Android下Json数据解析
jopen
9年前
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"); }