android 得到本地天气情况

今天项目新添加了得到本地当天的温度，湿度，pm2.5的值的需求，研究了下，记下劳动成果，为码农少走弯路做贡献。

思路如下：

1.得到手机的外网ip（http://ip-api.com/json）

2.得到本地信息：省份和城市名（http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=）

3.根据省份城市名拿到城市代码（https://code.csdn.net/snippets/621277/master/blog_20150317_1_5052706/raw）

4.根据城市代码得到天气情况 （http://wthrcdn.etouch.cn/WeatherApi?citykey=）

当然天气情况里面有很多这里只拿温度，湿度和pm2.5

具体代码如下：

package com.smart.model;

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

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.http.HttpResponse;
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.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class WeatherCondition {

     public  static String getIpUrl = "http://ip-api.com/json";
     public  String getAddress = "http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=";
     public  String cityCode = "https://code.csdn.net/snippets/621277/master/blog_20150317_1_5052706/raw";
     public  String weatherUrl = "http://wthrcdn.etouch.cn/WeatherApi?citykey=";
//   http://m.weather.com.cn/mweather/101280601.shtml
     private  String locaInfo;
     public  SearchWeatherListner weatherListner;
     private String city ;

     public interface SearchWeatherListner{

         public void weatherInfo(String city,String tem,String shidu,String pm);
         public void error(Exception e);

     }

        public WeatherCondition(SearchWeatherListner weatherListner) {
        super();
        this.weatherListner = weatherListner;
    }

        public void getWebIp(final String urlStr) {
            new Thread() {
                public void run() {
                    String strForeignIP = "";
                    try {
                        URL url = new URL(urlStr);

                        BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));

                        String s = "";
                        StringBuffer sb = new StringBuffer("");
                        while ((s = br.readLine()) != null) {
                            sb.append(s + "rn");
                        }
                        br.close();

                        String webContent = "";
                        webContent = sb.toString();
                        System.out.println("webContent:"+webContent);
                        if(urlStr.equals(getIpUrl)){//1 得到ip
                            getIp(webContent);
                        }else if(urlStr.equals(cityCode)){//3 得到所有cityCode
                            getAddress(locaInfo,new JSONObject(webContent));
                        }
                        else if(urlStr.indexOf(weatherUrl)!=-1){//4 得到天气情况
                             webContent = sb.toString();
                             parserXml(webContent);
                        }
                        else{//2 得到本地信息
                            locaInfo =webContent;
                            getWebIp(cityCode);
                        }
                    } catch (Exception e) {
                        weatherListner.error(e);
                        e.printStackTrace();
                    }
                };
            }.start();

        }
        public void parserXml(String str){

            String wendu = str.substring(str.indexOf("<wendu>"), str.indexOf("</wendu>")).replace("<wendu>", "");
            String shidu = str.substring(str.indexOf("<shidu>"), str.indexOf("</shidu>")).replace("<shidu>", "");
            String pm25 = str.substring(str.indexOf("<pm25>"), str.indexOf("</pm25>")).replace("<pm25>", "");
            System.out.println("wendu:"+wendu+" shidu:"+shidu+" pm25:"+pm25);
            weatherListner.weatherInfo(city,wendu, shidu, pm25);
        }

        public void getAddress(String str,JSONObject cityJson){
            try {
                JSONObject json = new JSONObject(str);
                String country = json.getString("country");
                String province = json.getString("province");
                city = json.getString("city");
                JSONArray ja_province = cityJson.getJSONArray("城市代码");
                for(int i=0;i<ja_province.length();i++){
                    JSONObject jo_province =  ja_province.getJSONObject(i);
                    if(jo_province.getString("省").equals(province)){
                        JSONArray ja_city = jo_province.getJSONArray("市");
                        for(int j=0;j<ja_city.length();j++){
                            JSONObject jo_city = ja_city.getJSONObject(j);
                            if(jo_city.getString("市名").equals(city)){
                                String code = jo_city.getString("编码");
                                getWebIp(weatherUrl+code);
                                System.out.println("code:"+code);
                                break;
                            }

                        }

                        break;
                    }

                }

            } catch (JSONException e) {
                weatherListner.error(e);
                e.printStackTrace();
            }
        }

        public void getIp(String str){
            try {
                JSONObject json = new JSONObject(str);
                String ip = json.getString("query");
                getWebIp(getAddress+ip);
            } catch (JSONException e) {
                weatherListner.error(e);
                e.printStackTrace();
            }

        }

}

并监听WeatherCondition.SearchWeatherListner改接口