android – 如何等待片段被删除

我有一个带有动态片段的活动.我需要在删除一个片段后运行一些代码,但是remove(myFragment).commit()是异步执行的,我不知道该片段何时被删除.这是我的代码：

final FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.remove(myFragment).commit();
//wait until the fragment is removed and then execute rest of my code

从文档：

public abstract int commit ()

Schedules a commit of this transaction. The commit does not happen
immediately; it will be scheduled as work on the main thread to be
done the next time that thread is ready.

如果您使用片段的onDetach方法来调用活动并告诉它已完成,该怎么办？

class MyFrag extends Fragment {

    private Activity act;

    @Override
    public void onAttach(Activity activity) {
        act = activity;
    }

    @Override
    public void onDetatch() {
        act.fragGone();
    }
}

在活动中：

public fragGone() {
    //do something, update a boolean, refresh view, etc.
}