Android下Json数据解析

来源：互联网发布：网络被限制不能玩游戏编辑：程序博客网时间：2024/06/05 04:12

如从网络获取JSON 则需要创建一个工具类，该类返回一个字符串为JSON文本

package com.example.jsonapp;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import java.util.Scanner;public class UrlHtmlUtil {     public static String getHtmlJsonByUrl(String urlTemp){        URL url = null;        InputStreamReader input = null;         HttpURLConnection conn;      //  JSONObject jsonObj = null;        String a = null;        try {           url = new URL(urlTemp);           conn = (HttpURLConnection) url.openConnection();           input = new InputStreamReader(conn.getInputStream(),"utf-8");           Scanner inputStream = new Scanner(input);              StringBuffer sb = new StringBuffer();           while (inputStream.hasNext()) {                     sb.append(inputStream.nextLine());           }            a=sb.toString();           } catch (Exception e) {              System.out.println(e.getMessage());      }           return a;   } }

然后将文本转为JSONArray，用JSONArray.optJSONObject()来获取JSONObject 对象，接下来便可解析

JSONArray array=new JSONArray(json);Log.i("转换数组成功","");for(int i=0;i<array.length();i++){ JSONObject jo = array.optJSONObject(i);if(jo.getString("area").equals(cityName)){tv.setText("AQI指数:"+jo.getString("aqi")+"\n地区:"+jo.getString("area")+"\n空气质量:"+jo.getString("quality"));break;}if(i==array.length()-1){tv.setText("抱歉，也并没有找到该城市");}}

public void enJson(String json){try {JSONTokener jsonParser=new JSONTokener(json);JSONObject aqi=(JSONObject)jsonParser.nextValue();String aqistr,areastr,quastr,lvstr,timestr;aqistr=aqi.getString("aqi");areastr=aqi.getString("area");quastr=aqi.getString("quality");lvstr=levelToLevel(aqi.getString("level"));timestr=timeToTime(aqi.getString("time"));tv.setText("地区:"+areastr+"\nAQI："+aqistr+"\n空气质量："+quastr+"\n小贴士："+lvstr+"\n更新时间:"+timestr+"\n点我刷新数据");}

1 0