GraduateDesign-给APP添加获取位置信息和天气预报的功能(json)

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首先，我的app需要通过网络来获取当前所在的位置。这里我找到了一个json来获取本地位置信息。

http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js //获得当前网络所在城市

返回来的信息是：

var remote_ip_info = {"ret":1,"start":-1,"end":-1,"country":"\u4e2d\u56fd","province":"\u6cb3\u5357","city":"\u6d1b\u9633","district":"","isp":"","type":"","desc":""};

返回信息中的汉字编码是gbk，这里我们需要转一下编码就能直接拿到位置信息。

country 是国家，province 是省份，city 是所在的城市。这里我就可以通过网络来获取我当前所在的位置信息。

在网上查了一下，查询天气预报都是通过查询服务器上的json来获取天气信息。

http://wthrcdn.etouch.cn/WeatherApi?city=北京 //获得北京近几天的天气情况http://www.weather.com.cn/data/cityinfo/101010100.html //101010100北京的气象ID

这是贴除了两个网址，第一个返回是xml格式，需要通过xml解析。第一个返回的信息较全，但是第二个好像也有较全的信息，但是我通过网上的链接一直是返回失败。

第一个有一个缺点，就是没有当天的天气状态（晴、多云、雨等），但是对预报来说却有。

第二个温度信息不怎么准。没有弄明白是怎么回事。

获取json需要通过http协议，这里贴上我用到到的代码：（传入json地址，直接返回字符串）

package com.lmissw.mydesignedapp;import com.lmissw.mydesignedapp.MainActivity;
import android.util.Log;
import android.widget.Toast;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;/**
* Created by ZhouWangsheng on 2018/1/9.
*/public class httpGetString { private static String urlString = null;
private static String httpUrl = null; private InputStream outStream = null;
private static String outString = null; public static String getString( String urlStr )
{
if(urlStr==null)
return null;
urlString=urlStr;
outString = null;
Thread httpThread = new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
try {
URL url = new URL(urlString);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setRequestProperty("Charset", "UTF-8"); // 设置字符集
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
int code = connection.getResponseCode(); if (code == 200) {
InputStream outStream = connection.getInputStream();
int fileLength = connection.getContentLength(); BufferedReader reader = new BufferedReader(new InputStreamReader(outStream));
StringBuilder jsonText = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
jsonText.append(line + "/n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
outStream.close();
} catch (IOException e) {
e.printStackTrace();
}
outString = jsonText.toString();
}
Log.i("Infor", "请求成功 "+fileLength);
} else {
Log.i("Infor", "请求失败");
}
} catch (ProtocolException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
Log.i("Infor", "disconnect ok");
}
}
}
});
httpThread.start();
while(httpThread.isAlive());
Log.i("Infor", "httpData:"+outString);
return outString;
}
}

下面是解析天气信息的json：

private void analysisJsonWeather( String jsonString )
{
try {
JSONTokener jsonParser = new JSONTokener( jsonString );
JSONObject json = (JSONObject)jsonParser.nextValue(); JSONObject jsonWeather = json.getJSONObject("weatherinfo");
String str = jsonWeather.getString("city");
if(str.equals(localCity)==false)
{
return;
}
str = jsonWeather.getString("temp1");
// today.temperMin= Integer.parseInt(str.replaceAll("[^-+.\\d]", ""));
str = jsonWeather.getString("temp2");
// today.temperMax= Integer.parseInt(str.replaceAll("[^-+.\\d]", ""));
// Log.i("Infor", "max min："+today.temperMax+" "+today.temperMin); today.type = jsonWeather.getString("weather");
// Log.i("Infor", "type："+today.type); } catch (JSONException e) {
e.printStackTrace();
}
}

最后附上解析xml的代码：

//通过网络获取天气信息的xml文件
String xmlText = httpGetString.getString(httpWeather+localCity); if(xmlText==null)
return false;
String str=" ";
ByteArrayInputStream stream = new ByteArrayInputStream(xmlText.getBytes());
try {
XmlPullParserFactory pullFactory=XmlPullParserFactory.newInstance();
XmlPullParser pullParser=pullFactory.newPullParser();
pullParser.setInput(stream,"UTF-8");
int entype=pullParser.getEventType(); while (entype!=XmlPullParser.END_DOCUMENT) {
String startTag=null;
String textData=null;
switch(entype) {
case XmlPullParser.START_DOCUMENT: break;
case XmlPullParser.START_TAG:
String name = pullParser.getName();
if (name.equalsIgnoreCase("city")) {
String xmlCity = pullParser.nextText();
if (xmlCity.equalsIgnoreCase(localCity) == false) // 如果后面是Text元素,即返回它的值
{
Log.i("Infor", "获取城市天气出错，当前获取的城市是:" + xmlCity);
return false;
}
} else if (name.equalsIgnoreCase("wendu")) {
today.temper = Integer.parseInt(pullParser.nextText());
} else if (name.equalsIgnoreCase("shidu")) {
/* 删除非数字部分 */
String num = pullParser.nextText().replaceAll("[^-+.\\d]", "");
today.humidity = Integer.parseInt(num); } else if (name.equalsIgnoreCase("fengxiang")) {
today.windDir = pullParser.nextText();
} else if (name.equalsIgnoreCase("updatetime")){
today.updateTime = pullParser.nextText();
}else if (name.equalsIgnoreCase("yesterday")) { int begin = xmlText.toString().indexOf('!');
String fengliString = xmlText.substring(begin+6,begin+16);
begin = fengliString.toString().indexOf('[');
int end = fengliString.toString().indexOf(']');
today.windpower = fengliString.substring(begin+1,end);
Log.i("Infor", "风力:" + today.windpower);
return true;
}
break;
case XmlPullParser.END_DOCUMENT: break;
case XmlPullParser.END_TAG: pullParser.getName(); break;
}
entype=pullParser.next();
} } catch (Exception e) {
e.printStackTrace();
} try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
} Log.i("Infor", "获得当前位置："+str);