使用httpUrlConnection展示数据

package com.example.fragment;

import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;

import com.example.adapter.adapter;
import com.example.adapter.myadapter;
import com.example.bean.news;
import com.example.mode1.R;
import com.example.mode1.Show;
import com.google.gson.Gson;

import org.apache.http.protocol.HTTP;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;

/**
* Created by Dell on 2018/8/5.
*/

public class fragment extends Fragment{
@Nullable
private String spec=”http://www.xieast.com/api/news/news.php?page=1”;
private ListView list_view;

public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment, container, false);
    list_view = view.findViewById(R.id.list_view);
    return view;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    jiexi(spec);
}

private void jiexi(String spec) {
    MyAsync myAsync = new MyAsync();
    myAsync.execute(spec);//执行
}



//使用异步解析
public class MyAsync extends AsyncTask<String,Integer,String>{

    //耗时操作
    @Override
    protected String doInBackground(String... params) {
        //创建一个输入的长度
        String spec=params[0];
        //创建一个路径
        try {
            URL url = new URL(spec);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(5000);
            connection.setRequestMethod("GET");
            if(connection.getResponseCode()==200){
                InputStream inputStream = connection.getInputStream();
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                byte[] bytes = new byte[1024];
                int len=0;
                while((len=inputStream.read(bytes))!=-1){
                    bos.write(bytes,0,len);
                }
                inputStream.close();
                bos.close();
                //返回数据
                String s = bos.toString();
                return  s;

            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;

    }

    //更新UI
    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        Gson gson = new Gson();
        news news = gson.fromJson(s, news.class);
        final List<com.example.bean.news.DataBean> data = news.getData();
        myadapter myadapter = new myadapter(getActivity(),data);
        list_view.setAdapter(myadapter);

        list_view.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(getActivity(), Show.class);
                intent.putExtra("url",data.get(position).getUrl());
                startActivity(intent);
            }
        });


    }
}

}