java – LoaderManager不接受’this’

我正在关注Android Basics的Udacity课程,需要弄清楚如何使用Loader加载数据.但是,当我使用以下行时,“this”以红色突出显示并显示以下错误：

Wrong 3rd argument type. Found 'com.example.carl.latestnews.MainActivity',required: 'android.app.LoaderManager.LoaderCallbacks<java.lang.Object>

我用谷歌搜索,堆积并尝试了我发现的建议.我已经尝试创建一个实现回调的内部类.我碰到了一堵砖墙,我坐在这里挠挠脑袋想弄清楚我错过了什么！

谁能告诉我这里我做错了什么？

提前致谢！

package com.example.carl.latestnews;


 import android.content.Context; 
 import android.os.Bundle; 
 import android.support.v4.app.LoaderManager; 
 import android.support.v4.content.AsyncTaskLoader; 
 import android.support.v4.content.Loader; 
 import android.support.v7.app.AppCompatActivity; 
 import android.view.View; 
 import android.widget.ListView; 
 import android.widget.TextView;
 import java.util.ArrayList;

 public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<ArrayList<ArticleObject>> {

     // ArticleObject is a custom object which contains a headline,date,category etc of a news article

     // URL for Guardian API including API Key
     final static String GUARDIAN_API_URL = "https://content.guardianapis.com/search?";

     // API Key
     final static String GUARDIAN_API_KEY = "test";

     // ID for LoaderManager
     final static int LOADER_MANAGER_ID = 0;


     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         // Get or initialize loader manager
         getLoaderManager().initLoader(LOADER_MANAGER_ID,null,this);

     }

     @Override
     public Loader<ArrayList<ArticleObject>> onCreateLoader(int id,Bundle args) {
         return new dataLoader(); // dataLoader() removed for easy reading
     }

     @Override
     public void onLoadFinished(Loader<ArrayList<ArticleObject>> loader,ArrayList<ArticleObject> data) {
         / UI Update Code
     }

     @Override
     public void onLoaderReset(Loader<ArrayList<ArticleObject>> loader) {
         // Reset Code
     }




 }