HttpURLConnection+Handle

package com.bw.asus.myapplication;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.Toast;
import com.bw.asus.myapplication.adapter.MyAdapter;
import com.bw.asus.myapplication.bean.Data;
import com.bw.asus.myapplication.bean.JsonData;
import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
public class Fragment_01 extends Fragment {
    String urlString = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
    String urlBitmap = "https://img-my.youkuaiyun.com/uploads/201407/26/1406383265_8550.jpg";
    private ListView listView;
    private ArrayList<Data> data;

    @SuppressLint("HandlerLeak")
    Handler handler = new Handler(){



        @Override
        public void handleMessage(Message msg) {

            super.handleMessage(msg);
            if(msg.what==1){
                data = (ArrayList<Data>) msg.obj;

                MyAdapter myAdapter = new MyAdapter(data,getActivity());
                listView.setAdapter(myAdapter);
            }
        }
    };
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.frag_01,container,false);

        listView = view.findViewById(R.id.frag_01_listView);

        new Thread(){
            @Override
            public void run() {
                super.run();

                try {
                    URL url = new URL(urlString);

                    HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

                    int code = httpURLConnection.getResponseCode();
                    if(code==200   ){
                        InputStream inputStream = httpURLConnection.getInputStream();
                        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                        String temp = "";
                        StringBuilder builder = new StringBuilder();
                        while ((temp=reader.readLine()) != null){
                            builder.append(temp);
                        }
                        Gson gson = new Gson();
                        JsonData jsonData = gson.fromJson(builder.toString(), JsonData.class);
                        ArrayList<Data> data = jsonData.getData();

                        Log.e("++++++++++++++++++","++++++++++++++"+data.toString());
                        Message message = handler.obtainMessage();
                        message.what = 1;
                        message.obj = data;
                        handler.sendMessage(message);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }.start();
        return view;
    }
}