android - Calling DialogFragment in Activity -

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How can I call DialogFragment in my activity . Calling it in your fragment activity ?

Here is my sample code on my Fragment Activity : 

  Private Zero ShowAlertDialog (full title, int message) {AlertDialogFragment alert = AlertDialogFragment CreateInstance (getActivity) GetString (title), getActivity (). Getstring (message); Alert.show (getChildFragmentManager (), "Alert"); }   
  alert.show (???, "alert");

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