当viewpager的最后一个片段滑动时，如何从片段移动到活动？

public interface OnLastPageListener {
    void onLastPageSelected();
}

private OnLastPageListener mListener;

// 在onAttach()方法中将活动赋值给接口对象
@Override
public void onAttach(Context context) {
    super.onAttach(context);
    try {
        mListener = (OnLastPageListener) context;
    } catch (ClassCastException e) {
        throw new ClassCastException(context.toString() + " must implement OnLastPageListener");
    }
}

// 在onPageSelected()方法中判断是否是最后一个片段，并调用接口的回调方法
@Override
public void onPageSelected(int position) {
    if (position == (pagerAdapter.getCount() - 1)) {
        mListener.onLastPageSelected();
    }
}

public class MainActivity extends AppCompatActivity implements OnLastPageListener {

    // ...

    @Override
    public void onLastPageSelected() {
        // 执行从片段移动到活动的操作
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.fragment_container, new AnotherFragment());
        fragmentTransaction.commit();
    }
}