GraduateDesign-給APP添加獲取位置信息和天氣預報的功能(json)
阿新 • • 發佈：2018-01-10
當前位置 失敗 rac reader adl country oca import 功能
首先，我的app需要通過網絡來獲取當前所在的位置。這裏我找到了一個json來獲取本地位置信息。
http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js //獲得當前網絡所在城市
返回來的信息是：
var remote_ip_info = {"ret":1,"start":-1,"end":-1,"country":"\u4e2d\u56fd","province":"\u6cb3\u5357","city":"\u6d1b\u9633","district":"","isp":"","type":"","desc":""};
返回信息中的漢字編碼是gbk，這裏我們需要轉一下編碼就能直接拿到位置信息。
country 是 國家，province 是 省份，city 是所在的城市。這裏我就可以通過網絡來獲取我當前所在的位置信息。
在網上查了一下，查詢天氣預報都是通過查詢服務器上的json來獲取天氣信息。
http://wthrcdn.etouch.cn/WeatherApi?city=北京 //獲得北京近幾天的天氣情況 http://www.weather.com.cn/data/cityinfo/101010100.html //101010100北京的氣象ID
這是貼除了兩個網址，第一個返回是xml格式，需要通過xml解析。第一個返回的信息較全，但是第二個好像也有較全的信息，但是我通過網上的鏈接一直是返回失敗。
第一個有一個缺點，就是沒有當天的天氣狀態（晴、多雲、雨等），但是對預報來說卻有。
第二個溫度信息不怎麽準。沒有弄明白是怎麽回事。
獲取json需要通過http協議，這裏貼上我用到到的代碼：（傳入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"); // 設置字符集
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", "請求成功 "+fileLength);
} else {
Log.i("Infor", "請求失敗");
}
} 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;
}
}
下面是解析天氣信息的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();
}
}
最後附上解析xml的代碼：
//通過網絡獲取天氣信息的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) // 如果後面是Text元素,即返回它的值
{
Log.i("Infor", "獲取城市天氣出錯，當前獲取的城市是:" + xmlCity);
return false;
}
} else if (name.equalsIgnoreCase("wendu")) {
today.temper = Integer.parseInt(pullParser.nextText());
} else if (name.equalsIgnoreCase("shidu")) {
/* 刪除非數字部分 */
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", "風力:" + 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", "獲得當前位置："+str);
GraduateDesign-給APP添加獲取位置信息和天氣預報的功能(json)