package com.example.myapplication;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ListView;

import org.json.JSONArray;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.*;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.*;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
private ListView listView;
    private String url = "http://www.imooc.com/api/teacher?type=4&num=30";
    private List<NewsBean> newsBeenList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = (ListView) findViewById(R.id.listView);


        MyAsyncTask myAsyncTask = new MyAsyncTask();
myAsyncTask.execute(url);


    }

    private List<NewsBean> getJsonData(String s){
List<NewsBean> listNews = new ArrayList<>();
        NewsBean newsBean;
        try {
            String jsonString =readStream(new URL(s).openStream());

            Log.i(TAG, "getJsonData: "+jsonString);

            JSONObject jsonObject = new JSONObject(jsonString);
            JSONArray jsonArray = jsonObject.getJSONArray("data");
            for(int i=0;i<jsonArray.length();i++){
                jsonObject = jsonArray.getJSONObject(i);
                newsBean = new NewsBean();
                newsBean.newsIconUrl= jsonObject.getString("picSmall");
                newsBean.title = jsonObject.getString("name");
                newsBean.content = jsonObject.getString("description");
                listNews.add(newsBean);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return listNews;
    }

    public  String readStream(InputStream is){
        InputStreamReader isr;
        String result="";


        try {
            String temp="";
            isr = new InputStreamReader(is,"utf-8");
            BufferedReader bufferedInputStream = new BufferedReader(isr);
            while((temp=bufferedInputStream.readLine())!=null){
result+=temp;
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;


    }

    class MyAsyncTask extends AsyncTask<String,Void,List<NewsBean>>{


        @Override
        protected List<NewsBean> doInBackground(String... strings) {
            return getJsonData(strings[0]);
        }

        @Override
        protected void onPostExecute(List<NewsBean> newsBeen) {
            super.onPostExecute(newsBeen);
            newsBeenList = newsBeen;
            NewsAdapter newsAdapter = new NewsAdapter(newsBeenList,MainActivity.this);
            listView.setAdapter(newsAdapter);


        }
    }
}