android JSON解析数据 android解析天气预报

概要

笔者近期做到对天气预报json数据解析，在此小记。

天气预报接口：http://wthrcdn.etouch.cn/weather_mini?citykey=101200101

json数据如下：

{
 "desc": "ok",
 "status": 1000,
 "data": {
 "wendu": "14",
 "ganmao": "天气转凉，空气湿度较大，较易发生感冒，体质较弱的朋友请注意适当防护。",
 "forecast": [
  {
  "fengxiang": "无持续风向",
  "fengli": "微风级",
  "high": "高温 17℃",
  "type": "小雨",
  "low": "低温 10℃",
  "date": "30日星期四"
  },
  {
  "fengxiang": "无持续风向",
  "fengli": "微风级",
  "high": "高温 18℃",
  "type": "多云",
  "low": "低温 7℃",
  "date": "31日星期五"
  },
  {
  "fengxiang": "无持续风向",
  "fengli": "微风级",
  "high": "高温 20℃",
  "type": "晴",
  "low": "低温 8℃",
  "date": "1日星期六"
  },
  {
  "fengxiang": "无持续风向",
  "fengli": "微风级",
  "high": "高温 23℃",
  "type": "晴",
  "low": "低温 10℃",
  "date": "2日星期天"
  },
  {
  "fengxiang": "无持续风向",
  "fengli": "微风级",
  "high": "高温 23℃",
  "type": "多云",
  "low": "低温 12℃",
  "date": "3日星期一"
  }
 ],
 "yesterday": {
  "fl": "微风",
  "fx": "无持续风向",
  "high": "高温 21℃",
  "type": "阴",
  "low": "低温 12℃",
  "date": "29日星期三"
 },
 "aqi": "114",
 "city": "武汉"
 }
}

最终解析效果：

解析概述

1、首先，接到的整个数据可以转化为jsonobject对象。
2、通过整个数据的jsonobject对象获取到data中的数据，也是一个jsonobject对象。在data中就可以获取到此时温度，以及城市等信息。
3、通过data的jsonobject对象可以获取到forecast中的数据，forecast中的数据则是一个jsonarray对象。
4、通过forecast的jsonarray对象可以获取到近几天的天气信息，每一条为一个jsonobject对象。

代码

方便起见，笔者使用了volley框架，读者新建项目需要在build.gradle的dependencies中添加如下:

compile 'eu.the4thfloor.volley:com.android.volley:2015.05.28'

mainactivity.java:

package com.example.double2.jsontext;

import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import android.util.log;
import android.widget.textview;
import com.android.volley.requestqueue;
import com.android.volley.response;
import com.android.volley.volleyerror;
import com.android.volley.toolbox.jsonobjectrequest;
import com.android.volley.toolbox.volley;
import org.json.jsonarray;
import org.json.jsonexception;
import org.json.jsonobject;

public class mainactivity extends appcompatactivity {

 private textview tvmain;
 private requestqueue mrequestqueue;

 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main);

 initview();
 }

 private void initview() {
 tvmain = (textview) findviewbyid(r.id.tv_main);
 mrequestqueue = volley.newrequestqueue(this);

 jsonobjectrequest mjsonobjectrequest = new jsonobjectrequest(
  "http://wthrcdn.etouch.cn/weather_mini?citykey=101200101",
  null,
  new response.listener<jsonobject>() {
   @override
   public void onresponse(jsonobject response) {
   try {
    jsonobject data = new jsonobject(response.getstring("data"));
    jsonarray forecast = data.getjsonarray("forecast");
    jsonobject todayweather = forecast.getjsonobject(0);

    string wendu = data.getstring("wendu") + "\n";
    string ganmao = data.getstring("ganmao") + "\n";
    string high = todayweather.getstring("high") + "\n";
    string low = todayweather.getstring("low") + "\n";
    string date = todayweather.getstring("date") + "\n";
    string city = data.getstring("city") + "\n";

    tvmain.settext(wendu + ganmao + high + low + date+city);
   } catch (jsonexception e) {
    e.printstacktrace();
   }
   }
  }, new response.errorlistener() {
  @override
  public void onerrorresponse(volleyerror error) {
  log.e("tag", error.getmessage(), error);
  }
 });

 mrequestqueue.add(mjsonobjectrequest);
 }

}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<linearlayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:padding="10dp"
 >

 <textview
 android:id="@+id/tv_main"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="hello world!"
 />

</linearlayout>

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