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：?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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