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; } } }
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