你可以通过标签找到你的片段，但是当然你需要在添加片段时，给它添加标签。

You can find your fragment by the Tag, but of course you need to give this tag to it while adding the fragment.

首先添加一个标签片段：

First add your fragment with a tag:

        fragmentManager = getFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        SomeFragment fragment = new ManageLinksFragment();
        fragmentTransaction.add(R.id.fragment_container1,fragment, "sometag");
        fragmentTransaction.commit();

然后在活动网站上：

SomeFragment mSomeFragment = (SomeFragment) getFragmentManager().findFragmentByTag("sometag");
// now mSomeFragment.callsomething();