChildFragment secondChildFragment = (SecondChildFragment) parentPagerAdapter.getItem(1);
        secondChildFragment.onDataReceived(data);
    }
}

public class SecondChildFragment extends Fragment implements DataListener {
    // ...

    @Override
    public void onDataReceived(String data) {
        // 处理接收到的数据
    }
}