Android下Json數據解析

如從網絡獲取JSON 則需要創建一個工具類，該類返回一個字符串為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;

 }


}

JSONArray array=new JSONArray(json);
                        Log.i("轉換數組成功","");
                        for(int i=0;i<array.length();i++)
                        {
                             JSONObject jo = array.optJSONObject(i);
                            if(jo.getString("area").equals(cityName))
                            {
                                tv.setText("AQI指數:"+jo.getString("aqi")+"\n地區:"+jo.getString("area")
                                        +"\n空氣質量:"+jo.getString("quality"));

                            break;}
                            if(i==array.length()-1){
                            tv.setText("抱歉，也并沒有找到該城市");
                            }
                        }

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("地區:"+areastr+"\nAQI："+aqistr+"\n空氣質量："+quastr+"\n小貼士："+lvstr+"\n更新時間:"+timestr+"\n點我刷新數據");

        }

來自： http://blog.csdn.net/wingichoy/article/details/44538363