在Android中，添加一个片段并在一次操作中释放回堆栈片段

如何在一个操作下添加一个片段并释放Android中的所有后台堆栈

我试过：

getSupportFragmentManager().popBackStack(null,FragmentManager.POP_BACK_STACK_INCLUSIVE);

然后添加我的新片段：

FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
    fragmentTransaction.setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left);
    fragmentTransaction.replace(R.id.content_frame, fragment);
    fragmentTransaction.commitAllowingStateLoss(); 
    // or 
    fragmentTransaction.commit(); // i tried both of them

但我得到：

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

---

使用ft.addToBackStack（null）避免碎片回叠

例如：-

SignUpAsFragment signUpAsFragment=new SignUpAsFragment();
    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    ft.replace(R.id.user_signUp_frag_container,signUpAsFragment); // container is your FrameLayout container
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
    ft.addToBackStack(null);
    ft.commit();