android 失去本地天气情况

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 + "\r\n");	                    }	                    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