onCreate에서는 되는데 Fragment를 상속받아서하면 오류가 나서요... 왜그런지가..

onCreateView라서 뭘 추가해줘야하는건가요?

메소드를 만들어주라고는 하는데 각 각 이런오류들이 뜨더라고요...

The method setListAdapter(ArrayAdapter<String>) is undefined for the type FriendsActivity

The method managedQuery(Uri, String[], null, String[], String) is undefined for the type FriendsActivity

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package com.example.mim;

//import java.util.ArrayList;
import java.util.ArrayList;
import java.util.List;

import android.annotation.SuppressLint;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.Contacts;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView.FindListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.ListAdapter;
import android.widget.ListView;

@SuppressLint("ValidFragment")
public class FriendsActivity extends Fragment{
 String tag = null;
 //private ArrayList<String> array_sort = new ArrayList<String>();
 
 Context mContext;
 
 public FriendsActivity(Context context){
  mContext = context;
 }
 
 @Override
 public View onCreateView(LayoutInflater inflater,
  ViewGroup container, Bundle savedInstanceState){
  View view = inflater.inflate(R.layout.activity_friends, null);
           
  Cursor cursor = getURI();
  
  // 전화번호부 가져오기   
    int end = cursor.getCount();    
    // 전화번호부의 갯수 세기  
    Log.d(tag, "end = "+end);  
    String [] name = new String[end]; 
    // 전화번호부의 이름을 저장할 배열 선언 
    int count = 0;   

    if(cursor.moveToFirst()){   
     // 컬럼명으로 컬럼 인덱스 찾기    
     int idIndex = cursor.getColumnIndex("_id");   
     do {    
      // 요소값 얻기    
      int id = cursor.getInt(idIndex);    
      name[count] = cursor.getString(1); // LogCat에 로그 남기기
      Log.d(tag, "id=" + id +", name["+count+"]=" + name[count]);
      count++;       
     } while(cursor.moveToNext() || count > end);  
    }    
      
    final ListView listView = (ListView) view.findViewById(R.id.f_list);  
    setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, name));
    listView.setItemsCanFocus(false);  
    listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
  
  return view;
 }

 @SuppressWarnings("deprecation") 
 private Cursor getURI() {  
  // 주소록 URI  
  Uri people = Contacts.CONTENT_URI;  

  // 검색할 컬럼 정하기 
  String[] projection = new String[] { Contacts._ID, Contacts.DISPLAY_NAME, Contacts.HAS_PHONE_NUMBER };  

  // 쿼리 날려서 커서 얻기
  String[] selectionArgs = null;
  String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC";  

  return managedQuery(people, projection, null, selectionArgs, sortOrder); 
 }

 
}