HTTPURLConnection与Handle结合使用

MainActivity

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ListView;
import com.example.dell_pc.myapplication.R;
import com.example.dell_pc.myapplication.bean.Bean1;
import com.example.dell_pc.myapplication.bean.MyAdapter;
import com.example.dell_pc.myapplication.util.HttpUtils;
import com.google.gson.Gson;
import java.util.ArrayList;
import java.util.List;
public class ListFragment extends Fragment implements View.OnClickListener {
    private Button sendBtn;
    private ListView mListView;
    private MyAdapter myAdapter;
    private List<Bean1.DataBean> data=new ArrayList<>();
    private String mUrl = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
    private Handler mHandler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what){
                case 0:
                    data.addAll((List<Bean1.DataBean>)msg.obj);
                    myAdapter.notifyDataSetChanged();
                            break;
            }
        }
    };
 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.fragment_list, container, false);
        sendBtn = v.findViewById(R.id.Send_Btn);
        sendBtn.setOnClickListener(this);
        mListView = v.findViewById(R.id.List_View);
        return v;
    }

    private void getNetData() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    String str = HttpUtils.get(mUrl);
                    Gson gson = new Gson();
                    Bean1 bean1 = gson.fromJson(str, Bean1.class);
                   mHandler.sendMessage(mHandler.obtainMessage(0, bean1.getData()));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.Send_Btn:
                getNetData();
                 myAdapter = new MyAdapter(getActivity(), data);
                mListView.setAdapter(myAdapter);
                break;
        }
    }
}

HttpUtil工具类

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpUtils {
    public static String get(String mUrl) throws IOException {
        URL url = new URL(mUrl);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.setConnectTimeout(5000);
        InputStream stream = connection.getInputStream();
        String str = getInPutStr(stream);
       return str;
    }

    private static String getInPutStr(InputStream stream) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
        StringBuffer buffer = new StringBuffer();
        String con = null;
        while ((con = reader.readLine()) != null) {
            buffer.append(con);
        }
        return buffer.toString();
    }
}

Adapter封装类

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.example.dell_pc.myapplication.R;
import java.util.List;
public class MyAdapter extends BaseAdapter {
    private Context mContext;
    private List<Bean1.DataBean> data;
    public MyAdapter(Context mContext, List<Bean1.DataBean> data) {
        this.mContext = mContext;
        this.data = data;
    }
 public void setData(List<Bean1.DataBean> data) {
        this.data = data;
        notifyDataSetChanged();
    }
    @Override
    public int getCount() {
        return data.size();
    }
  @Override
    public Object getItem(int position) {
        return null;
    }
 @Override
    public long getItemId(int position) {
        return 0;
    }
  @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder  viewHolder = null;
        if (convertView==null){
            convertView = View.inflate(mContext, R.layout.item, null);
           viewHolder = new ViewHolder();
             viewHolder.Text_Title=convertView.findViewById(R.id.Text_Title);
             convertView.setTag(viewHolder);
        }else{
            viewHolder =(ViewHolder) convertView.getTag();
        }
        viewHolder.Text_Title.setText(data.get(position).getNews_title());
        return convertView;
    }
    class ViewHolder{
        TextView Text_Title;
    }
}

Bean类

import java.util.List;
public class Bean1 {
    private int status;
    private String info;
    private List<DataBean> data;
 public int getStatus() {
        return status;
    }
 public String getInfo() {
        return info;
    }
 public List<DataBean> getData() {
        return data;
    }
 public void setStatus(int status) {
        this.status = status;
    }
  public void setInfo(String info) {
        this.info = info;
    }
   public void setData(List<DataBean> data) {
        this.data = data;
    }
public static class DataBean {

        /**
         * news_id : 13811
         * news_title : 深港澳台千里连线，嘉年华会今夏入川
         * news_summary : 6月17—20日，“2016成都深港澳台嘉年华会”(简称嘉年华会)将在成都世纪城国际会展中心举办。其主办方励展华博借力旗
         * pic_url : http://f.expoon.com/sub/news/2016/01/21/887844_230x162_0.jpg
         */
        private String news_id;
        private String news_title;
        private String news_summary;
        private String pic_url;
 public String getNews_id() {
            return news_id;
        }
public void setNews_id(String news_id) {
            this.news_id = news_id;
        }
 public String getNews_title() {
            return news_title;
        }
 public void setNews_title(String news_title) {
            this.news_title = news_title;
        }
  public String getNews_summary() {
            return news_summary;
        }
  public void setNews_summary(String news_summary) {
            this.news_summary = news_summary;
        }
 public String getPic_url() {
            return pic_url;
        }
public void setPic_url(String pic_url) {
            this.pic_url = pic_url;
        }
    }
}

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".com.bawei.fragment.ListFragment">
   <Button
        android:id="@+id/Send_Btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:text="@string/hello_blank_fragment" />
 <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/List_View"></ListView>
</LinearLayout>