Fragment之间跳转，再一层层返回

添加：

FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.aa_frame, new Fragment2());
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.addToBackStack(null);
ft.commit();

返回
getSupportFragmentManager().popBackStack();//suport.v4包
或getFragmentManager().popBackStack();