從 Activity 呼叫 Fragment 的方法
===
我是利用 Tag 來取得 Fragment

DpContactGroupFragment contactGroupFrag = (DpContactGroupFragment) getSupportFragmentManager().findFragmentByTag("Contact Group Fragment");
contactGroupFrag.reloadCellsDataAfterFinishGroupDispatching();

## Ref.
[Calling a Fragment method from a parent Activity](https://stackoverflow.com/questions/10903077/calling-a-fragment-method-from-a-parent-activity)

###### tags: `Fragment`