fragment references to parent the child class reference error

 
package com.example.testfragment2; 

import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentTransaction; 
import android.view.Menu; 
import android.view.animation.Transformation; 

public class MainActivity extends FragmentActivity {

@ Override 
public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 
setContentView (R.layout.activity_main); 
/ / This line of code has been changed to an error in the parent application class object can not point to FragMent myFragment = new FragMentA (); 
/ / Error transation add went on to say myFragment error method if the Fragment object type I am speechless What is this billing ah 
Fragment myFragment = new FragMentA (); 

/ / FragmentManager manager = this.getSupportFragmentManager (); 
/ / FragmentTransaction transation = manager.beginTransaction (); 
/ / Transation.add (R.id.fragment_container, myFragment); 
this.getSupportFragmentManager () beginTransaction () add (R.id.fragment_container, myFragment);.. 
} 

@ Override 
public boolean onCreateOptionsMenu (Menu menu) {
getMenuInflater () inflate (R.menu.activity_main, menu);. 
return true; 
} 


} 

Reply:
Perversion of the reform package back
Reply:
I have given, where the package guide wrong?