试图从一个片段调用一个方法，在我的活动。我想片段给该方法的数据和获取数据的方法返回的时候。欲实现类似于上一个静态方法调用，但不使用静态的，因为它建立在活动的问题。

Trying to call a method in my activity from a fragment. I want the fragment to give the method data and to get the data when the method return. I want to achieve similar to call on a static method, but without the use of static because it create problems in the activity.

新来的碎片，所以我需要一个简单和教学的解释！

New to fragments so I need an easy and pedagogic explanation!

谢谢！

推荐答案

从片段activty：

((YourActivityClassName)getActivity()).yourPublicMethod();

从活动片段：

FragmentManager fm = getSupportFragmentManager();

//if you added fragment via layout xml
YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentById(R.id.your_fragment_id);
fragment.yourPublicMethod();

如果您添加通过code片段，并使用了标记字符串时，您添加的片段，使用 findFragmentByTag 来代替：

If you added fragment via code and used a tag string when you added your fragment, use findFragmentByTag instead:

YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentByTag("yourTag");