networkmutilpledemoforhttpurlconnection 一个综合案例

package com.example.networkmutilpledemoforhttpurlconnection;

import android.os.Handler;

import android.os.Message;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.Toast;

import com.example.networkmutilpledemoforhttpurlconnection.bean.MenuInfo;

import com.example.networkmutilpledemoforhttpurlconnection.utils.StreamTools;

import com.google.gson.Gson;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.BitSet;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private ListView lv;

    private List<MenuInfo.ResultBean> results;

    private Handler handler = new Handler(){

        @Override

        public void handleMessage(Message msg) {

            super.handleMessage(msg);

            switch (msg.what){

                case 1:

                   MenuInfo menuInfo = (MenuInfo) msg.obj;

                    results = menuInfo.getResult();

                    //设置适配器

                    lv.setAdapter(new MyBaseAdapter());

                    break;

                case 2:

                    Toast.makeText(MainActivity.this, "请求失败!", Toast.LENGTH_SHORT).show();

                    break;

            }

        }

    };

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //找控件  局部变量变全局变量快捷键 : Ctrl + Alt + F  之后敲Enter

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

        //获取网络数据

        getData();

    }

    /**

     * 获取网络数据

     * GET

     */

    private void getData() {

        new Thread(){

            @Override

            public void run() {

                super.run();

                try {

                    URL url = new URL("http://apis.juhe.cn/catering/query?lng=121.538123&lat=31.677132&key=b1cc75a5744d69064bac2549993920f6");

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

                    connection.setConnectTimeout(5 * 1000);

                    connection.setRequestMethod("GET");

                    connection.setReadTimeout(5 * 1000);

                    //服务器响应

                    int code = connection.getResponseCode();

                    if (code == HttpURLConnection.HTTP_OK) {

                        //得到服务器响应的内容数据

                        InputStream is = connection.getInputStream();

                        //数据有了

                        String json = StreamTools.readFromNetWork(is);

                        //Gson 基于JavaBean

                        Gson gson = new Gson();

                        MenuInfo menuInfo = gson.fromJson(json, MenuInfo.class);

                        //发送消息

                        Message msg = handler.obtainMessage();

                        msg.what = 1;

                        msg.obj = menuInfo;

                        handler.sendMessage(msg);

                    }else{

                        //请求数据失败 2

                        handler.sendEmptyMessage(2);

                    }

                } catch (Exception e) {

                    e.printStackTrace();

                }

            }

        }.start();

    }

    //自定义适配器

    class MyBaseAdapter extends BaseAdapter {

        @Override

        public int getCount() {

            return results != null ? results.size() : 0;

        }

        @Override

        public Object getItem(int position) {

            return results.get(position);

        }

        @Override

        public long getItemId(int position) {

            return position;

        }

        @Override

        public View getView(int position, View convertView, ViewGroup parent) {

            if (convertView == null)

                convertView = convertView.inflate(MainActivity.this, android.R.layout.simple_list_item_1, null);

            TextView text1 = (TextView) convertView.findViewById(android.R.id.text1);

            //设置文本

            text1.setText("饭店名称 : " + results.get(position).getName() + "\n饭店地址 : " +

                    "" + results.get(position).getAddress());

            return convertView;

        }

    }

}