Android导航:如何像堆栈一样从父母导航到孩子，再导航到孩子的孩子再导航回来

ParentFragment parentFragment = new ParentFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.container, parentFragment);
transaction.addToBackStack(null);
transaction.commit();

ChildFragment childFragment = new ChildFragment();
FragmentManager fragmentManager = getParentFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.container, childFragment);
transaction.addToBackStack(null);
transaction.commit();

GrandchildFragment grandchildFragment = new GrandchildFragment();
FragmentManager fragmentManager = getChildFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.container, grandchildFragment);
transaction.addToBackStack(null);
transaction.commit();

FragmentManager fragmentManager = getChildFragmentManager();
fragmentManager.popBackStack();