Android 和 FragmentManager

Question

使用我的 Fragment 类中的这段代码:

FragmentManager fm = getFragmentManager();

我得到了空值。为什么？我在android doc中找到了那句话:

Note that this will be non-null slightly before getActivity(), during the time from when the fragment is placed in a FragmentTransaction until it is committed and attached to its activity.

但是我完全不明白。怎么做才能不让那个空？

Answer 1

您的 Activity 应该是 FragmentActivity 的一个实例并从这里调用 getFragmentManager()