天气预报信息获取是利用json获取的，网上有非常多资源，源码。因为上面涉及到非常多天气信息，包含湿度，出行建议等，以及加入了全部城市代码的资源包。为了练手了解json的原理。我仅获取诚笃城市的最高温，最低温，城市名字。
我的布局是通过一个button获取城市名字，最高温，最低温。main.xnl代码例如以下
本project含有2个java文件各自是WheatherLck.java和WheatherInfo.java文件。WheatherLck.java代码例如以下
package com.hiden.weatherdemo;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import org.json.JSONException;import org.json.JSONObject;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.content.Intent;import android.util.Log;import android.view.KeyEvent;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.TextView;public class WeatherLck extends Activity { // 创建三个全局的文本框对象 EditText TX_CITYNAME,TX_HEIGHT,TX_LOW; private String city_str="成都"; Button button_refresh; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main); // 获取布局中的文本框 TX_CITYNAME=(EditText)this.findViewById(R.id.tx_cityname); TX_CITYNAME.setText(city_str); TX_HEIGHT=(EditText)this.findViewById(R.id.tx_height); TX_LOW=(EditText)this.findViewById(R.id.tx_low); button_refresh=(Button)findViewById(R.id.button_refresh); button_refresh.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub if(v==button_refresh){ refresh(city_str); } } }); /************************************************************************************** * 获取http://m.weather.com.cn/data/101091106.html上面的数据 * 当中101091106为城市代码，上面我已经把城市代码做了改动，去除了空行，格式为UTF-8 * 每次仅仅是执行一次线程，然后增加主线程回收 * @param city_str * @throws JSONException * @throws Exception * @throws ClientProtocolException */ private Thread thread; private Handler handler = new Handler(){ @Override public void handleMessage(Message msg){ switch(msg.what){ case 1: JSONObject weather = (JSONObject) msg.obj; refreshUI(weather); try { thread.join(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } } }; /************************************************************************ * 在主线程中不能请求网络 * 线程没有while循环仅仅是执行一次，假设有溢出可能不能发送消息 * @param city_str */ private void requestWeather(final String city_str){ thread = new Thread(new Runnable(){ @Override public void run() { // TODO Auto-generated method stub String url="http://www.weather.com.cn/data/cityinfo/101270101.html"; HttpClient client = new DefaultHttpClient(); HttpGet httpget = new HttpGet(url); HttpResponse response; String sbuf = null; try { response = client.execute(httpget); HttpEntity httpentity = response.getEntity(); if(httpentity != null){ BufferedReader br = new BufferedReader(new InputStreamReader(httpentity.getContent(),"utf-8")); sbuf = br.readLine(); } JSONObject object = new JSONObject(sbuf); JSONObject data = (JSONObject) object.getJSONObject("weatherinfo"); //Log.i(TAG, data.toString()); Message msg = new Message(); msg.what = 1; msg.obj = data; handler.sendMessage(msg); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); thread.start(); } protected void refresh(String city_str) { requestWeather(city_str); } private void refreshUI(JSONObject jsonobject){ JSONObject jsonData = jsonobject; try { TX_CITYNAME.setText(jsonData.getString("city")); // 取得高温数据 TX_HEIGHT.setText(jsonData.getString("temp1")); // 取得低温数据 TX_LOW.setText(jsonData.getString("temp2")); }catch(Exception e){ e.printStackTrace(); } } } WheatherInfo.java代码例如以下：
package com.hiden.weatherdemo.ui;public class WeatherInfo { String city = ""; String temp1 = ""; String temp2 = "";// 椋庡悜 public String getCity() { return city; } public void setCity(String city) { this.city = city; } @Override public String toString() { return "WeatherInfo [city=" + city + ", temp1=" + temp1 + ", temp2=" + temp2 + "]"; } public String getTemp1() { return temp1; } public void setTemp1(String temp) { this.temp1 = temp; } public String getTemp2() { return temp2; } public void setTemp2(String temp) { this.temp2 = temp; }}点击button，获得到成都的最高温度和最低温度，效果图例如以下： 
当然，大家能够依据自己的需求做出更具体的效果图，比方加入未来5天的天气，定位，加入关注城市等功能。网上资源比較多，大家能够多练习练习。